XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
APRIL 2013
REV. 2.2.0
GENERAL DESCRIPTION
FEATURES
The XR16C8641 (864) is an enhanced quad
Universal Asynchronous Receiver and Transmitter
(UART) each with 128 bytes of transmit and receive
FIFOs, transmit and receive FIFO counters and
trigger levels, automatic hardware and software flow
control, automatic RS-485 half-duplex direction
control and data rates of up to 2 Mbps. Each UART
has a set of registers that provide the user with
operating status and control, receiver error
indications, and modem serial interface controls.
System interrupts may be tailored to meet design
requirements. An internal loopback capability allows
onboard diagnostics. The 864 is available in the 100pin QFP package. The XR16C864 offers faster
channel status access by providing separate outputs
for TXRDY and RXRDY, offer separate Infrared TX
outputs and a separate clock input for channel C
(CHCCLK). The XR16C864 is compatible with the
industry standard ST16C654 and XR16C854.
Added feature in devices with top mark date code of
"F2 YYWW" and newer:
NOTE:
■
5 volt tolerant inputs
• 2.97 to 5.5 Volt Operation
• Pin-to-pin compatible with the industry standard
ST16C654 and XR16C854
• Intel or Motorola Data Bus Interface select
• Four independent UART channels
1 Covered by U.S. Patent #5,649,122 and #5,949,787.
■
Register Set Compatible to 16C550
■
Data rates of up to 2 Mbps
■
Transmit and Receive FIFOs of 128 bytes
■
Programmable TX and RX FIFO Trigger Levels
■
Transmit and Receive FIFO Level Counters
■
Automatic Hardware (RTS/CTS) Flow Control
■
Selectable Auto RTS Flow Control Hysteresis
■
Automatic Software (Xon/Xoff) Flow Control
■
Wireless Infrared (IrDA 1.0) Encoder/Decoder
• Sleep Mode (200 uA typical)
• Crystal oscillator or external clock input
APPLICATIONS
• Portable Appliances
• Telecommunication Network Routers
• Ethernet Network Routers
• Cellular Data Devices
• Factory Automation and Process Controls
FIGURE 1. XR16C864 BLOCK DIAGRAM
A 2 :A 0
5 V to le ra n t in p u ts (e x c e p t X T A L 1 )
D 7 :D 0
UART Channel A
1 2 8 B y te T X F IF O
UART
IO R #
IO W #
C S # A -D
IN T A -D
T X R D Y # A -D
R X R D Y # A -D
R eset
1 6 /6 8 #
IN T S E L
CLKSEL
CHCCLK
TC
AEN
D A C K A -D
T X D R Q # A -D
R X D R Q # A -D
XTAL1
XTAL2
B C L K A -D
TX & RX
T X A , R X A , IR T X A , D T R A # ,
DSRA#, RTSA#, CTSA#,
C D A # , R IA # , O P 2 A # ,
O P 1 A # /R S -4 8 5
UART Channel B
(s a m e a s C h a n n e l A )
T X B , R X B , IR T X B , D T R B # ,
DSRB#, RTSB#, CTSB#,
C D B # , R IB # , O P 2 B # ,
O P 1 B # /R S -4 8 5
Regs
In te l o r
M o to ro la
D a ta B u s
In te r fa c e
BRG
IR
ENDEC
1 2 8 B y te R X F IF O
UART Channel C
(s a m e a s C h a n n e l A )
D ire c t
M e m o ry
A ccess
UART Channel D
(s a m e a s C h a n n e l A )
C ry s ta l O s c /B u ffe r
2 .9 7 V to 5 .5 V V C C
T X C , R X C , IR T X C , D T R C # ,
DSRC#, RTSC#, CTSC#,
C D C # , R IC # , O P 2 C # ,
O P 1 C # /R S -4 8 5
T X D , R X D , IR T X D , D T R D # ,
DSRD#, RTSD#, CTSD#,
C D D # , R ID # , O P 2 D # ,
O P 1 D # /R S -4 8 5
854 BLK
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510) 668-7000 • FAX (510) 668-7017 • www.exar.com
20
21
22
23
24
25
26
27
28
29
30
GND
DTRB#
CTSB#
DSRB#
IRTXB
TXRDYB#
DACKB
AEN
OP1B#/RS-485
OP2B#
BCLKB
15
R/W#
19
14
TXA
RTSB#
13
CS#
18
12
IRQ#
N.C.
