89C51RB2

INTEGRATED CIRCUITS 89C51RB2/89C51RC2/89C51RD2 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM Preliminary specification IC28 Data Handbook 1999 Sep 23 Philips Semiconductors Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 DESCRIPTION The 89C51RB2/RC2/RD2 device contains a non-volatile 16kB/32kB/64kB Flash program memory that is both parallel programmable and serial In-System and In-Application Programmable. In-System Programming (ISP) allows the user to download new code while the microcontroller sits in the application. In-Application Programming (IAP) means that the microcontroller fetches new program code and reprograms itself while in the system. This allows for remote programming over a modem link. A default serial loader (boot loader) program in ROM allows serial In-System programming of the Flash memory via the UART without the need for a loader in the Flash code. For In-Application Programming, the user program erases and reprograms the Flash memory by use of standard routines contained in ROM. This device executes one machine cycle in 6 clock cycles, hence providing twice the speed of a conventional 80C51. An OTP configuration bit lets the user select conventional 12 clock timing if desired. This device is a Single-Chip 8-Bit Microcontroller manufactured in advanced CMOS process and is a derivative of the 80C51 microcontroller family. The instruction set is 100% compatible with the 80C51 instruction set. The device also has four 8-bit I/O ports, three 16-bit timer/event counters, a multi-source, four-priority-level, nested interrupt structure, an enhanced UART and on-chip oscillator and timing circuits. The added features of the P89C51RB2/RC2/RD2 makes it a powerful microcontroller for applications that require pulse width modulation, high-speed I/O and up/down counting capabilities such as motor control. FEATURES • 80C51 Central Processing Unit • On-chip Flash Program Memory with In-System Programming (ISP) and In-Application Programming (IAP) capability • Boot ROM contains low level Flash programming routines for downloading via the UART • Can be programmed by the end-user application (IAP) • 6 clocks per machine cycle operation (standard) • 12 clocks per machine cycle operation (optional) • Speed up to 20 MHz with 6 clock cycles per machine cycle (40 MHz equivalent performance); up to 33 MHz with 12 clocks per machine cycle • Fully static operation • RAM expandable externally to 64 kB • 4 level priority interrupt • 8 interrupt sources • Four 8-bit I/O ports • Full-duplex enhanced UART – Framing error detection – Automatic address recognition • Power control modes – Clock can be stopped and resumed – Idle mode – Power down mode • Programmable clock out • Second DPTR register • Asynchronous port reset • Low EMI (inhibit ALE) • Programmable Counter Array (PCA) – PWM – Capture/compare 1999 Sep 23 2 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 ORDERING INFORMATION PHILIPS (EXCEPT NORTH AMERICA) PART ORDER NUMBER PART MARKING 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 P89C51RB2HBP P89C51RB2HFP P89C51RB2HBA P89C51RB2HFA P89C51RB2HBB P89C51RB2HFB P89C51RC2HBP P89C51RC2HFP P89C51RC2HBA P89C51RC2HFA P89C51RC2HBB P89C51RC2HFB P89C51RD2HBP P89C51RD2HFP P89C51RD2HBA P89C51RD2HFA P89C51RD2HBB P89C51RD2HFB PHILIPS NORTH AMERICA PART ORDER NUMBER P89C51RB2BP P89C51RB2FP P89C51RB2BA P89C51RB2FA P89C51RB2BB P89C51RB2FB P89C51RC2BP P89C51RC2FP P89C51RC2BA P89C51RC2FA P89C51RC2BB P89C51RC2FB P89C51RD2BP P89C51RD2FP P89C51RD2BA P89C51RD2FA P89C51RD2BB P89C51RD2FB MEMORY FLASH RAM TEMPERATURE RANGE (°C) AND PACKAGE 0 to +70, PDIP –40 to +85, PDIP 0 to +70, PLCC –40 to +85, PLCC 0 to +70, PQFP –40 to +85, PQFP 0 to +70, PDIP –40 to +85, PDIP 0 to +70, PLCC –40 to +85, PLCC 0 to +70, PQFP –40 to +85, PQFP 0 to +70, PDIP –40 to +85, PDIP 0 to +70, PLCC –40 to +85, PLCC 0 to +70, PQFP –40 to +85, PQFP VOLTAGE RANGE FREQUENCY (MHz) 6 CLOCK MODE 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 0 to 20 MHz 12 CLOCK MODE 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz 0 to 33 MHz DWG # 16 kB 16 kB 16 kB 16 kB 16 kB 16 kB 32 kB 32 kB 32 kB 32 kB 32 kB 32 kB 64 kB 64 kB 64 kB 64 kB 64 kB 64 kB 512 B 512 B 512 B 512 B 512 B 512 B 512 B 512 B 512 B 512 B 512 B 512 B 1 kB 1 kB 1 kB 1 kB 1 kB 1 kB 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V 4.5–5.5 V SOT129-1 SOT129-1 SOT187-2 SOT187-2 SOT307-2 SOT307-2 SOT129-1 SOT129-1 SOT187-2 SOT187-2 SOT307-2 SOT307-2 SOT129-1 SOT129-1 SOT187-2 SOT187-2 SOT307-2 SOT307-2 1999 Sep 23 3 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 BLOCK DIAGRAM P0.0–P0.7 P2.0–P2.7 PORT 0 DRIVERS VCC VSS RAM ADDR REGISTER RAM PORT 0 LATCH PORT 2 DRIVERS PORT 2 LATCH FLASH 8 B REGISTER STACK POINTER ACC TMP2 TMP1 PROGRAM ADDRESS REGISTER ALU SFRs TIMERS PSW P.C.A. 8 BUFFER PC INCREMENTER 16 PROGRAM COUNTER PSEN ALE EAVPP RST PD TIMING AND CONTROL INSTRUCTION REGISTER DPTR’S MULTIPLE PORT 1 LATCH PORT 3 LATCH OSCILLATOR PORT 1 DRIVERS XTAL1 XTAL2 P1.0–P1.7 PORT 3 DRIVERS P3.0–P3.7 SU01065 1999 Sep 23 4 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 LOGIC SYMBOL VCC XTAL1 PORT 0 ADDRESS AND DATA BUS VSS Plastic Leaded Chip Carrier 6 1 40 7 39 LCC XTAL2 T2 T2EX PORT 1 RST EA/VPP PSEN SECONDARY FUNCTIONS ALE/PROG RxD TxD INT0 INT1 T0 T1 WR RD 17 29 18 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Function NIC* P1.0/T2 P1.1/T2EX P1.2/ECI P1.3/CEX0 P1.4/CEX1 P1.5/CEX2 P1.6/CEX3 P1.7/CEX4 RST P3.0/RxD NIC* P3.1/TxD P3.2/INT0 P3.3/INT1 Pin 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Function P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD XTAL2 XTAL1 VSS NIC* P2.0/A8 P2.1/A9 P2.2/A10 P2.3/A11 P2.4/A12 P2.5/A13 P2.6/A14 28 Pin 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Function P2.7/A15 PSEN ALE/PROG NIC* EA/VPP P0.7/AD7 P0.6/AD6 P0.5/AD5 P0.4/AD4 P0.3/AD3 P0.2/AD2 P0.1/AD1 P0.0/AD0 VCC PORT 3 PORT 2 ADDRESS BUS SU01302 PINNING Plastic Dual In-Line Package * NO INTERNAL CONNECTION SU00023 Plastic Quad Flat Pack T2/P1.0 1 T2EX/P1.1 2 ECI/P1.2 3 CEX0/P1.3 4 CEX1/P1.4 5 CEX2/P1.5 6 CEX3/P1.6 7 CEX4/P1.7 8 RST 9 RxD/P3.0 10 TxD/P3.1 11 INT0/P3.2 12 INT1/P3.3 13 T0/P3.4 14 T1/P3.5 15 WR/P3.6 16 RD/P3.7 17 XTAL2 18 XTAL1 19 VSS 20 DUAL IN-LINE PACKAGE 40 VCC 39 P0.0/AD0 38 P0.1/AD1 37 P0.2/AD2 36 P0.3/AD3 35 P0.4/AD4 34 P0.5/AD5 33 P0.6/AD6 32 P0.7/AD7 31 EA/VPP 30 ALE/PROG 29 PSEN 28 P2.7/A15 27 P2.6/A14 26 P2.5/A13 25 P2.4/A12 24 P2.3/A11 23 P2.2/A10 22 P2.1/A9 * NO INTERNAL CONNECTION 21 P2.0/A8 Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Function P1.5/CEX2 P1.6/CEX3 P1.7/CEX4 RST P3.0/RxD NIC* P3.1/TxD P3.2/INT0 P3.3/INT1 P3.4/T0 P3.5/T1 P3.6/WR P3.7/RD XTAL2 XTAL1 12 Pin 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Function VSS NIC* P2.0/A8 P2.1/A9 P2.2/A10 P2.3/A11 P2.4/A12 P2.5/A13 P2.6/A14 P2.7/A15 PSEN ALE/PROG NIC* EA/VPP P0.7/AD7 22 Pin 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Function P0.6/AD6 P0.5/AD5 P0.4/AD4 P0.3/AD3 P0.2/AD2 P0.1/AD1 P0.0/AD0 VCC NIC* P1.0/T2 P1.1/T2EX P1.2/ECI P1.3/CEX0 P1.4/CEX1 11 23 1 33 44 34 PQFP SU00024 SU00021 1999 Sep 23 5 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 PIN DESCRIPTIONS MNEMONIC PDIP VSS VCC P0.0–0.7 20 40 39–32 PIN NUMBER PLCC 22 44 43–36 PQFP 16 38 37–30 I I I/O Ground: 0 V reference. Power Supply: This is the power supply voltage for normal, idle, and power-down operation. Port 0: Port 0 is an open-drain, bidirectional I/O port. Port 0 pins that have 1s written to them float and can be used as high-impedance inputs. Port 0 is also the multiplexed low-order address and data bus during accesses to external program and data memory. In this application, it uses strong internal pull-ups when emitting 1s. Port 1: Port 1 is an 8-bit bidirectional I/O port with internal pull-ups on all pins except P1.6 and P1.7 which are open drain. Port 1 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 1 pins that are externally pulled low will source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL). Alternate functions for 89C51RB2/RC2/RD2 Port 1 include: 1 2 3 4 5 6 7 8 P2.0–P2.7 21–28 2 3 4 5 6 7 8 9 24–31 40 41 42 43 44 1 2 3 18–25 I/O I I I/O I/O I/O I/O I/O I/O T2 (P1.0): Timer/Counter 2 external count input/Clockout (see Programmable Clock-Out) T2EX (P1.1): Timer/Counter 2 Reload/Capture/Direction Control ECI (P1.2): External Clock Input to the PCA CEX0 (P1.3): Capture/Compare External I/O for PCA module 0 CEX1 (P1.4): Capture/Compare External I/O for PCA module 1 CEX2 (P1.5): Capture/Compare External I/O for PCA module 2 CEX3 (P1.6): Capture/Compare External I/O for PCA module 3 CEX4 (P1.7): Capture/Compare External I/O for PCA module 4 Port 2: Port 2 is an 8-bit bidirectional I/O port with internal pull-ups. Port 2 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 2 pins that are externally being pulled low will source current because of the internal pull-ups. (See DC Electrical Characteristics: IIL). Port 2 emits the high-order address byte during fetches from external program memory and during accesses to external data memory that use 16-bit addresses (MOVX @DPTR). In this application, it uses strong internal pull-ups when emitting 1s. During accesses to external data memory that use 8-bit addresses (MOV @Ri), port 2 emits the contents of the P2 special function register. Port 3: Port 3 is an 8-bit bidirectional I/O port with internal pull-ups. Port 3 pins that have 1s written to them are pulled high by the internal pull-ups and can be used as inputs. As inputs, port 3 pins that are externally being pulled low will source current because of the pull-ups. (See DC Electrical Characteristics: IIL). Port 3 also serves the special features of the 89C51RB2/RC2/RD2, as listed below: RxD (P3.0): Serial input port TxD (P3.1): Serial output port INT0 (P3.2): External interrupt INT1 (P3.3): External interrupt T0 (P3.4): Timer 0 external input T1 (P3.5): Timer 1 external input WR (P3.6): External data memory write strobe RD (P3.7): External data memory read strobe Reset: A high on this pin for two machine cycles while the oscillator is running, resets the device. An internal diffused resistor to VSS permits a power-on reset using only an external capacitor to VCC. Address Latch Enable: Output pulse for latching the low byte of the address during an access to external memory. In normal operation, ALE is emitted twice every machine cycle, and can be used for external timing or clocking. Note that one ALE pulse is skipped during each access to external data memory. ALE can be disabled by setting SFR auxiliary.0. With this bit set, ALE will be active only during a MOVX instruction. TYPE NAME AND FUNCTION AND FUNCTION P1.0–P1.7 1–8 2–9 40–44, 1–3 I/O P3.0–P3.7 10–17 11, 13–19 5, 7–13 I/O 10 11 12 13 14 15 16 17 RST 9 11 13 14 15 16 17 18 19 10 5 7 8 9 10 11 12 13 4 I O I I I I O O I ALE 30 33 27 O 1999 Sep 23 6 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 MNEMONIC PDIP PSEN 29 PIN NUMBER PLCC 32 PQFP 26 TYPE O NAME AND FUNCTION Program Store Enable: The read strobe to external program memory. When executing code from the external program memory, PSEN is activated twice each machine cycle, except that two PSEN activations are skipped during each access to external data memory. PSEN is not activated during fetches from internal program memory. External Access Enable/Programming Supply Voltage: EA must be externally held low to enable the device to fetch code from external program memory locations. If EA is held high, the device executes from internal program memory. The value on the EA pin is latched when RST is released and any subsequent changes have no effect. This pin also receives the programming supply voltage (VPP) during Flash programming. Crystal 1: Input to the inverting oscillator amplifier and input to the internal clock generator circuits. Crystal 2: Output from the inverting oscillator amplifier. EA/VPP 31 35 29 I XTAL1 XTAL2 19 18 21 20 15 14 I O NOTE: To avoid “latch-up” effect at power-on, the voltage on any pin (other than VPP) must not be higher than VCC + 0.5 V or less than VSS – 0.5 V. 1999 Sep 23 7 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Table 1. Special Function Registers SYMBOL ACC* AUXR# AUXR1# B* CCAP0H# CCAP1H# CCAP2H# CCAP3H# CCAP4H# CCAP0L# CCAP1L# CCAP2L# CCAP3L# CCAP4L# CCAPM0# CCAPM1# CCAPM2# CCAPM3# CCAPM4# DESCRIPTION Accumulator Auxiliary Auxiliary 1 B register Module 0 Capture High Module 1 Capture High Module 2 Capture High Module 3 Capture High Module 4 Capture High Module 0 Capture Low Module 1 Capture Low Module 2 Capture Low Module 3 Capture Low Module 4 Capture Low Module 0 Mode Module 1 Mode Module 2 Mode Module 3 Mode Module 4 Mode DIRECT ADDRESS E0H 8EH A2H F0H FAH FBH FCH FDH FEH EAH EBH ECH EDH EEH DAH DBH DCH DDH DEH – – – – – DF CCON*# CH# CL# CMOD# DPTR: DPH DPL IE* IP* IPH# PCA Counter Control PCA Counter High PCA Counter Low PCA Counter Mode Data Pointer (2 bytes) Data Pointer High Data Pointer Low Interrupt Enable 0 Interrupt Priority Interrupt Priority High D8H F9H E9H D9H 83H 82H AF A8H B8H B7H EA BF – B7 – 87 P0* P1* P2* P3* Port 0 Port 1 Port 2 Port 3 80H 90H A0H B0H AD7 97 CEX4 A7 AD15 B7 RD AE EC BE PPC B6 PPCH 86 AD6 96 CEX3 A6 AD14 B6 WR SMOD0 AD ET2 BD PT2 B5 PT2H 85 AD5 95 CEX2 A5 AD13 B5 T1 – AC ES BC PS B4 PSH 84 AD4 94 CEX1 A4 AD12 B4 T0 – AB ET1 BB PT1 B3 PT1H 83 AD3 93 CEX0 A3 AD11 B3 INT1 GF1 AA EX1 BA PX1 B2 PX1H 82 AD2 92 ECI A2 AD10 B2 INT0 GF0 A9 ET0 B9 PT0 B1 PT0H 81 AD1 91 T2EX A1 AD9 B1 TxD PD A8 EX0 B8 PX0 B0 PX0H 80 AD0 90 T2 A0 AD8 B0 RxD IDL FFH 00xxx000B FFH FFH FFH x0000000B x0000000B 00H CF ECOM ECOM ECOM ECOM ECOM DE CR CAPP CAPP CAPP CAPP CAPP DD – CAPN CAPN CAPN CAPN CAPN DC CCF4 MAT MAT MAT MAT MAT DB CCF3 TOG TOG TOG TOG TOG DA CCF2 PWM PWM PWM PWM PWM D9 CCF1 ECCF ECCF ECCF ECCF ECCF D8 CCF0 00x00000B 00H 00H 00xxx000B 00H 00H BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION MSB E7 – – F7 E6 – – F6 E5 – ENBOOT LSB E4 – – F4 E3 – GF2 F3 E2 – 0 F2 E1 EXTRAM RESET VALUE 00H xxxxxx10B xxxxxxx0B 00H xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB xxxxxxxxB x0000000B x0000000B x0000000B x0000000B x0000000B E0 AO DPS F0 – F1 F5 CIDL WDTE – – – CPS1 CPS0 ECF PCON#1 Power Control 87H SMOD1 * SFRs are bit addressable. # SFRs are modified from or added to the 80C51 SFRs. – Reserved bits. 1. Reset value depends on reset source. 