SNC12120

SNC12120 One Channel Speech Controller ===================== CONTENTS ===================== 1. 2. 3. 4. 5. INTRODUCTION............................................................................................................ 3 FEATURES ...................................................................................................................... 3 PIN ASSIGNMENT ......................................................................................................... 3 BLOCK DIAGRAM ........................................................................................................ 4 FUNCTION DESCRIPTIONS ....................................................................................... 4 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 6. 7. 8. OSCILLATOR ............................................................................................................... 4 ROM .......................................................................................................................... 4 RAM .......................................................................................................................... 5 POWER DOWN MODE .................................................................................................. 5 SAMPLING RATE COUNTER ......................................................................................... 5 I/O PORTS ................................................................................................................... 5 PUSH-PULL OUTPUT ................................................................................................... 6 WATCH DOG TIMER .................................................................................................... 6 IR FUNCTION .............................................................................................................. 6 ABSOLUTE MAXIMUM RATING .............................................................................. 6 ELECTRICAL CHARACTERISTICS ......................................................................... 7 APPLICATION CIRCUIT ............................................................................................. 8 Ver: 1.4 1 March 17, 2005 SNC12120 One Channel Speech Controller AMENDENT HISTORY Version Ver 1.3 Ver 1.4 Date January 14, 2005 March 17,2005 First issue SNC12120, 12168, 12268 12340 Provide 128*4 RAM Modify Standby & operation current Ver 1.5 May 25, 2005 Remove APPLICATION CIRCUIT RST pin capacitance Add IR Description Description Ver: 1.4 2 March 17, 2005 SNC12120 One Channel Speech Controller 1. INTRODUCTION SNC12120 is a one-channel voice synthesizer IC with Push-Pull direct drive circuit. It built in a 4-bit tiny controller with four 4-bit I/O ports. By programming through the tiny controller in SNC12120, user’s varied applications including voice section combination, key trigger arrangement, output control, and other logic functions can be easily implemented. 2. FEATURES Single power supply 2.4V – 5.5V 120 seconds voice capacity are provided (@6KHZ sample rate) Built in a 4-bit tiny controller I/O Port − Four 4-bit I/O ports P1, P2, P3 and P6 are provided. − The driving/sink current of P3.2 & P3.3 is up to 8mA/16mA − The IO pins P3.3 can be modulated with 38.5Khz carry signal to implement IR function. 128*4 bits RAM are provided Maximum 16k program ROM is provided 384K*10 shared ROM for voice data and program Readable ROM code data Built in one channel speech synthesizer Adaptive playing speed from 2.5k-20kHz is provided Built in an 8-level volume control Push-Pull Direct Drive circuit output, can directly connected to Speaker for sound output. System clock: 2MHz Event Mark function supported Low Power Reset Watch Dog Timer Supported 3. PIN ASSIGNMENT Symbol P10~P13 P20~P23 P30~P33 P60~P63 Rosc BUO1 BUO2 RST VDD GND Ver: 1.4 I/O I/O I/O I/O I/O I O O I I I Function Description I/O port 1: IO I/O port 2: IO I/O port 3: IO I/O port 6: IO Oscillation component connection pin Push-Pull output 1 Push-Pull output 2 RST=1 Reset Chip (Active H) Positive power supply Negative power supply 3 March 17, 2005 SNC12120 One Channel Speech Controller Test I Test pin 4. Block Diagram ROM Program/Speech 384K×10 bits Address Pointers/ STACK SRAM (128 nibbles) Timer ALU IO port 1 IO port 2 Timing Generator OSC Sampling Rate Counter Watch Dog Timer Push-Pull Circuit IO port 6 Voice Synthesizer IO port 3 5. FUNCTION DESCRIPTIONS 5.1 Oscillator SNC12120 accepts RC type oscillator for system clock. The typical circuit diagram for oscillator is listed as follows. VCC RC Oscillator 5.2 ROM SNC12120 contains a substantial 384K words (10-bit) internal ROM, which is shared by program and resource data. Program, voice and data are shared within this same 384K words ROM. Ver: 1.4 4 r March 17, 2005 OSC SNC12120 One Channel Speech Controller 5.3 RAM SNC12120 contains 128 nibble RAM (128 x 4-bits). The 128 nibble RAM is divided into eight pages (page 0 to page 7, 16 nibble RAM on each page). In our programming structure, users can use the instructions, PAGE n (n=0 to 7) to switch and indicate the RAM page. Besides, users can use direct mode, M0 ~ M15 in the data transfer type instructions, to access all 16 nibbles of each page 5.4 Power Down Mode “End” instruction makes the IC entering into Stop Mode will stop the system clock for power savings (