11
RTSA#
17
10
VCC
A3
9
DTRA#
16
8
CTSA#
TXB
7
5
TXRDYA#/TXDRQA#
6
4
DACKA
IRTXA
3
OP1A#/RS-485
DSRA#
2
81
50
RXRDYC#/RXDRQC
82
49
CDC#
CDD#
83
48
RIC#
RID#
84
47
RXC
RXD
85
46
GND
VCC
86
45
TXRDY#
GND
87
44
RXRDY#
D0
88
43
RESET#
D1
89
42
CHCCLK
D2
90
41
XTAL2
D3
91
40
XTAL1
D4
92
39
A0
D5
93
38
A1
D6
94
37
A2
D7
95
36
16/68#
GND
96
35
CLKSEL
RXA
97
34
RXB
RIA#
98
33
RIB#
99
32
CDB#
100
31
RXRDYB#/RXDRQB
CDA#
1
TXRDYD#/TXDRQD
RXRDYD#/RXDRQD
RXRDYA#/RXDRQA
OP2A#
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
DACKA
TXRDYA#/TXDRQA#
IRTXA
DSRA#
CTSA#
DTRA#
VCC
RTSA#
INTA
CSA#
TXA
IOW#
TXB
CSB#
INTB
RTSB#
GND
DTRB#
CTSB#
DSRB#
IRTXB
TXRDYB#
DACKB
AEN
OP1B#/RS-485
OP2B#
BCLKB
DACKD
FSRS#
IRTXD
DSRD#
CTSD#
DTRD#
GND
RTSD#
N.C.
N.C.
TXD
N.C.
TXC
A4
N.C.
RTSC#
VCC
DTRC#
CTSC#
DSRC#
IRTXC
TXRDYC#/TXDRQC
DACKC
TC
OP1C#/RS-485
OP2C#
BCLKC
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
77
3
OP1A#/RS-485
OP1#/RS485
2
78
1
OP2A#
OP2D#
79
BCLKA
BCLKD
80
CDA#
BCLKA
DACKD
FSRS#
IRTXD
DSRD#
CTSD#
DTRD#
GND
RTSD#
INTD
CSD#
TXD
IOR#
TXC
CSC#
INTC
RTSC#
VCC
DTRC#
CTSC#
DSRC#
IRTXC
TXRDYC#/TXDRQC
DACKC
TC
OP1C#/RS-485
OP2C#
BCLKC
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
OP1#/RS485
78
76
OP2D#
79
77
BCLKD
80
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 2. XR16C864 PIN OUT ASSIGNMENT IN 16 AND 68 MODE
TXRDYD#/TXDRQD
81
50
RXRDYC#/RXDRQC
RXRDYD#/RXDRQD
82
49
CDC#
CDD#
83
48
RIC#
RID#
84
47
RXC
RXD
85
46
GND
VCC
86
45
TXRDY#
INTSEL
87
44
RXRDY#
D0
88
43
RESET
D1
89
42
CHCCLK
D2
90
41
XTAL2
D3
91
40
XTAL1
D4
92
39
A0
D5
93
38
A1
D6
94
37
A2
D7
95
36
16/68#
GND
96
35
CLKSEL
RXA
97
34
RXB
RIA#
98
33
RIB#
XR16C864
100-pin QFP
16 Mode
Connect 16/68# pin to VCC
99
32
CDB#
RXRDYA#/RXDRQA
100
31
RXRDYB#/RXDRQB
XR16C864
100-pin QFP
68 Mode
Connect 16/68# pin to GND
2
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
ORDERING INFORMATION
PART NUMBER
PACKAGE
OPERATING TEMPERATURE RANGE
DEVICE STATUS
XR16C864CQ-F
100-Lead QFP
0°C to +70°C
Active
XR16C864CQTR-F
100-Lead QFP
0°C to +70°C
Active
XR16C864IQ-F
100-Lead QFP
-40°C to +85°C
Active
XR16C864IQTR-F
100-Lead QFP
-40°C to +85°C
Active
NOTE: TR = Tape and Reel, -F = Green / RoHS
PIN DESCRIPTIONS
Pin Description
NAME
100-QFP
TYPE
PIN #
DESCRIPTION
DATA BUS INTERFACE
A2
A1
A0
37
38
39
I
Address data lines [2:0]. These 3 address lines select one of the internal registers in
UART channels A-D during a data bus transaction.