1999 Sep 23 8 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Table 1. Special Function Registers (Continued) SYMBOL DESCRIPTION DIRECT ADDRESS BIT ADDRESS, SYMBOL, OR ALTERNATIVE PORT FUNCTION MSB D7 PSW* RCAP2H# RCAP2L# SADDR# SADEN# SBUF SCON* SP TCON* Program Status Word Timer 2 Capture High Timer 2 Capture Low Slave Address Slave Address Mask Serial Data Buffer Serial Control Stack Pointer Timer Control D0H CBH CAH A9H B9H 99H 9F 98H 81H 88H SM0/FE LSB D6 AC D5 F0 D4 RS1 D3 RS0 D2 OV D1 F1 D0 P RESET VALUE CY 00000000B 00H 00H 00H 00H xxxxxxxxB 9E SM1 8E TR1 CE EXF2 – 9D SM2 8D TF0 CD RCLK – 9C REN 8C TR0 CC TCLK – 9B TB8 8B IE1 CB EXEN2 – 9A RB8 8A IT1 CA TR2 – 99 TI 89 IE0 C9 C/T2 T2OE 98 RI 88 IT0 C8 CP/RL2 DCEN 00H xxxxxx00B 00H 00H 00H 00H 00H 00H 00H 00H 07H 8F TF1 CF T2CON* T2MOD# TH0 TH1 TH2# TL0 TL1 TL2# Timer 2 Control Timer 2 Mode Control Timer High 0 Timer High 1 Timer High 2 Timer Low 0 Timer Low 1 Timer Low 2 C8H C9H 8CH 8DH CDH 8AH 8BH CCH TF2 – TMOD Timer Mode 89H GATE WDTRST Watchdog Timer Reset A6H * SFRs are bit addressable. # SFRs are modified from or added to the 80C51 SFRs. – Reserved bits. C/T M1 M0 GATE C/T M1 M0 00H OSCILLATOR CHARACTERISTICS XTAL1 and XTAL2 are the input and output, respectively, of an inverting amplifier. The pins can be configured for use as an on-chip oscillator. To drive the device from an external clock source, XTAL1 should be driven while XTAL2 is left unconnected. Minimum and maximum high and low times specified in the data sheet must be observed. This device is configured at the factory to operate using 6 clock periods per machine cycle, referred to in this datasheet as “6 clock mode”. (This yields performance equivalent to twice that of standard 80C51 family devices). It may be optionally configured on commercially-available EPROM programming equipment to operate at 12 clocks per machine cycle, referred to in this datasheet as “12 clock mode”. Once 12 clock mode has been configured, it cannot be changed back to 6 clock mode. RESET A reset is accomplished by holding the RST pin high for at least two machine cycles (12 oscillator periods in 6 clock mode, or 24 oscillator periods in 12 clock mode), while the oscillator is running. To ensure a good power-on reset, the RST pin must be high long enough to allow the oscillator time to start up (normally a few milliseconds) plus two machine cycles. At power-on, the voltage on VCC and RST must come up at the same time for a proper start-up. Ports 1, 2, and 3 will asynchronously be driven to their reset condition when a voltage above VIH1 (min.) is applied to RESET. The value on the EA pin is latched when RST is deasserted and has no further effect. 1999 Sep 23 9 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 LOW POWER MODES Stop Clock Mode The static design enables the clock speed to be reduced down to 0 MHz (stopped). When the oscillator is stopped, the RAM and Special Function Registers retain their values. This mode allows step-by-step utilization and permits reduced system power consumption by lowering the clock frequency down to any value. For lowest power consumption the Power Down mode is suggested. Design Consideration • When the idle mode is terminated by a hardware reset, the device normally resumes program execution, from where it left off, up to two machine cycles before the internal reset algorithm takes control. On-chip hardware inhibits access to internal RAM in this event, but access to the port pins is not inhibited. To eliminate the possibility of an unexpected write when Idle is terminated by reset, the instruction following the one that invokes Idle should not be one that writes to a port pin or to external memory. Idle Mode In the idle mode (see Table 2), the CPU puts itself to sleep while all of the on-chip peripherals stay active. The instruction to invoke the idle mode is the last instruction executed in the normal operating mode before the idle mode is activated. The CPU contents, the on-chip RAM, and all of the special function registers remain intact during this mode. The idle mode can be terminated either by any enabled interrupt (at which time the process is picked up at the interrupt service routine and continued), or by a hardware reset which starts the processor in the same manner as a power-on reset. ONCE™ Mode The ONCE (“On-Circuit Emulation”) Mode facilitates testing and debugging of systems without the device having to be removed from the circuit. The ONCE Mode is invoked by: 1. Pull ALE low while the device is in reset and PSEN is high; 2. Hold ALE low as RST is deactivated. While the device is in ONCE Mode, the Port 0 pins go into a float state, and the other port pins and ALE and PSEN are weakly pulled high. The oscillator circuit remains active. While the device is in this mode, an emulator or test CPU can be used to drive the circuit. Normal operation is restored when a normal reset is applied. Power-Down Mode To save even more power, a Power Down mode (see Table 2) can be invoked by software. In this mode, the oscillator is stopped and the instruction that invoked Power Down is the last instruction executed. The on-chip RAM and Special Function Registers retain their values down to 2.0 V and care must be taken to return VCC to the minimum specified operating voltages before the Power Down Mode is terminated. Either a hardware reset or external interrupt can be used to exit from Power Down. Reset redefines all the SFRs but does not change the on-chip RAM. An external interrupt allows both the SFRs and the on-chip RAM to retain their values. To properly terminate Power Down, the reset or external interrupt should not be executed before VCC is restored to its normal operating level and must be held active long enough for the oscillator to restart and stabilize (normally less than 10 ms). With an external interrupt, INT0 and INT1 must be enabled and configured as level-sensitive. Holding the pin low restarts the oscillator but bringing the pin back high completes the exit. Once the interrupt is serviced, the next instruction to be executed after RETI will be the one following the instruction that put the device into Power Down. Programmable Clock-Out A 50% duty cycle clock can be programmed to come out on P1.0. This pin, besides being a regular I/O pin, has two alternate functions. It can be programmed: 1. to input the external clock for Timer/Counter 2, or 2. to output a 50% duty cycle clock ranging from 122 Hz to 8 MHz at a 16 MHz operating frequency (61 Hz to 4 MHz in 12 clock mode). To configure the Timer/Counter 2 as a clock generator, bit C/T2 (in T2CON) must be cleared and bit T20E in T2MOD must be set. Bit TR2 (T2CON.2) also must be set to start the timer. The Clock-Out frequency depends on the oscillator frequency and the reload value of Timer 2 capture registers (RCAP2H, RCAP2L) as shown in this equation: n n= Oscillator Frequency (65536 * RCAP2H, RCAP2L) 2 in 6 clock mode 4 in 12 clock mode POWER OFF FLAG The Power Off Flag (POF) is set by on-chip circuitry when the VCC level on the 89C51RB2/RC2/RD2 rises from 0 to 5 V. The POF bit can be set or cleared by software allowing a user to determine if the reset is the result of a power-on or a warm start after powerdown. The VCC level must remain above 3 V for the POF to remain unaffected by the VCC level. Where (RCAP2H,RCAP2L) = the content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. In the Clock-Out mode Timer 2 roll-overs will not generate an interrupt. This is similar to when it is used as a baud-rate generator. It is possible to use Timer 2 as a baud-rate generator and a clock generator simultaneously. Note, however, that the baud-rate and the Clock-Out frequency will be the same. Table 2. External Pin Status During Idle and Power-Down Mode MODE Idle Idle Power-down Power-down PROGRAM MEMORY Internal External Internal External ALE 1 1 0 0 PSEN 1 1 0 0 PORT 0 Data Float Data Float PORT 1 Data Data Data Data PORT 2 Data Address Data Data PORT 3 Data Data Data Data 1999 Sep 23 10 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 TIMER 2 OPERATION Timer 2 Timer 2 is a 16-bit Timer/Counter which can operate as either an event timer or an event counter, as selected by C/T2* in the special function register T2CON (see Figure 1). Timer 2 has three operating modes: Capture, Auto-reload (up or down counting), and Baud Rate Generator, which are selected by bits in the T2CON as shown in Table 3. Counter Enable) which is located in the T2MOD register (see Figure 3). When reset is applied the DCEN=0 which means Timer 2 will default to counting up. If DCEN bit is set, Timer 2 can count up or down depending on the value of the T2EX pin. Figure 4 shows Timer 2 which will count up automatically since DCEN=0. In this mode there are two options selected by bit EXEN2 in T2CON register. If EXEN2=0, then Timer 2 counts up to 0FFFFH and sets the TF2 (Overflow Flag) bit upon overflow. This causes the Timer 2 registers to be reloaded with the 16-bit value in RCAP2L and RCAP2H. The values in RCAP2L and RCAP2H are preset by software means. If EXEN2=1, then a 16-bit reload can be triggered either by an overflow or by a 1-to-0 transition at input T2EX. This transition also sets the EXF2 bit. The Timer 2 interrupt, if enabled, can be generated when either TF2 or EXF2 are 1. In Figure 5 DCEN=1 which enables Timer 2 to count up or down. This mode allows pin T2EX to control the direction of count. When a logic 1 is applied at pin T2EX Timer 2 will count up. Timer 2 will overflow at 0FFFFH and set the TF2 flag, which can then generate an interrupt, if the interrupt is enabled. This timer overflow also causes the 16-bit value in RCAP2L and RCAP2H to be reloaded into the timer registers TL2 and TH2. When a logic 0 is applied at pin T2EX this causes Timer 2 to count down. The timer will underflow when TL2 and TH2 become equal to the value stored in RCAP2L and RCAP2H. Timer 2 underflow sets the TF2 flag and causes 0FFFFH to be reloaded into the timer registers TL2 and TH2. The external flag EXF2 toggles when Timer 2 underflows or overflows. This EXF2 bit can be used as a 17th bit of resolution if needed. The EXF2 flag does not generate an interrupt in this mode of operation. Capture Mode In the capture mode there are two options which are selected by bit EXEN2 in T2CON. If EXEN2=0, then timer 2 is a 16-bit timer or counter (as selected by C/T2* in T2CON) which, upon overflowing sets bit TF2, the timer 2 overflow bit. This bit can be used to generate an interrupt (by enabling the Timer 2 interrupt bit in the IE register). If EXEN2= 1, Timer 2 operates as described above, but with the added feature that a 1- to -0 transition at external input T2EX causes the current value in the Timer 2 registers, TL2 and TH2, to be captured into registers RCAP2L and RCAP2H, respectively. In addition, the transition at T2EX causes bit EXF2 in T2CON to be set, and EXF2 like TF2 can generate an interrupt (which vectors to the same location as Timer 2 overflow interrupt. The Timer 2 interrupt service routine can interrogate TF2 and EXF2 to determine which event caused the interrupt). The capture mode is illustrated in Figure 2 (There is no reload value for TL2 and TH2 in this mode. Even when a capture event occurs from T2EX, the counter keeps on counting T2EX pin transitions or osc/6 pulses (osc/12 in 12 clock mode).). Auto-Reload Mode (Up or Down Counter) In the 16-bit auto-reload mode, Timer 2 can be configured (as either a timer or counter [C/T2* in T2CON]) then programmed to count up or down. The counting direction is determined by bit DCEN (Down (MSB) TF2 Symbol TF2 EXF2 Position T2CON.7 T2CON.6 EXF2 RCLK TCLK EXEN2 TR2 C/T2 (LSB) CP/RL2 Name and Significance Timer 2 overflow flag set by a Timer 2 overflow and must be cleared by software. TF2 will not be set when either RCLK or TCLK = 1. Timer 2 external flag set when either a capture or reload is caused by a negative transition on T2EX and EXEN2 = 1. When Timer 2 interrupt is enabled, EXF2 = 1 will cause the CPU to vector to the Timer 2 interrupt routine. EXF2 must be cleared by software. EXF2 does not cause an interrupt in up/down counter mode (DCEN = 1). Receive clock flag. When set, causes the serial port to use Timer 2 overflow pulses for its receive clock in modes 1 and 3. RCLK = 0 causes Timer 1 overflow to be used for the receive clock. Transmit clock flag. When set, causes the serial port to use Timer 2 overflow pulses for its transmit clock in modes 1 and 3. TCLK = 0 causes Timer 1 overflows to be used for the transmit clock. Timer 2 external enable flag. When set, allows a capture or reload to occur as a result of a negative transition on T2EX if Timer 2 is not being used to clock the serial port. EXEN2 = 0 causes Timer 2 to ignore events at T2EX. Start/stop control for Timer 2. A logic 1 starts the timer. Timer or counter select. (Timer 2) 0 = Internal timer (OSC/6 in 6 clock mode or OSC/12 in 12 clock mode) 1 = External event counter (falling edge triggered). Capture/Reload flag. When set, captures will occur on negative transitions at T2EX if EXEN2 = 1. When cleared, auto-reloads will occur either with Timer 2 overflows or negative transitions at T2EX when EXEN2 = 1. When either RCLK = 1 or TCLK = 1, this bit is ignored and the timer is forced to auto-reload on Timer 2 overflow. SU01251 RCLK TCLK EXEN2 T2CON.5 T2CON.4 T2CON.3 TR2 C/T2 T2CON.2 T2CON.1 CP/RL2 T2CON.0 Figure 1. Timer/Counter 2 (T2CON) Control Register 1999 Sep 23 11 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Table 3. Timer 2 Operating Modes RCLK + TCLK 0 0 1 X CP/RL2 0 1 X X TR2 1 1 1 0 16-bit Auto-reload 16-bit Capture Baud rate generator (off) MODE OSC ÷ n* C/T2 = 0 TL2 (8-bits) C/T2 = 1 TH2 (8-bits) TF2 T2 Pin Control TR2 Transition Detector Capture Timer 2 Interrupt RCAP2L RCAP2H T2EX Pin EXF2 Control EXEN2 SU01252 * n = 6 in 6 clock mode, or 12 in 12 clock mode. Figure 2. Timer 2 in Capture Mode T2MOD Address = 0C9H Not Bit Addressable — Bit 7 — 6 — 5 — 4 — 3 — 2 T2OE 1 Reset Value = XXXX XX00B DCEN 0 Symbol — T2OE DCEN * Function Not implemented, reserved for future use.* Timer 2 Output Enable bit. Down Count Enable bit. When set, this allows Timer 2 to be configured as an up/down counter. User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. Figure 3. Timer 2 Mode (T2MOD) Control Register SU00729 1999 Sep 23 12 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 OSC ÷ n* C/T2 = 0 TL2 (8-BITS) C/T2 = 1 TH2 (8-BITS) T2 PIN CONTROL TR2 RELOAD TRANSITION DETECTOR RCAP2L RCAP2H TF2 TIMER 2 INTERRUPT T2EX PIN EXF2 CONTROL EXEN2 SU01253 * n = 6 in 6 clock mode, or 12 in 12 clock mode. Figure 4. Timer 2 in Auto-Reload Mode (DCEN = 0) (DOWN COUNTING RELOAD VALUE) FFH FFH TOGGLE EXF2 OSC ÷ n* C/T2 = 0 OVERFLOW TL2 TH2 TF2 INTERRUPT T2 PIN C/T2 = 1 CONTROL TR2 COUNT DIRECTION 1 = UP 0 = DOWN RCAP2L RCAP2H T2EX PIN (UP COUNTING RELOAD VALUE) * n = 6 in 6 clock mode, or 12 in 12 clock mode. Figure 5. Timer 2 Auto Reload Mode (DCEN = 1) SU01254 1999 Sep 23 13 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Timer 1 Overflow ÷2 “0” OSC C/T2 = 0 TL2 (8-bits) C/T2 = 1 T2 Pin Control “1” Reload “0” TCLK TH2 (8-bits) “1” “0” RCLK SMOD “1” ÷ 16 RX Clock TR2 Transition Detector RCAP2L RCAP2H ÷ 16 TX Clock T2EX Pin EXF2 Timer 2 Interrupt Control EXEN2 Note availability of additional external interrupt. SU01213 Figure 6. Timer 2 in Baud Rate Generator Mode Table 4. Timer 2 Generated Commonly Used Baud Rates Timer 2 Osc Freq RCAP2H 12 MHz 12 MHz 12 MHz 12 MHz 12 MHz 12 MHz 12 MHz 6 MHz 6 MHz FF FF FF FF FE FB F2 FD F9 RCAP2L FF D9 B2 64 C8 1E AF 8F 57 6 clock mode 750 k 19.2 k 5.6 k 4.8 k 2.4 k 600 220 600 220 The baud rates in modes 1 and 3 are determined by Timer 2’s overflow rate given below: Modes 1 and 3 Baud Rates + Timer 2 Overflow Rate 16 The timer can be configured for either “timer” or “counter” operation. In many applications, it is configured for “timer” operation (C/T2*=0). Timer operation is different for Timer 2 when it is being used as a baud rate generator. Usually, as a timer it would increment every machine cycle (i.e., the oscillator frequency in 6 clock mode, 1/12 the oscillator frequency in 12 clock mode). As a baud rate generator, it increments at the oscillator frequency in 6 clock mode (OSC/2 in 12 clock mode). Thus the baud rate formula is as follows: 1/ 6 Baud Rate 12 clock mode 375 k 9.6 k 2.8 k 2.4 k 1.2 k 300 110 300 110 Modes 1 and 3 Baud Rates = Oscillator Frequency [ n * [65536 * (RCAP2H, RCAP2L)]] *n= 16 in 6 clock mode 32 in 12 clock mode Baud Rate Generator Mode Bits TCLK and/or RCLK in T2CON (Table 4) allow the serial port transmit and receive baud rates to be derived from either Timer 1 or Timer 2. When TCLK= 0, Timer 1 is used as the serial port transmit baud rate generator. When TCLK= 1, Timer 2 is used as the serial port transmit baud rate generator. RCLK has the same effect for the serial port receive baud rate. With these two bits, the serial port can have different receive and transmit baud rates – one generated by Timer 1, the other by Timer 2. Figure 6 shows the Timer 2 in baud rate generation mode. The baud rate generation mode is like the auto-reload mode,in that a rollover in TH2 causes the Timer 2 registers to be reloaded with the 16-bit value in registers RCAP2H and RCAP2L, which are preset by software. Where: (RCAP2H, RCAP2L)= The content of RCAP2H and RCAP2L taken as a 16-bit unsigned integer. The Timer 2 as a baud rate generator mode shown in Figure 6, is valid only if RCLK and/or TCLK = 1 in T2CON register. Note that a rollover in TH2 does not set TF2, and will not generate an interrupt. Thus, the Timer 2 interrupt does not have to be disabled when Timer 2 is in the baud rate generator mode. Also if the EXEN2 (T2 external enable flag) is set, a 1-to-0 transition in T2EX (Timer/counter 2 trigger input) will set EXF2 (T2 external flag) but will not cause a reload from (RCAP2H, RCAP2L) to (TH2,TL2). Therefore when Timer 2 is in use as a baud rate generator, T2EX can be used as an additional external interrupt, if needed. 1999 Sep 23 14 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 When Timer 2 is in the baud rate generator mode, one should not try to read or write TH2 and TL2. As a baud rate generator, Timer 2 is incremented every state time (osc/2) or asynchronously from pin T2; under these conditions, a read or write of TH2 or TL2 may not be accurate. The RCAP2 registers may be read, but should not be written to, because a write might overlap a reload and cause write and/or reload errors. The timer should be turned off (clear TR2) before accessing the Timer 2 or RCAP2 registers. Table 4 shows commonly used baud rates and how they can be obtained from Timer 2. If Timer 2 is being clocked internally, the baud rate is: Baud Rate + f OSC [65536 * (RCAP2H, RCAP2L)]] 16 in 6 clock mode 32 in 12 clock mode [ n* *n= Where fOSC= Oscillator Frequency To obtain the reload value for RCAP2H and RCAP2L, the above equation can be rewritten as: RCAP2H, RCAP2L + 65536 * f OSC Baud Rate Summary of Baud Rate Equations Timer 2 is in baud rate generating mode. If Timer 2 is being clocked through pin T2(P1.0) the baud rate is: Baud Rate + Timer 2 Overflow Rate 16 n* Timer/Counter 2 Set-up Except for the baud rate generator mode, the values given for T2CON do not include the setting of the TR2 bit. Therefore, bit TR2 must be set, separately, to turn the timer on. see Table 5 for set-up of Timer 2 as a timer. Also see Table 6 for set-up of Timer 2 as a counter. Table 5. Timer 2 as a Timer T2CON MODE INTERNAL CONTROL (Note 1) 00H 01H 34H 24H 14H EXTERNAL CONTROL (Note 2) 08H 09H 36H 26H 16H 16-bit Auto-Reload 16-bit Capture Baud rate generator receive and transmit same baud rate Receive only Transmit only Table 6. Timer 2 as a Counter TMOD MODE INTERNAL CONTROL (Note 1) 02H 03H EXTERNAL CONTROL (Note 2) 0AH 0BH 16-bit Auto-Reload NOTES: 1. Capture/reload occurs only on timer/counter overflow. 2. Capture/reload occurs on timer/counter overflow and a 1-to-0 transition on T2EX (P1.1) pin except when Timer 2 is used in the baud rate generator mode. 1999 Sep 23 15 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Enhanced UART The UART operates in all of the usual modes that are described in the first section of Data Handbook IC20, 80C51-Based 8-Bit Microcontrollers. In addition the UART can perform framing error detect by looking for missing stop bits, and automatic address recognition. The UART also fully supports multiprocessor communication as does the standard 80C51 UART. When used for framing error detect the UART looks for missing stop bits in the communication. A missing bit will set the FE bit in the SCON register. The FE bit shares the SCON.7 bit with SM0 and the function of SCON.7 is determined by PCON.6 (SMOD0) (see Figure 7). If SMOD0 is set then SCON.7 functions as FE. SCON.7 functions as SM0 when SMOD0 is cleared. When used as FE SCON.7 can only be cleared by software. Refer to Figure 8. Automatic Address Recognition Automatic Address Recognition is a feature which allows the UART to recognize certain addresses in the serial bit stream by using hardware to make the comparisons. This feature saves a great deal of software overhead by eliminating the need for the software to examine every serial address which passes by the serial port. This feature is enabled by setting the SM2 bit in SCON. In the 9 bit UART modes, mode 2 and mode 3, the Receive Interrupt flag (RI) will be automatically set when the received byte contains either the “Given” address or the “Broadcast” address. The 9-bit mode requires that the 9th information bit is a 1 to indicate that the received information is an address and not data. Automatic address recognition is shown in Figure 9. The 8 bit mode is called Mode 1. In this mode the RI flag will be set if SM2 is enabled and the information received has a valid stop bit following the 8 address bits and the information is either a Given or Broadcast address. Mode 0 is the Shift Register mode and SM2 is ignored. Using the Automatic Address Recognition feature allows a master to selectively communicate with one or more slaves by invoking the Given slave address or addresses. All of the slaves may be contacted by using the Broadcast address. Two special Function Registers are used to define the slave’s address, SADDR, and the address mask, SADEN. SADEN is used to define which bits in the SADDR are to b used and which bits are “don’t care”. The SADEN mask can be logically ANDed with the SADDR to create the “Given” address which the master will use for addressing each of the slaves. Use of the Given address allows multiple slaves to be recognized while excluding others. The following examples will help to show the versatility of this scheme: Slave 0 SADDR = SADEN = Given = 1100 0000 1111 1101 1100 00X0 Slave 1 SADDR = SADEN = Given = 1100 0000 1111 1110 1100 000X In the above example SADDR is the same and the SADEN data is used to differentiate between the two slaves. Slave 0 requires a 0 in bit 0 and it ignores bit 1. Slave 1 requires a 0 in bit 1 and bit 0 is ignored. A unique address for Slave 0 would be 1100 0010 since slave 1 requires a 0 in bit 1. A unique address for slave 1 would be 1100 0001 since a 1 in bit 0 will exclude slave 0. Both slaves can be selected at the same time by an address which has bit 0 = 0 (for slave 0) and bit 1 = 0 (for slave 1). Thus, both could be addressed with 1100 0000. In a more complex system the following could be used to select slaves 1 and 2 while excluding slave 0: Slave 0 SADDR = SADEN = Given = SADDR = SADEN = Given = SADDR = SADEN = Given = 1100 0000 1111 1001 1100 0XX0 1110 0000 1111 1010 1110 0X0X 1110 0000 1111 1100 1110 00XX Slave 1 Slave 2 In the above example the differentiation among the 3 slaves is in the lower 3 address bits. Slave 0 requires that bit 0 = 0 and it can be uniquely addressed by 1110 0110. Slave 1 requires that bit 1 = 0 and it can be uniquely addressed by 1110 and 0101. Slave 2 requires that bit 2 = 0 and its unique address is 1110 0011. To select Slaves 0 and 1 and exclude Slave 2 use address 1110 0100, since it is necessary to make bit 2 = 1 to exclude slave 2. The Broadcast Address for each slave is created by taking the logical OR of SADDR and SADEN. Zeros in this result are trended as don’t-cares. In most cases, interpreting the don’t-cares as ones, the broadcast address will be FF hexadecimal. Upon reset SADDR (SFR address 0A9H) and SADEN (SFR address 0B9H) are leaded with 0s. This produces a given address of all “don’t cares” as well as a Broadcast address of all “don’t cares”. This effectively disables the Automatic Addressing mode and allows the microcontroller to use standard 80C51 type UART drivers which do not make use of this feature. 1999 Sep 23 16 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 SCON Address = 98H Bit Addressable SM0/FE Bit: SM1 SM2 5 REN 4 TB8 3 RB8 2 Tl 1 Rl 0 Reset Value = 0000 0000B 7 6 (SMOD0 = 0/1)* Symbol FE SM0 SM1 Function Framing Error bit. This bit is set by the receiver when an invalid stop bit is detected. The FE bit is not cleared by valid frames but should be cleared by software. The SMOD0 bit must be set to enable access to the FE bit. Serial Port Mode Bit 0, (SMOD0 must = 0 to access bit SM0) Serial Port Mode Bit 1 SM0 SM1 Mode 0 0 1 1 0 1 0 1 0 1 2 3 Description shift register 8-bit UART 9-bit UART 9-bit UART Baud Rate** fOSC/6 (6 clock mode) or fOSC/12 (12 clock mode) variable fOSC/32 or fOSC/16 (6 clock mode) or fOSC/64 or fOSC/32 (12 clock mode) variable SM2 Enables the Automatic Address Recognition feature in Modes 2 or 3. If SM2 = 1 then Rl will not be set unless the received 9th data bit (RB8) is 1, indicating an address, and the received byte is a Given or Broadcast Address. In Mode 1, if SM2 = 1 then Rl will not be activated unless a valid stop bit was received, and the received byte is a Given or Broadcast Address. In Mode 0, SM2 should be 0. Enables serial reception. Set by software to enable reception. Clear by software to disable reception. The 9th data bit that will be transmitted in Modes 2 and 3. Set or clear by software as desired. In modes 2 and 3, the 9th data bit that was received. In Mode 1, if SM2 = 0, RB8 is the stop bit that was received. In Mode 0, RB8 is not used. Transmit interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or at the beginning of the stop bit in the other modes, in any serial transmission. Must be cleared by software. Receive interrupt flag. Set by hardware at the end of the 8th bit time in Mode 0, or halfway through the stop bit time in the other modes, in any serial reception (except see SM2). Must be cleared by software. REN TB8 RB8 Tl Rl NOTE: *SMOD0 is located at PCON6. **fOSC = oscillator frequency SU01255 Figure 7. SCON: Serial Port Control Register 1999 Sep 23 17 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 D0 D1 D2 D3 D4 D5 D6 D7 D8 START BIT DATA BYTE ONLY IN MODE 2, 3 STOP BIT SET FE BIT IF STOP BIT IS 0 (FRAMING ERROR) SM0 TO UART MODE CONTROL SM0 / FE SM1 SM2 REN TB8 RB8 TI RI SCON (98H) SMOD1 SMOD0 – POF LVF GF0 GF1 IDL PCON (87H) 0 : SCON.7 = SM0 1 : SCON.7 = FE SU00044 Figure 8. UART Framing Error Detection D0 D1 D2 D3 D4 D5 D6 D7 D8 SM0 1 1 SM1 1 0 SM2 1 REN 1 TB8 X RB8 TI RI SCON (98H) RECEIVED ADDRESS D0 TO D7 PROGRAMMED ADDRESS COMPARATOR IN UART MODE 2 OR MODE 3 AND SM2 = 1: INTERRUPT IF REN=1, RB8=1 AND “RECEIVED ADDRESS” = “PROGRAMMED ADDRESS” – WHEN OWN ADDRESS RECEIVED, CLEAR SM2 TO RECEIVE DATA BYTES – WHEN ALL DATA BYTES HAVE BEEN RECEIVED: SET SM2 TO WAIT FOR NEXT ADDRESS. SU00045 Figure 9. UART Multiprocessor Communication, Automatic Address Recognition 1999 Sep 23 18 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Interrupt Priority Structure The 89C51RB2/RC2/RD2 has an 8 source four-level interrupt structure (see Table 7). There are 3 SFRs associated with the four-level interrupt. They are the IE, IP, and IPH. (See Figures 10, 11, and 12.) The IPH (Interrupt Priority High) register makes the four-level interrupt structure possible. The IPH is located at SFR address B7H. The structure of the IPH register and a description of its bits is shown in Figure 12. The function of the IPH SFR is simple and when combined with the IP SFR determines the priority of each interrupt. The priority of each interrupt is determined as shown in the following table: PRIORITY BITS IPH.x 0 0 1 1 IP.x 0 1 0 1 INTERRUPT PRIORITY LEVEL PRIORITY LEVEL Level 0 (lowest priority) Level 1 Level 2 Level 3 (highest priority) The priority scheme for servicing the interrupts is the same as that for the 80C51, except there are four interrupt levels rather than two as on the 80C51. An interrupt will be serviced as long as an interrupt of equal or higher priority is not already being serviced. If an interrupt of equal or higher level priority is being serviced, the new interrupt will wait until it is finished before being serviced. If a lower priority level interrupt is being serviced, it will be stopped and the new interrupt serviced. When the new interrupt is finished, the lower priority level interrupt that was stopped will be completed. Table 7. Interrupt Table POLLING PRIORITY 1 2 3 4 5 6 7 REQUEST BITS IE0 TP0 IE1 TF1 CF, CCFn n = 0–4 RI, TI TF2, EXF2 HARDWARE CLEAR? N (L)1 Y N (L) Y (T) Y N N N Y (T)2 VECTOR ADDRESS 03H 0BH 13H 1BH 33H 23H 2BH X0 T0 X1 T1 PCA SP T2 SOURCE NOTES: 1. L = Level activated 2. T = Transition activated 7 IE (0A8H) EA 6 EC 5 ET2 4 ES 3 ET1 2 EX1 1 ET0 0 EX0 Enable Bit = 1 enables the interrupt. Enable Bit = 0 disables it. BIT IE.7 IE.6 IE.5 IE.4 IE.3 IE.2 IE.1 IE.0 SYMBOL EA EC ET2 ES ET1 EX1 ET0 EX0 FUNCTION Global disable bit. If EA = 0, all interrupts are disabled. If EA = 1, each interrupt can be individually enabled or disabled by setting or clearing its enable bit. PCA interrupt enable bit Timer 2 interrupt enable bit. Serial Port interrupt enable bit. Timer 1 interrupt enable bit. External interrupt 1 enable bit. Timer 0 interrupt enable bit. External interrupt 0 enable bit. SU01290 Figure 10. IE Registers 1999 Sep 23 19 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 7 IP (0B8H) – 6 PPC 5 PT2 4 PS 3 PT1 2 PX1 1 PT0 0 PX0 Priority Bit = 1 assigns high priority Priority Bit = 0 assigns low priority BIT IP.7 IP.6 IP.5 IP.4 IP.3 IP.2 IP.1 IP.0 SYMBOL – PPC PT2 PS PT1 PX1 PT0 PX0 FUNCTION – PCA interrupt priority bit Timer 2 interrupt priority bit. Serial Port interrupt priority bit. Timer 1 interrupt priority bit. External interrupt 1 priority bit. Timer 0 interrupt priority bit. External interrupt 0 priority bit. Figure 11. IP Registers SU01291 7 IPH (B7H) – 6 PPCH 5 PT2H 4 PSH 3 PT1H 2 PX1H 1 PT0H 0 PX0H Priority Bit = 1 assigns higher priority Priority Bit = 0 assigns lower priority BIT IPH.7 IPH.6 IPH.5 IPH.4 IPH.3 IPH.2 IPH.1 IPH.0 SYMBOL – PPCH PT2H PSH PT1H PX1H PT0H PX0H FUNCTION – PCA interrupt priority bit Timer 2 interrupt priority bit high. Serial Port interrupt priority bit high. Timer 1 interrupt priority bit high. External interrupt 1 priority bit high. Timer 0 interrupt priority bit high. External interrupt 0 priority bit high. Figure 12. IPH Registers SU01292 1999 Sep 23 20 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Reduced EMI Mode The AO bit (AUXR.0) in the AUXR register when set disables the ALE output. be quickly toggled simply by executing an INC AUXR1 instruction without affecting the GF2 bit. The ENBOOT bit determines whether the BOOTROM is enabled or disabled. This bit will automatically be set if the status byte is non zero during reset or PSEN is pulled low, ALE floats high, and EA > VIH on the falling edge of reset. Otherwise, this bit will be cleared during reset. Reduced EMI Mode AUXR (8EH) 7 – 6 – 5 – 4 – 3 – 2 – 1 EXTRAM 0 AO AUXR.1 AUXR.0 EXTRAM AO Turns off ALE output. DPS BIT0 AUXR1 DPTR1 DPTR0 DPH (83H) DPL (82H) EXTERNAL DATA MEMORY Dual DPTR The dual DPTR structure (see Figure 13) is a way by which the chip will specify the address of an external data memory location. There are two 16-bit DPTR registers that address the external memory, and a single bit called DPS = AUXR1/bit0 that allows the program code to switch between them. SU00745A • New Register Name: AUXR1# • SFR Address: A2H • Reset Value: xxxxxxx0B AUXR1 (A2H) 7 – 6 – 5 ENBOOT 4 – Figure 13. DPTR Instructions The instructions that refer to DPTR refer to the data pointer that is currently selected using the AUXR1/bit 0 register. The six instructions that use the DPTR are as follows: 3 GF2 2 0 1 – 0 DPS INC DPTR MOV DPTR, #data16 MOV A, @ A+DPTR MOVX A, @ DPTR MOVX @ DPTR , A JMP @ A + DPTR Increments the data pointer by 1 Loads the DPTR with a 16-bit constant Move code byte relative to DPTR to ACC Move external RAM (16-bit address) to ACC Move ACC to external RAM (16-bit address) Jump indirect relative to DPTR Where: DPS = AUXR1/bit0 = Switches between DPTR0 and DPTR1. Select Reg DPTR0 DPTR1 DPS 0 1 The DPS bit status should be saved by software when switching between DPTR0 and DPTR1. The GF2 bit is a general purpose user-defined flag. Note that bit 2 is not writable and is always read as a zero. This allows the DPS bit to The data pointer can be accessed on a byte-by-byte basis by specifying the low or high byte in an instruction which accesses the SFRs. See Application Note AN458 for more details. 1999 Sep 23 21 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Programmable Counter Array (PCA) The Programmable Counter Array available on the 89C51RB2/RC2/RD2 is a special 16-bit Timer that has five 16-bit capture/compare modules associated with it. Each of the modules can be programmed to operate in one of four modes: rising and/or falling edge capture, software timer, high-speed output, or pulse width modulator. Each module has a pin associated with it in port 1. Module 0 is connected to P1.3(CEX0), module 1 to P1.4(CEX1), etc. The basic PCA configuration is shown in Figure 14. The PCA timer is a common time base for all five modules and can be programmed to run at: 1/6 the oscillator frequency, 1/2 the oscillator frequency, the Timer 0 overflow, or the input on the ECI pin (P1.2). The timer count source is determined from the CPS1 and CPS0 bits in the CMOD SFR as follows (see Figure 17): CPS1 CPS0 PCA Timer Count Source 0 0 1/6 oscillator frequency (6 clock mode); 1/12 oscillator frequency (12 clock mode) 0 1 1/2 oscillator frequency (6 clock mode); 1/4 oscillator frequency (12 clock mode) 1 0 Timer 0 overflow 1 1 External Input at ECI pin In the CMOD SFR are three additional bits associated with the PCA. They are CIDL which allows the PCA to stop during idle mode, WDTE which enables or disables the watchdog function on module 4, and ECF which when set causes an interrupt and the PCA overflow flag CF (in the CCON SFR) to be set when the PCA timer overflows. These functions are shown in Figure 15. The watchdog timer function is implemented in module 4 (see Figure 24). The CCON SFR contains the run control bit for the PCA and the flags for the PCA timer (CF) and each module (refer to Figure 18). To run the PCA the CR bit (CCON.6) must be set by software. The PCA is shut off by clearing this bit. The CF bit (CCON.7) is set when the PCA counter overflows and an interrupt will be generated if the ECF bit in the CMOD register is set, The CF bit can only be cleared by software. Bits 0 through 4 of the CCON register are the flags for the modules (bit 0 for module 0, bit 1 for module 1, etc.) and are set by hardware when either a match or a capture occurs. These flags also can only be cleared by software. The PCA interrupt system shown in Figure 16. Each module in the PCA has a special function register associated with it. These registers are: CCAPM0 for module 0, CCAPM1 for module 1, etc. (see Figure 19). The registers contain the bits that control the mode that each module will operate in. The ECCF bit (CCAPMn.0 where n=0, 1, 2, 3, or 4 depending on the module) enables the CCF flag in the CCON SFR to generate an interrupt when a match or compare occurs in the associated module. PWM (CCAPMn.1) enables the pulse width modulation mode. The TOG bit (CCAPMn.2) when set causes the CEX output associated with the module to toggle when there is a match between the PCA counter and the module’s capture/compare register. The match bit MAT (CCAPMn.3) when set will cause the CCFn bit in the CCON register to be set when there is a match between the PCA counter and the module’s capture/compare register. The next two bits CAPN (CCAPMn.4) and CAPP (CCAPMn.5) determine the edge that a capture input will be active on. The CAPN bit enables the negative edge, and the CAPP bit enables the positive edge. If both bits are set both edges will be enabled and a capture will occur for either transition. The last bit in the register ECOM (CCAPMn.6) when set enables the comparator function. Figure 20 shows the CCAPMn settings for the various PCA functions. There are two additional registers associated with each of the PCA modules. They are CCAPnH and CCAPnL and these are the registers that store the 16-bit count when a capture occurs or a compare should occur. When a module is used in the PWM mode these registers are used to control the duty cycle of the output. 16 BITS MODULE 0 P1.3/CEX0 MODULE 1 16 BITS PCA TIMER/COUNTER TIME BASE FOR PCA MODULES MODULE 3 MODULE FUNCTIONS: 16-BIT CAPTURE 16-BIT TIMER 16-BIT HIGH SPEED OUTPUT 8-BIT PWM WATCHDOG TIMER (MODULE 4 ONLY) MODULE 2 P1.4/CEX1 P1.5/CEX2 P1.6/CEX3 MODULE 4 P1.7/CEX4 SU00032 Figure 14. Programmable Counter Array (PCA) 1999 Sep 23 22 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 OSC/6 (6 CLOCK MODE) OR OSC/12 (12 CLOCK MODE) OSC/2 (6 CLOCK MODE) OR OSC/4 (12 CLOCK MODE) TO PCA MODULES OVERFLOW CH CL INTERRUPT TIMER 0 OVERFLOW 16–BIT UP COUNTER EXTERNAL INPUT (P1.2/ECI) 00 01 10 11 DECODE IDLE CIDL WDTE –– –– –– CPS1 CPS0 ECF CMOD (C1H) CF CR –– CCF4 CCF3 CCF2 CCF1 CCF0 CCON (C0H) SU01256 Figure 15. PCA Timer/Counter CF PCA TIMER/COUNTER CR –– CCF4 CCF3 CCF2 CCF1 CCF0 CCON (C0H) MODULE 0 IE.6 EC MODULE 1 IE.7 EA TO INTERRUPT PRIORITY DECODER MODULE 2 MODULE 3 MODULE 4 CMOD.0 ECF CCAPMn.0 ECCFn SU01097 Figure 16. PCA Interrupt System 1999 Sep 23 23 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 CMOD Address = C1H Reset Value = 00XX X000B CIDL Bit: Symbol CIDL WDTE – CPS1 CPS0 Function 7 WDTE 6 – 5 – 4 – 3 CPS1 2 CPS0 1 ECF 0 Counter Idle control: CIDL = 0 programs the PCA Counter to continue functioning during idle Mode. CIDL = 1 programs it to be gated off during idle. Watchdog Timer Enable: WDTE = 0 disables Watchdog Timer function on PCA Module 4. WDTE = 1 enables it. Not implemented, reserved for future use.* PCA Count Pulse Select bit 1. PCA Count Pulse Select bit 0. CPS1 CPS0 Selected PCA Input** 0 0 1 1 0 1 0 1 0 1 2 3 Internal clock, fOSC/6 in 6 clock mode (fOSC/12 in 12 clock mode) Internal clock, fOSC/2 in 6 clock mode (fOSC/4 in 12 clock mode) Timer 0 overflow External clock at ECI/P1.2 pin (max. rate = fOSC/4 in 6 clock mode, fOCS/8 in 12 clock mode) ECF PCA Enable Counter Overflow interrupt: ECF = 1 enables CF bit in CCON to generate an interrupt. ECF = 0 disables that function of CF. NOTE: * User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. ** fOSC = oscillator frequency SU01257 Figure 17. CMOD: PCA Counter Mode Register CCON Address = 0C0H Bit Addressable CF Bit: Symbol CF CR – CCF4 CCF3 CCF2 CCF1 CCF0 Function 7 CR 6 – 5 CCF4 4 CCF3 3 CCF2 2 CCF1 1 CCF0 0 Reset Value = 00X0 0000B PCA Counter Overflow flag. Set by hardware when the counter rolls over. CF flags an interrupt if bit ECF in CMOD is set. CF may be set by either hardware or software but can only be cleared by software. PCA Counter Run control bit. Set by software to turn the PCA counter on. Must be cleared by software to turn the PCA counter off. Not implemented, reserved for future use*. PCA Module 4 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. PCA Module 3 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. PCA Module 2 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. PCA Module 1 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. PCA Module 0 interrupt flag. Set by hardware when a match or capture occurs. Must be cleared by software. NOTE: * User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. SU01099 Figure 18. CCON: PCA Counter Control Register 1999 Sep 23 24 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 CCAPMn Address CCAPM0 CCAPM1 CCAPM2 CCAPM3 CCAPM4 0C2H 0C3H 0C4H 0C5H 0C6H Reset Value = X000 0000B Not Bit Addressable – Bit: Symbol – ECOMn CAPPn CAPNn MATn TOGn PWMn ECCFn Function Not implemented, reserved for future use*. Enable Comparator. ECOMn = 1 enables the comparator function. Capture Positive, CAPPn = 1 enables positive edge capture. Capture Negative, CAPNn = 1 enables negative edge capture. Match. When MATn = 1, a match of the PCA counter with this module’s compare/capture register causes the CCFn bit in CCON to be set, flagging an interrupt. Toggle. When TOGn = 1, a match of the PCA counter with this module’s compare/capture register causes the CEXn pin to toggle. Pulse Width Modulation Mode. PWMn = 1 enables the CEXn pin to be used as a pulse width modulated output. Enable CCF interrupt. Enables compare/capture flag CCFn in the CCON register to generate an interrupt. 7 ECOMn 6 CAPPn 5 CAPNn 4 MATn 3 TOGn 2 PWMn 1 ECCFn 0 NOTE: *User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. SU01100 Figure 19. CCAPMn: PCA Modules Compare/Capture Registers – X X X X X X X X ECOMn 0 X X X 1 1 1 1 CAPPn 0 1 0 1 0 0 0 0 CAPNn 0 0 1 1 0 0 0 0 MATn 0 0 0 0 1 1 0 1 TOGn 0 0 0 0 0 1 0 X PWMn 0 0 0 0 0 0 1 0 ECCFn 0 X X X X X 0 X No operation 16-bit capture by a positive-edge trigger on CEXn 16-bit capture by a negative trigger on CEXn 16-bit capture by a transition on CEXn 16-bit Software Timer 16-bit High Speed Output 8-bit PWM Watchdog Timer MODULE FUNCTION Figure 20. PCA Module Modes (CCAPMn Register) PCA Capture Mode To use one of the PCA modules in the capture mode either one or both of the CCAPM bits CAPN and CAPP for that module must be set. The external CEX input for the module (on port 1) is sampled for a transition. When a valid transition occurs the PCA hardware loads the value of the PCA counter registers (CH and CL) into the module’s capture registers (CCAPnL and CCAPnH). If the CCFn bit for the module in the CCON SFR and the ECCFn bit in the CCAPMn SFR are set then an interrupt will be generated. Refer to Figure 21. 16-bit Software Timer Mode The PCA modules can be used as software timers by setting both the ECOM and MAT bits in the modules CCAPMn register. The PCA timer will be compared to the module’s capture registers and when a match occurs an interrupt will occur if the CCFn (CCON SFR) and the ECCFn (CCAPMn SFR) bits for the module are both set (see Figure 22). High Speed Output Mode In this mode the CEX output (on port 1) associated with the PCA module will toggle each time a match occurs between the PCA counter and the module’s capture registers. To activate this mode the TOG, MAT, and ECOM bits in the module’s CCAPMn SFR must be set (see Figure 23). Pulse Width Modulator Mode All of the PCA modules can be used as PWM outputs. Figure 24 shows the PWM function. The frequency of the output depends on the source for the PCA timer. All of the modules will have the same frequency of output because they all share the PCA timer. The duty cycle of each module is independently variable using the module’s capture register CCAPLn. When the value of the PCA CL SFR is less than the value in the module’s CCAPLn SFR the output will be low, when it is equal to or greater than the output will be high. When CL overflows from FF to 00, CCAPLn is reloaded with the value in CCAPHn. the allows updating the PWM without glitches. The PWM and ECOM bits in the module’s CCAPMn register must be set to enable the PWM mode. 1999 Sep 23 25 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 CF CR –– CCF4 CCF3 CCF2 CCF1 CCF0 CCON (0C0H) PCA INTERRUPT (TO CCFn) PCA TIMER/COUNTER CH CL CEXn CAPTURE CCAPnH CCAPnL –– ECOMn 0 CAPPn CAPNn MATn 0 TOGn 0 PWMn 0 ECCFn CCAPMn, n= 0 to 4 (C2H – C6H) SU01101 Figure 21. PCA Capture Mode CF WRITE TO CCAPnH RESET CR –– CCF4 CCF3 CCF2 CCF1 CCF0 CCON (C0H) WRITE TO CCAPnL 0 1 ENABLE CCAPnH CCAPnL PCA INTERRUPT (TO CCFn) 16–BIT COMPARATOR MATCH CH CL PCA TIMER/COUNTER –– ECOMn CAPPn 0 CAPNn 0 MATn TOGn 0 PWMn 0 ECCFn CCAPMn, n= 0 to 4 (C2H – C6H) SU01102 Figure 22. PCA Compare Mode 1999 Sep 23 26 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 CF WRITE TO CCAPnH RESET CCAPnH CR –– CCF4 CCF3 CCF2 CCF1 CCF0 CCON (C0H) WRITE TO CCAPnL 0 1 ENABLE CCAPnL PCA INTERRUPT (TO CCFn) MATCH 16–BIT COMPARATOR TOGGLE CH CL CEXn PCA TIMER/COUNTER –– ECOMn CAPPn 0 CAPNn 0 MATn TOGn 1 PWMn 0 ECCFn CCAPMn, n: 0..4 (C2H – C6H) SU01103 Figure 23. PCA High Speed Output Mode CCAPnH CCAPnL 0 CL < CCAPnL ENABLE 8–BIT COMPARATOR CL >= CCAPnL 1 OVERFLOW CL PCA TIMER/COUNTER CEXn –– ECOMn CAPPn 0 CAPNn 0 MATn 0 TOGn 0 PWMn ECCFn 0 CCAPMn, n: 0..4 (C2H – C6H) SU01104 Figure 24. PCA PWM Mode 1999 Sep 23 27 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 CIDL WRITE TO CCAP4L RESET WDTE –– –– –– CPS1 CPS0 ECF CMOD (C1H) WRITE TO CCAP4H 1 0 ENABLE CCAP4H CCAP4L MODULE 4 MATCH 16–BIT COMPARATOR RESET CH CL PCA TIMER/COUNTER –– ECOMn CAPPn 0 CAPNn 0 MATn 1 TOGn X PWMn 0 ECCFn X CCAPM4 (C6H) SU01105 Figure 25. PCA Watchdog Timer m(Module 4 only) PCA Watchdog Timer An on-board watchdog timer is available with the PCA to improve the reliability of the system without increasing chip count. Watchdog timers are useful for systems that are susceptible to noise, power glitches, or electrostatic discharge. Module 4 is the only PCA module that can be programmed as a watchdog. However, this module can still be used for other modes if the watchdog is not needed. Figure 25 shows a diagram of how the watchdog works. The user pre-loads a 16-bit value in the compare registers. Just like the other compare modes, this 16-bit value is compared to the PCA timer value. If a match is allowed to occur, an internal reset will be generated. This will not cause the RST pin to be driven high. In order to hold off the reset, the user has three options: 1. periodically change the compare value so it will never match the PCA timer, 2. periodically change the PCA timer value so it will never match the compare values, or 3. disable the watchdog by clearing the WDTE bit before a match occurs and then re-enable it. The first two options are more reliable because the watchdog timer is never disabled as in option #3. If the program counter ever goes astray, a match will eventually occur and cause an internal reset. The second option is also not recommended if other PCA modules are being used. Remember, the PCA timer is the time base for all modules; changing the time base for other modules would not be a good idea. Thus, in most applications the first solution is the best option. Figure 26 shows the code for initializing the watchdog timer. Module 4 can be configured in either compare mode, and the WDTE bit in CMOD must also be set. The user’s software then must periodically change (CCAP4H,CCAP4L) to keep a match from occurring with the PCA timer (CH,CL). This code is given in the WATCHDOG routine in Figure 26. This routine should not be part of an interrupt service routine, because if the program counter goes astray and gets stuck in an infinite loop, interrupts will still be serviced and the watchdog will keep getting reset. Thus, the purpose of the watchdog would be defeated. Instead, call this subroutine from the main program within 216 count of the PCA timer. 1999 Sep 23 28 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 INIT_WATCHDOG: MOV CCAPM4, #4CH MOV CCAP4L, #0FFH MOV CCAP4H, #0FFH ORL CMOD, #40H ; ; ; ; ; ; ; ; Module 4 in compare mode Write to low byte first Before PCA timer counts up to FFFF Hex, these compare values must be changed Set the WDTE bit to enable the watchdog timer without changing the other bits in CMOD ; ;******************************************************************** ; ; Main program goes here, but CALL WATCHDOG periodically. ; ;******************************************************************** ; WATCHDOG: CLR EA ; Hold off interrupts MOV CCAP4L, #00 ; Next compare value is within MOV CCAP4H, CH ; 255 counts of the current PCA SETB EA ; timer value RET Figure 26. PCA Watchdog Timer Initialization Code 1999 Sep 23 29 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Expanded Data RAM Addressing The 89C51RB2/RC2/RD2 has internal data memory that is mapped into four separate segments: the lower 128 bytes of RAM, upper 128 bytes of RAM, 128 bytes Special Function Register (SFR), and 256 bytes expanded RAM (ERAM) (768 bytes for the RD2). The four segments are: 1. The Lower 128 bytes of RAM (addresses 00H to 7FH) are directly and indirectly addressable. 2. The Upper 128 bytes of RAM (addresses 80H to FFH) are indirectly addressable only. 3. The Special Function Registers, SFRs, (addresses 80H to FFH) are directly addressable only. 4. The 256/768-bytes expanded RAM (ERAM, 00H – 1FFH/2FFH) are indirectly accessed by move external instruction, MOVX, and with the EXTRAM bit cleared, see Figure 27. The Lower 128 bytes can be accessed by either direct or indirect addressing. The Upper 128 bytes can be accessed by indirect addressing only. The Upper 128 bytes occupy the same address space as the SFR. That means they have the same address, but are physically separate from SFR space. When an instruction accesses an internal location above address 7FH, the CPU knows whether the access is to the upper 128 bytes of data RAM or to SFR space by the addressing mode used in the instruction. Instructions that use direct addressing access SFR space. For example: MOV 0A0H,#data accesses the SFR at location 0A0H (which is P2). Instructions that use indirect addressing access the Upper 128 bytes of data RAM. For example: MOV @R0,#data where R0 contains 0A0H, accesses the data byte at address 0A0H, rather than P2 (whose address is 0A0H). The ERAM can be accessed by indirect addressing, with EXTRAM bit cleared and MOVX instructions. This part of memory is physically located on-chip, logically occupies the first 7936-bytes of external data memory. With EXTRAM = 0, the ERAM is indirectly addressed, using the MOVX instruction in combination with any of the registers R0, R1 of the selected bank or DPTR. An access to ERAM will not affect ports P0, P3.6 (WR#) and P3.7 (RD#). P2 SFR is output during external addressing. For example, with EXTRAM = 0, MOVX @R0,#data where R0 contains 0A0H, access the ERAM at address 0A0H rather than external memory. An access to external data memory locations higher than the ERAM will be performed with the MOVX DPTR instructions in the same way as in the standard 80C51, so with P0 and P2 as data/address bus, and P3.6 and P3.7 as write and read timing signals. Refer to Figure 28. With EXTRAM = 1, MOVX @Ri and MOVX @DPTR will be similar to the standard 80C51. MOVX @ Ri will provide an 8-bit address multiplexed with data on Port 0 and any output port pins can be used to output higher order address bits. This is to provide the external paging capability. MOVX @DPTR will generate a 16-bit address. Port 2 outputs the high-order eight address bits (the contents of DPH) while Port 0 multiplexes the low-order eight address bits (DPL) with data. MOVX @Ri and MOVX @DPTR will generate either read or write signals on P3.6 (WR) and P3.7 (RD). The stack pointer (SP) may be located anywhere in the 256 bytes RAM (lower and upper RAM) internal data memory. The stack may not be located in the ERAM. AUXR Address = 8EH Not Bit Addressable — Bit: 7 — 6 — 5 — 4 — 3 — 2 EXTRAM 1 AO 0 Reset Value = xxxx xx00B Symbol AO Function Disable/Enable ALE AO Operating Mode 0 ALE is emitted at a constant rate of 1/3 the oscillator frequency (6 clock mode; 1/6 fOSC in 12 clock mode). 1 ALE is active only during a MOVX or MOVC instruction. Internal/External RAM access using MOVX @Ri/@DPTR EXTRAM Operating Mode 0 Internal ERAM access using MOVX @Ri/@DPTR 1 External data memory access. Not implemented, reserved for future use*. EXTRAM — NOTE: *User software should not write 1s to reserved bits. These bits may be used in future 8051 family products to invoke new features. In that case, the reset or inactive value of the new bit will be 0, and its active value will be 1. The value read from a reserved bit is indeterminate. SU01258 Figure 27. AUXR: Auxiliary Register 1999 Sep 23 30 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 FF FF FFFF UPPER 128 BYTES INTERNAL RAM SPECIAL FUNCTION REGISTER EXTERNAL DATA MEMORY ERAM 256 or 768 BYTES 80 80 LOWER 128 BYTES INTERNAL RAM 100 00 00 0000 SU01293 Figure 28. Internal and External Data Memory Address Space with EXTRAM = 0 HARDWARE WATCHDOG TIMER (ONE-TIME ENABLED WITH RESET-OUT FOR 89C51RB2/RC2/RD2) The WDT is intended as a recovery method in situations where the CPU may be subjected to software upset. The WDT consists of a 14-bit counter and the WatchDog Timer reset (WDTRST) SFR. The WDT is disabled at reset. To enable the WDT, user must write 01EH and 0E1H in sequence to the WDTRST, SFR location 0A6H. When WDT is enabled, it will increment every machine cycle while the oscillator is running and there is no way to disable the WDT except through reset (either hardware reset or WDT overflow reset). When WDT overflows, it will drive an output reset HIGH pulse at the RST-pin (see the note below). Using the WDT To enable the WDT, user must write 01EH and 0E1H in sequence to the WDTRST, SFR location 0A6H. When WDT is enabled, the user needs to service it by writing to 01EH and 0E1H to WDTRST to avoid WDT overflow. The 14-bit counter overflows when it reaches 16383 (3FFFH) and this will reset the device. When WDT is enabled, it will increment every machine cycle while the oscillator is running. This means the user must reset the WDT at least every 16383 machine cycles. To reset the WDT, the user must write 01EH and 0E1H to WDTRST. WDTRST is a write only register. The WDT counter cannot be read or written. When WDT overflows, it will generate an output RESET pulse at the reset pin (see note below). The RESET pulse duration is 98 × TOSC (6 clock mode; 196 in 12 clock mode), where TOSC = 1/fOSC. To make the best use of the WDT, it should be serviced in those sections of code that will periodically be executed within the time required to prevent a WDT reset. ABSOLUTE MAXIMUM RATINGS1, 2, 3 PARAMETER Operating temperature under bias Storage temperature range Voltage on EA/VPP pin to VSS Voltage on any other pin to VSS Maximum IOL per I/O pin RATING 0 to +70 or –40 to +85 –65 to +150 0 to +13.0 –0.5 to +6.5 15 UNIT °C °C V V mA Power dissipation (based on package heat transfer limitations, not device power consumption) 1.5 W NOTES: 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any conditions other than those described in the AC and DC Electrical Characteristics section of this specification is not implied. 2. This product includes circuitry specifically designed for the protection of its internal devices from the damaging effects of excessive static charge. Nonetheless, it is suggested that conventional precautions be taken to avoid applying greater than the rated maximum. 3. Parameters are valid over operating temperature range unless otherwise specified. All voltages are with respect to VSS unless otherwise noted. 4. Programming is guaranteed from 0°C to Tmax for all devices. 1999 Sep 23 31 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 DC ELECTRICAL CHARACTERISTICS Tamb = 0°C to +70°C or –40°C to +85°C; 5 V ±10%; VSS = 0 V SYMBOL VIL VIH VIH1 VOL VOL1 VOH VOH1 IIL ITL ILI ICC Input low voltage Input high voltage (ports 0, 1, 2, 3, EA) Input high voltage, XTAL1, RST Output low voltage, ports 1, 2, 38 Output low voltage, port 0, ALE, PSEN 7, 8 Output high voltage, ports 1, 2, 3 3 Output high voltage (port 0 in external bus mode), ALE9, PSEN3 Logical 0 input current, ports 1, 2, 3 Logical 1-to-0 transition current, ports 1, 2, 36 Input leakage current, port 0 Power supply current (see Figure 36): Active mode (see Note 5) Idle mode (see Note 5) Power-down mode or clock stopped (see Figure 42 f conditions) for Fi diti ) Internal reset pull-down resistor VCC = 4.5 V IOL = 1.6 mA2 VCC = 4.5 V IOL = 3.2 mA2 VCC = 4.5 V IOH = –30 µA VCC = 4.5 V IOH = –3.2 mA VIN = 0.4 V VIN = 2.0 V See Note 4 0.45 < VIN < VCC – 0.3 See Note 5 VCC – 0.7 VCC – 0.7 –1 –75 –650 ±10 PARAMETER TEST CONDITIONS 4.5 V < VCC < 5.5 V LIMITS MIN –0.5 0.2VCC+0.9 0.7VCC TYP1 MAX 0.2VCC–0.1 VCC+0.5 VCC+0.5 0.4 0.4 UNIT V V V V V V V µA µA µA Tamb = 0°C to 70°C Tamb = –40°C to +85°C 40 100 pF), the noise pulse on the ALE pin may exceed 0.8 V. In such cases, it may be desirable to qualify ALE with a Schmitt Trigger, or use an address latch with a Schmitt Trigger STROBE input. IOL can exceed these conditions provided that no single output sinks more than 5 mA and no more than two outputs exceed the test conditions. 3. Capacitive loading on ports 0 and 2 may cause the VOH on ALE and PSEN to momentarily fall below the VCC–0.7 specification when the address bits are stabilizing. 4. Pins of ports 1, 2 and 3 source a transition current when they are being externally driven from 1 to 0. The transition current reaches its maximum value when VIN is approximately 2 V. 5. See Figures 39 through 42 for ICC test conditions and Figure 36 for ICC vs Freq. Active mode: ICC(MAX) = (1.8 × FREQ. + 20)mA for all devices, in 6 clock mode; (0.9 × FREQ. + 20)mA in 12 clock mode. Idle mode: ICC(MAX) = (0.7 × FREQ. +1.0)mA in 6 clock mode; (0.35 × FREQ. +1.0)mA in 12 clock mode. 6. This value applies to Tamb = 0°C to +70°C. 7. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all other outputs = 80 pF. 8. Under steady state (non-transient) conditions, IOL must be externally limited as follows: Maximum IOL per port pin: 15 mA (*NOTE: This is 85°C specification.) 26 mA Maximum IOL per 8-bit port: Maximum total IOL for all outputs: 71 mA If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test conditions. 9. ALE is tested to VOH1, except when ALE is off then VOH is the voltage specification. 10. Pin capacitance is characterized but not tested. Pin capacitance is less than 25 pF. Pin capacitance of ceramic package is less than 15 pF (except EA is 25 pF). 11. Programming is guaranteed from 0°C to Tmax for all devices. 1999 Sep 23 32 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 AC ELECTRICAL CHARACTERISTICS (6 CLOCK MODE) Tamb = 0°C to +70°C or –40°C to +85°C, VCC = 5 V ±10%, VSS = 0V1, 2, 3 SYMBOL 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tAVIV tPLAZ Data Memory tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tWHQX tQVWH tRLAZ tWHLH tCHCX tCLCX tCLCH tCHCL Shift Register tXLXL tQVXH tXHQX tXHDX 32 32 32 32 Serial port clock cycle time Output data setup to clock rising edge Output data hold after clock rising edge Input data hold after clock rising edge 6tCLCL 5tCLCL–133 tCLCL–30 0 300 117 20 0 ns ns ns ns 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 31 30, 31 30, 31 33 33 33 33 RD pulse width WR pulse width RD low to valid data in Data hold after RD Data float after RD ALE low to valid data in Address to valid data in ALE low to RD or WR low Address valid to WR low or RD low Data valid to WR transition Data hold after WR Data valid to WR high RD low to address float RD or WR high to ALE high High time Low time Rise time Fall time 0.5tCLCL–20 20 20 1.5tCLCL–50 2tCLCL–75 0.5tCLCL–25 0.5tCLCL–20 3.5tCLCL–130 0 0.5tCLCL+20 tCLCL–tCLCX tCLCL–tCHCX 5 5 5 0 tCLCL–20 4tCLCL–150 4.5tCLCL–165 1.5tCLCL+50 25 25 0 5 45 0 45 3tCLCL–100 3tCLCL–100 2.5tCLCL–90 0 5 50 60 125 50 50 35 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns FIGURE 29 29 29 29 29 29 29 29 29 29 29 29 Oscillator frequency ALE pulse width Address valid to ALE low Address hold after ALE low ALE low to valid instruction in ALE low to PSEN low PSEN pulse width PSEN low to valid instruction in Input instruction hold after PSEN Input instruction float after PSEN Address to valid instruction in PSEN low to address float 0 0.5tCLCL–20 2.5tCLCL–80 10 0.5tCLCL–20 1.5tCLCL–45 1.5tCLCL–60 0 5 45 10 PARAMETER VARIABLE CLOCK4 MIN 0 tCLCL–40 0.5tCLCL–20 0.5tCLCL–20 2tCLCL–65 5 30 15 MAX 20 20 MHz CLOCK4 MIN 0 10 5 5 35 MAX 20 UNIT MHz ns ns ns ns ns ns ns ns ns ns ns External Clock tXHDV 32 Clock rising edge to input data valid 5tCLCL–133 117 ns NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. 2. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all other outputs = 80 pF. 3. Interfacing the microcontroller to devices with float times up to 45 ns is permitted. This limited bus contention will not cause damage to Port 0 drivers. 4. Parts are tested to 2 MHz, but are guaranteed to operate down to 0 Hz. 1999 Sep 23 33 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 AC ELECTRICAL CHARACTERISTICS (12 CLOCK MODE) Tamb = 0°C to +70°C or –40°C to +85°C, VCC = 5 V ±10%, VSS = 0 V1, 2, 3 SYMBOL 1/tCLCL tLHLL tAVLL tLLAX tLLIV tLLPL tPLPH tPLIV tPXIX tPXIZ tAVIV tPLAZ Data Memory tRLRH tWLWH tRLDV tRHDX tRHDZ tLLDV tAVDV tLLWL tAVWL tQVWX tWHQX tQVWH tRLAZ tWHLH tCHCX tCLCX tCLCH tCHCL Shift Register tXLXL tQVXH tXHQX tXHDX 32 32 32 32 Serial port clock cycle time Output data setup to clock rising edge Output data hold after clock rising edge Input data hold after clock rising edge 12tCLCL 10tCLCL–133 2tCLCL–80 0 360 167 50 0 ns ns ns ns 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 30, 31 31 30, 31 30, 31 33 33 33 33 RD pulse width WR pulse width RD low to valid data in Data hold after RD Data float after RD ALE low to valid data in Address to valid data in ALE low to RD or WR low Address valid to WR low or RD low Data valid to WR transition Data hold after WR Data valid to WR high RD low to address float RD or WR high to ALE high High time Low time Rise time Fall time tCLCL–25 17 17 3tCLCL–50 4tCLCL–75 tCLCL–30 tCLCL–25 7tCLCL–130 0 tCLCL+25 tCLCL–tCLCX tCLCL–tCHCX 5 5 5 0 2tCLCL–28 8tCLCL–150 9tCLCL–165 3tCLCL+50 40 45 0 5 80 0 55 6tCLCL–100 6tCLCL–100 5tCLCL–90 0 32 90 105 140 82 82 60 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns FIGURE 29 29 29 29 29 29 29 29 29 29 29 29 Oscillator frequency ALE pulse width Address valid to ALE low Address hold after ALE low ALE low to valid instruction in ALE low to PSEN low PSEN pulse width PSEN low to valid instruction in Input instruction hold after PSEN Input instruction float after PSEN Address to valid instruction in PSEN low to address float 0 tCLCL–25 5tCLCL–80 10 tCLCL–25 3tCLCL–45 3tCLCL–60 0 5 70 10 PARAMETER VARIABLE CLOCK4 MIN 0 2tCLCL–40 tCLCL–25 tCLCL–25 4tCLCL–65 5 45 30 MAX 33 33 MHz CLOCK4 MIN 0 21 5 5 55 MAX 33 UNIT MHz ns ns ns ns ns ns ns ns ns ns ns External Clock tXHDV 32 Clock rising edge to input data valid 10tCLCL–133 167 ns NOTES: 1. Parameters are valid over operating temperature range unless otherwise specified. 2. Load capacitance for port 0, ALE, and PSEN = 100 pF, load capacitance for all other outputs = 80 pF. 3. Interfacing the microcontroller to devices with float times up to 45 ns is permitted. This limited bus contention will not cause damage to Port 0 drivers. 4. Parts are tested to 3.5 MHz, but guaranteed to operate down to 0 Hz. 1999 Sep 23 34 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 EXPLANATION OF THE AC SYMBOLS Each timing symbol has five characters. The first character is always ‘t’ (= time). The other characters, depending on their positions, indicate the name of a signal or the logical status of that signal. The designations are: A – Address C – Clock D – Input data H – Logic level high I – Instruction (program memory contents) L – Logic level low, or ALE P – PSEN Q – Output data R – RD signal t – Time V – Valid W – WR signal X – No longer a valid logic level Z – Float Examples: tAVLL = Time for address valid to ALE low. tLLPL = Time for ALE low to PSEN low. tLHLL ALE tAVLL tLLPL PSEN tPLPH tLLIV tPLIV tPLAZ tPXIX INSTR IN tLLAX tPXIZ PORT 0 A0–A7 A0–A7 tAVIV PORT 2 A0–A15 A8–A15 SU00006 Figure 29. External Program Memory Read Cycle ALE tWHLH PSEN tLLDV tLLWL RD tRLRH tAVLL PORT 0 tLLAX tRLAZ A0–A7 FROM RI OR DPL tRLDV tRHDX DATA IN tRHDZ A0–A7 FROM PCL INSTR IN tAVWL tAVDV PORT 2 P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH SU00025 Figure 30. External Data Memory Read Cycle 1999 Sep 23 35 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 ALE tWHLH PSEN tLLWL WR tWLWH tAVLL PORT 0 tLLAX tQVWX tQVWH tWHQX A0–A7 FROM RI OR DPL DATA OUT A0–A7 FROM PCL INSTR IN tAVWL PORT 2 P2.0–P2.7 OR A8–A15 FROM DPF A0–A15 FROM PCH SU00026 Figure 31. External Data Memory Write Cycle INSTRUCTION ALE 0 1 2 3 4 5 6 7 8 tXLXL CLOCK tQVXH OUTPUT DATA 0 WRITE TO SBUF tXHQX 1 2 3 4 5 6 7 tXHDV INPUT DATA VALID CLEAR RI VALID tXHDX SET TI VALID VALID VALID VALID VALID VALID SET RI SU00027 Figure 32. Shift Register Mode Timing VCC–0.5 0.45V 0.7VCC 0.2VCC–0.1 tCHCL tCLCX tCLCL tCHCX tCLCH SU00009 Figure 33. External Clock Drive 1999 Sep 23 36 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 VCC–0.5 0.2VCC+0.9 VLOAD 0.2VCC–0.1 VLOAD+0.1V VLOAD–0.1V TIMING REFERENCE POINTS VOH–0.1V VOL+0.1V 0.45V NOTE: AC inputs during testing are driven at VCC –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’. Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’. NOTE: For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs, and begins to float when a 100mV change from the loaded VOH/VOL level occurs. IOH/IOL ≥ ±20mA. SU00717 SU00718 Figure 34. AC Testing Input/Output Figure 35. Float Waveform 60 50 ICC (mA) 40 89C51RB2/RC2/RD2 MAXIMUM ACTIVE ICC 30 TYPICAL ACTIVE ICC 20 10 MAXIMUM IDLE TYPICAL IDLE 2 4 6 8 10 12 14 16 18 Frequency at XTAL1 (MHz, 6 clock mode) SU01300 Figure 36. ICC vs. FREQ Valid only within frequency specifications of the device under test VCC–0.5 0.2VCC+0.9 0.2VCC–0.1 0.45V NOTE: AC inputs during testing are driven at VCC –0.5 for a logic ‘1’ and 0.45V for a logic ‘0’. Timing measurements are made at VIH min for a logic ‘1’ and VIL max for a logic ‘0’. SU00010 Figure 37. AC Testing Input/Output 1999 Sep 23 37 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 VLOAD+0.1V VLOAD VLOAD–0.1V TIMING REFERENCE POINTS VOH–0.1V VOL+0.1V NOTE: For timing purposes, a port is no longer floating when a 100mV change from load voltage occurs, and begins to float when a 100mV change from the loaded VOH/VOL level occurs. IOH/IOL ≥ ±20mA. SU00011 Figure 38. Float Waveform VCC ICC VCC VCC VCC VCC–0.5 0.5V tCHCL tCLCX tCLCL tCHCX tCLCH RST 89C51RB2 89C51RC2 89C51RD2 P0 EA SU01297 (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS Figure 41. Clock Signal Waveform for ICC Tests in Active and Idle Modes. tCLCL = tCHCL = 10 ns VCC SU01294 ICC VCC RST EA P0 VCC Figure 39. ICC Test Condition, Active Mode. All other pins are disconnected VCC ICC VCC RST EA VCC (NC) XTAL2 XTAL1 VSS 89C51RB2 89C51RC2 89C51RD2 89C51RB2 89C51RC2 89C51RD2 P0 SU01296 (NC) CLOCK SIGNAL XTAL2 XTAL1 VSS Figure 42. ICC Test Condition, Power Down Mode. All other pins are disconnected; VCC = 2V to 5.5V SU01295 Figure 40. ICC Test Condition, Idle Mode. All other pins are disconnected 1999 Sep 23 38 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 FLASH EPROM MEMORY GENERAL DESCRIPTION The 89C51RB2/RC2/RD2 Flash memory augments EPROM functionality with in-circuit electrical erasure and programming. The Flash can be read and written as bytes. The Chip Erase operation will erase the entire program memory. The Block Erase function can erase any Flash block. In-system programming and standard parallel programming are both available. On-chip erase and write timing generation contribute to a user friendly programming interface. The 89C51RB2/RC2/RD2 Flash reliably stores memory contents even after 1000 erase and program cycles. The cell is designed to optimize the erase and programming mechanisms. In addition, the combination of advanced tunnel oxide processing and low internal electric fields for erase and programming operations produces reliable cycling. The 89C51RB2/RC2/RD2 uses a +5 V VPP supply to perform the Program/Erase algorithms. CAPABILITIES OF THE PHILIPS 89C51 FLASH-BASED MICROCONTROLLERS Flash organization The 89C51RB2/RC2/RD2 contains 16KB/32KB/64Kbytes of Flash program memory. This memory is organized as 5 separate blocks. The first two blocks are 8 kB in size, filling the program memory space from address 0 through 3FFF hex. The final three blocks are 16 kB in size and occupy addresses from 4000 through FFFF hex. Figure 43 depicts the Flash memory configurations. Flash Programming and Erasure There are three methods of erasing or programming of the Flash memory that may be used. First, the Flash may be programmed or erased in the end-user application by calling low-level routines through a common entry point in the Boot ROM. The end-user application, though, must be executing code from a different block than the block that is being erased or programmed. Second, the on-chip ISP boot loader may be invoked. This ISP boot loader will, in turn, call low-level routines through the same common entry point in the Boot ROM that can be used by the end-user application. Third, the Flash may be programmed or erased using the parallel method by using a commercially available EPROM programmer. The parallel programming method used by these devices is similar to that used by EPROM 87C51, but it is not identical, and the commercially available programmer will need to have support for these devices. FEATURES • Flash EPROM internal program memory with Block Erase. • Internal 1 kB fixed boot ROM, containing low-level in-system programming routines and a default serial loader. User program can call these routines to perform In-Application Programming (IAP). The Boot ROM can be turned off to provide access to the full 64 kB Flash memory. • Boot vector allows user provided Flash loader code to reside anywhere in the Flash memory space. This configuration provides flexibility to the user. Boot ROM When the microcontroller programs its own Flash memory, all of the low level details are handled by code that is permanently contained in a 1 kB Boot ROM that is separate from the Flash memory. A user program simply calls the common entry point with appropriate parameters in the Boot ROM to accomplish the desired operation. Boot ROM operations include things like: erase block, program byte, verify byte, program security lock bit, etc. The Boot ROM overlays the program memory space at the top of the address space from FC00 to FFFF hex, when it is enabled. The Boot ROM may be turned off so that the upper 1 kB of Flash program memory are accessible for execution. • Default loader in Boot ROM allows programming via the serial port without the need for a user provided loader. • Up to 64 kB external program memory if the internal program memory is disabled (EA = 0). • Programming and erase voltage +5 V or +12 V. • Read/Programming/Erase: – Byte-wise read (100 ns access time). – Byte Programming (20 ms). – Typical erase times: Block Erase (8 kB or 16 kB) in 3 seconds. Full Erase (64 kB) in 3 seconds. • Parallel programming with 87C51 compatible hardware interface to programmer. • In-system programming. • Programmable security for the code in the Flash. • 1000 minimum erase/program cycles for each byte. • 10-year minimum data retention. 1999 Sep 23 39 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 FFFF BOOT ROM FFFF FC00 BLOCK 4 16 kB (1 kB) 89C51RD2 C000 BLOCK 3 PROGRAM ADDRESS 8000 16 kB BLOCK 2 16 kB 89C51RC2 4000 BLOCK 1 8 kB 89C51RB2 2000 BLOCK 0 8 kB 0000 SU01298 Figure 43. Flash Memory Configurations Power-On Reset Code Execution The 89C51RB2/RC2/RD2 contains two special Flash registers: the BOOT VECTOR and the STATUS BYTE. At the falling edge of reset, the 89C51RB2/RC2/RD2 examines the contents of the Status Byte. If the Status Byte is set to zero, power-up execution starts at location 0000H, which is the normal start address of the user’s application code. When the Status Byte is set to a value other than zero, the contents of the Boot Vector is used as the high byte of the execution address and the low byte is set to 00H. The factory default setting is 0FCH, corresponds to the address 0FC00H for the factory masked-ROM ISP boot loader. A custom boot loader can be written with the Boot Vector set to the custom boot loader. NOTE: When erasing the Status Byte or Boot Vector, both bytes are erased at the same time. It is necessary to reprogram the Boot Vector after erasing and updating the Status Byte. Hardware Activation of the Boot Loader The boot loader can also be executed by holding PSEN LOW, EA greater than VIH (such as +5 V), and ALE HIGH (or not connected) at the falling edge of RESET. This is the same effect as having a non-zero status byte. This allows an application to be built that will normally execute the end user’s code but can be manually forced into ISP operation. If the factory default setting for the Boot Vector (0FCH) is changed, it will no longer point to the ISP masked-ROM boot loader code. If this happens, the only way it is possible to change the contents of the Boot Vector is through the parallel programming method, provided that the end user application does not contain a customized loader that provides for erasing and reprogramming of the Boot Vector and Status Byte. After programming the Flash, the status byte should be programmed to zero in order to allow execution of the user’s application code beginning at address 0000H. 1999 Sep 23 40 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 VCC VPP RST VCC TxD XTAL2 RxD +12 V OR + 5 V +5 V TxD RxD VSS 89C51RB2 89C51RC2 89C51RD2 XTAL1 VSS SU01299 Figure 44. In-System Programming with a Minimum of Pins In-System Programming (ISP) The In-System Programming (ISP) is performed without removing the microcontroller from the system. The In-System Programming (ISP) facility consists of a series of internal hardware resources coupled with internal firmware to facilitate remote programming of the 89C51RB2/RC2/RD2 through the serial port. This firmware is provided by Philips and embedded within each 89C51RB2/RC2/RD2 device. The Philips In-System Programming (ISP) facility has made in-circuit programming in an embedded application possible with a minimum of additional expense in components and circuit board area. The ISP function uses five pins: TxD, RxD, VSS, VCC, and VPP (see Figure 44). Only a small connector needs to be available to interface your application to an external circuit in order to use this feature. The VPP supply should be adequately decoupled and VPP not allowed to exceed datasheet limits. first byte in the record. If there are zero bytes in the record, this field is often set to 0000. The “RR” string indicates the record type. A record type of “00” is a data record. A record type of “01” indicates the end-of-file mark. In this application, additional record types will be added to indicate either commands or data for the ISP facility. The maximum number of data bytes in a record is limited to 16 (decimal). ISP commands are summarized in Table 8. As a record is received by the 89C51RB2/RC2/RD2, the information in the record is stored internally and a checksum calculation is performed. The operation indicated by the record type is not performed until the entire record has been received. Should an error occur in the checksum, the 89C51RB2/RC2/RD2 will send an “X” out the serial port indicating a checksum error. If the checksum calculation is found to match the checksum in the record, then the command will be executed. In most cases, successful reception of the record will be indicated by transmitting a “.” character out the serial port (displaying the contents of the internal program memory is an exception). In the case of a Data Record (record type 00), an additional check is made. A “.” character will NOT be sent unless the record checksum matched the calculated checksum and all of the bytes in the record were successfully programmed. For a data record, an “X” indicates that the checksum failed to match, and an “R” character indicates that one of the bytes did not properly program. It is necessary to send a type 02 record (specify oscillator frequency) to the 89C51RB2/RC2/RD2 before programming data. The ISP facility was designed to that specific crystal frequencies were not required in order to generate baud rates or time the programming pulses. The user thus needs to provide the 89C51RB2/RC2/RD2 with information required to generate the proper timing. Record type 02 is provided for this purpose. WinISP, a software utility to implement ISP programming with a PC, is available from Philips. Commercial serial ISP programmers are available from third parties. Please check the Philips web site (www.semiconductors.philips.com) for additional information. Using the In-System Programming (ISP) The ISP feature allows for a wide range of baud rates to be used in your application, independent of the oscillator frequency. It is also adaptable to a wide range of oscillator frequencies. This is accomplished by measuring the bit-time of a single bit in a received character. This information is then used to program the baud rate in terms of timer counts based on the oscillator frequency. The ISP feature requires that an initial character (an uppercase U) be sent to the 89C51RB2/RC2/RD2 to establish the baud rate. The ISP firmware provides auto-echo of received characters. Once baud rate initialization has been performed, the ISP firmware will only accept Intel Hex-type records. Intel Hex records consist of ASCII characters used to represent hexadecimal values and are summarized below: :NNAAAARRDD..DDCC In the Intel Hex record, the “NN” represents the number of data bytes in the record. The 89C51RB2/RC2/RD2 will accept up to 16 (10H) data bytes. The “AAAA” string represents the address of the 1999 Sep 23 41 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Table 8. Intel-Hex Records Used by In-System Programming RECORD TYPE 00 COMMAND/DATA FUNCTION Program Data :nnaaaa00dd....ddcc Where: Nn = number of bytes (hex) in record Aaaa = memory address of first byte in record dd....dd = data bytes cc = checksum Example: :10008000AF5F67F0602703E0322CFA92007780C3FD End of File (EOF), no operation :xxxxxx01cc Where: xxxxxx = required field, but value is a “don’t care” cc = checksum Example: :00000001FF Specify Oscillator Frequency :01xxxx02ddcc Where: xxxx = required field, but value is a “don’t care” dd = integer oscillator frequency rounded down to nearest MHz cc = checksum Example: :0100000210ED (dd = 10h = 16, used for 16.0–16.9 MHz) 01 02 1999 Sep 23 42 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 RECORD TYPE 03 COMMAND/DATA FUNCTION Miscellaneous Write Functions :nnxxxx03ffssddcc Where: nn = number of bytes (hex) in record xxxx = required field, but value is a “don’t care” 03 = Write Function ff = subfunction code ss = selection code dd = data input (as needed) cc = checksum Subfunction Code = 01 (Erase Blocks) ff = 01 ss = block code as shown below: block 0, 0k to 8k, 00H block 1, 8k to 16k, 20H block 2, 16k to 32k, 40H block 3, 32k to 48k, 80H block 4, 48k to 64k, C0H Example: :0200000301C03A erase block 4 Subfunction Code = 04 (Erase Boot Vector and Status Byte) ff = 04 ss = don’t care dd = don’t care Example: :020000030400F7 erase boot vector and status byte Subfunction Code = 05 (Program Security Bits) ff = 05 ss = 00 program security bit 1 (inhibit writing to Flash) 01 program security bit 2 (inhibit Flash verify) 02 program security bit 3 (disable eternal memory) Example: :020000030501F5 program security bit 2 Subfunction Code = 06 (Program Status Byte or Boot Vector) ff = 06 ss = 00 program status byte 01 program boot vector Example: :030000030601FCF7 program boot vector with 0FCH Subfunction Code = 07 (Full Chip Erase) Erases all blocks, security bits, and sets status and boot vector to default values ff = 07 ss = don’t care dd = don’t care Example: :0100000307F5 full chip erase 04 Display Device Data or Blank Check – Record type 04 causes the contents of the entire Flash array to be sent out the serial port in a formatted display. This display consists of an address and the contents of 16 bytes starting with that address. No display of the device contents will occur if security bit 2 has been programmed. The dumping of the device data to the serial port is terminated by the reception of any character. General Format of Function 04 :05xxxx04sssseeeeffcc Where: 05 = number of bytes (hex) in record xxxx = required field, but value is a “don’t care” 04 = “Display Device Data or Blank Check” function code ssss = starting address eeee = ending address ff = subfunction 00 = display data 01 = blank check cc = checksum Example: :0500000440004FFF0069 display 4000–4FFF 1999 Sep 23 43 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 RECORD TYPE 05 Miscellaneous Read Functions COMMAND/DATA FUNCTION General Format of Function 05 :02xxxx05ffsscc Where: 02 = number of bytes (hex) in record xxxx = required field, but value is a “don’t care” 05 = “Miscellaneous Read” function code ffss = subfunction and selection code 0000 = read signature byte – manufacturer id (15H) 0001 = read signature byte – device id # 1 (C2H) 0002 = read signature byte – device id # 2 0700 = read security bits 0701 = read status byte 0702 = read boot vector = checksum read signature byte – device id # 1 cc Example: :020000050001F8 06 Direct Load of Baud Rate General Format of Function 06 :02xxxx06hhllcc Where: 02 = number of bytes (hex) in record xxxx = required field, but value is a “don’t care” 06 = ”Direct Load of Baud Rate” function code hh = high byte of Timer 2 ll = low byte of Timer 2 cc = checksum Example: :02000006F50003 1999 Sep 23 44 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 In Application Programming Method Several In Application Programming (IAP) calls are available for use by an application program to permit selective erasing and programming of Flash sectors. All calls are made through a common interface, PGM_MTP. The programming functions are selected by setting up the microcontroller’s registers before making a call to PGM_MTP at FFF0H. The oscillator frequency is an integer number rounded down to the nearest megahertz. For example, set R0 to 11 for 11.0592 MHz. Results are returned in the registers. The API calls are shown in Table 9. Table 9. IAP calls IAP CALL PROGRAM DATA BYTE PARAMETER Input Parameters: R0 = osc freq (integer) R1 = 02h DPTR = address of byte to program ACC = byte to program Return Parameter ACC = 00 if pass, !00 if fail Input Parameters: R0 = osc freq (integer) R1 = 01h DPH = block code as shown below: block 0, 0k to 8k, 00H block 1, 8k to 16k, 20H block 2, 16k to 32k, 40H block 3, 32k to 48k, 80H block 4, 48k to 64k, C0H DPL = 00h Return Parameter none ERASE BOOT VECTOR Input Parameters: R0 = osc freq (integer) R1 = 04h DPH = 00h DPL = don’t care Return Parameter none Input Parameters: R0 = osc freq (integer) R1 = 05h DPH = 00h DPL = 00h – security bit # 1 (inhibit writing to Flash) 01h – security bit # 2 (inhibit Flash verify) 02h – security bit # 3 (disable external memory) Return Parameter none Input Parameters: R0 = osc freq (integer) R1 = 06h DPH = 00h DPL = 00h – program status byte ACC = status byte Return Parameter ACC = status byte Input Parameters: R0 = osc freq (interger) R1 = 06h DPH = 00h DPL = 01h – program boot vector ACC = boot vector Return Parameter ACC = boot vector Input Parameters: R1 = 03h DPTR = address of byte to read Return Parameter ACC = value of byte read 45 ERASE BLOCK PROGRAM SECURITY BIT PROGRAM STATUS BYTE PROGRAM BOOT VECTOR READ DEVICE DATA 1999 Sep 23 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 IAP CALL READ MANUFACTURER ID Input Parameters: R0 = osc freq (integer) R1 = 00h DPH = 00h DPL = 00h (manufacturer ID) Return Parameter ACC = value of byte read Input Parameters: R0 = osc freq (integer) R1 = 00h DPH = 00h DPL = 01h (device ID # 1) Return Parameter ACC = value of byte read Input Parameters: R0 = osc freq (integer) R1 = 00h DPH = 00h DPL = 02h (device ID # 2) Return Parameter ACC = value of byte read Input Parameters: R0 = osc freq (integer) R1 = 07h DPH = 00h DPL = 00h (security bits) Return Parameter ACC = value of byte read Input Parameters: R0 = osc freq (integer) R1 = 07h DPH = 00h DPL = 01h (status byte) Return Parameter ACC = value of byte read Input Parameters: R0 = osc freq (integer) R1 = 07h DPH = 00h DPL = 02h (boot vector) Return Parameter ACC = value of byte read Input Parameters: R0 = osc frequency R1 = 08h DPH = don’t care DPL = don’t care Return Parameter none PARAMETER READ DEVICE ID # 1 READ DEVICE ID # 2 READ SECURITY BITS READ STATUS BYTE READ BOOT VECTOR FULL CHIP ERASE 1999 Sep 23 46 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Security The security feature protects against software piracy and prevents the contents of the Flash from being read. The Security Lock bits are located in Flash. The 89C51RB2/RC2/RD2 has 3 programmable security lock bits that will provide different levels of protection for the on-chip code and data (see Table 10). Table 10. SECURITY LOCK BITS1 LB1 X 1 X X LB2 X X 1 X LB3 X X X 1 PROTECTION DESCRIPTION DESCRIPTION MOVC instructions executed from external program memory are disabled from fetching code bytes from internal memory. Block erase is disabled. Erase or programming of the status byte or boot vector is disabled. Verify of code memory is disabled. External execution is disabled. NOTE: 1. Security bits are independent of each other. Full-chip erase may be performed regardless of the state of the security bits. 1999 Sep 23 47 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 DIP40: plastic dual in-line package; 40 leads (600 mil) SOT129-1 1999 Sep 23 48 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 PLCC44: plastic leaded chip carrier; 44 leads SOT187-2 1999 Sep 23 49 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 QFP44: plastic quad flat package; 44 leads (lead length 1.3 mm); body 10 x 10 x 1.75 mm SOT307-2 1999 Sep 23 50 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 NOTES 1999 Sep 23 51 Philips Semiconductors Preliminary specification 80C51 8-bit Flash microcontroller family 16KB/32KB/64KB ISP/IAP Flash with 512B/512B/1KB RAM 89C51RB2/89C51RC2/ 89C51RD2 Data sheet status Data sheet status Objective specification Preliminary specification Product specification Product status Development Qualification Definition [1] This data sheet contains the design target or goal specifications for product development. Specification may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains final specifications. Philips Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. Production [1] Please consult the most recently issued datasheet before initiating or completing a design. Definitions Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition — Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Disclaimers Life support — These products are not designed for use in life support appliances, devices or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes — Philips Semiconductors reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088–3409 Telephone 800-234-7381 © Copyright Philips Electronics North America Corporation 1999 All rights reserved. Printed in U.S.A. Date of release: 09-99 Document order number: 9397–750–06427 Philips Semiconductors 1999 Sep 23 52