D7
D6
D5
D4
D3
D2
D1
D0
95
94
93
92
91
90
89
88
I/O
IOR#
(N.C.)
66
I
When 16/68# pin is at logic 1, the Intel bus interface is selected and this input becomes
read strobe (active low). The falling edge instigates an internal read cycle and retrieves
the data byte from an internal register pointed by the address lines [A2:A0], puts the data
byte on the data bus to allow the host processor to read it on the rising edge.
When 16/68# pin is at logic 0, the Motorola bus interface is selected and this input is not
used.
IOW#
(R/W#)
15
I
When 16/68# pin is at logic 1, it selects Intel bus interface and this input becomes write
strobe (active low). The falling edge instigates the internal write cycle and the rising edge
transfers the data byte on the data bus to an internal register pointed by the address lines.
When 16/68# pin is at logic 0, the Motorola bus interface is selected and this input
becomes read (logic 1) and write (logic 0) signal.
CSA#
(CS#)
13
I
When 16/68# pin is at logic 1, this input is chip select A (active low) to enable channel A in
the device.
When 16/68# pin is at logic 0, this input becomes the chip select (active low) for the
Motorola bus interface.
CSB#
(A3)
17
I
When 16/68# pin is at logic 1, this input is chip select B (active low) to enable channel B in
the device.
When 16/68# pin is at logic 0, this input becomes address line A3 which is used for channel selection in the Motorola bus interface.
Data bus lines [7:0] (bidirectional).
3
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
Pin Description
NAME
100-QFP
TYPE
PIN #
DESCRIPTION
CSC#
(A4)
64
I
When 16/68# pin is at logic 1, this input is chip select C (active low) to enable channel C
in the device.
When 16/68# pin is at logic 0, this input becomes address line A4 which is used for channel selection in the Motorola bus interface.
CSD#
(N.C.)
68
I
When 16/68# pin is at logic 1, this input is chip select D (active low) to enable channel D
in the device.
When 16/68# pin is at logic 0, this input is not used.
INTA
(IRQ#)
12
INTB
INTC
INTD
(N.C.)
18
63
69
O
When 16/68# pin is at logic 1 for Intel bus interface, these ouputs become the interrupt
outputs for channels B, C, and D. The output state is defined by the user through the software setting of MCR[3]. The interrupt outputs are set to the active mode when MCR[3] is
set to a logic 1 and are set to the three state mode when MCR[3] is set to a logic 0
(default). See MCR[3].
When 16/68# pin is at logic 0 for Motorola bus interface, these outputs are unused and
will stay at logic zero level. Leave these outputs unconnected.
INTSEL
87
I
Interrupt Select (active high, input with internal pull-down).
When 16/68# pin is at logic 1 for Intel bus interface, this pin can be used in conjunction
with MCR bit-3 to enable or disable the INT A-D pins or override MCR bit-3 and enable
the interrupt outputs. Interrupt outputs are enabled continuously by making this pin a
logic 1. Making this pin a logic 0 allows MCR bit-3 to enable and disable the interrupt output pins. In this mode, MCR bit-3 is set to a logic 1 to enable the continuous output. See
MCR bit-3 description for full detail. This pin must be at logic 0 in the Motorola bus interface mode.
TXRDYA#
TXRDYB#
TXRDYC#
TXRDYD#
5
25
56
81
O
UART channels A-D Transmitter Ready (active low). These outputs provide the TX FIFO/
THR status for transmit channels A-D. See Table 5. If Direct Memory Access is enabled,
these outputs become Transmit Direct Memory Access Request outputs. See TXDRQ pin
description for more details. If these outputs are unused, leave them unconnected.
RXRDYA#
RXRDYB#
RXRDYC#
RXRDYD#
100
31
50
82
O
UART channels A-D Receiver Ready (active low). These outputs provide the RX FIFO/
RHR status for receive channels A-D. See Table 5. If Direct Memory Access is enabled,
these outputs become Receive Direct Memory Access Request outputs. See RXDRQ pin
description for more details. If these outputs are unused, leave them unconnected.
TXRDY#
45
O
Transmitter Ready (active low). This output is a logically wire-ORed status of TXRDY#
A-D. See Table 5. If this output is unused, leave it unconnected.
RXRDY#
44
O
Receiver Ready (active low). This output is a logically wire-ORed status of RXRDY# A-D.
See Table 5. If this output is unused, leave it unconnected.
O When 16/68# pin is at logic 1 for Intel bus interface, this ouput becomes channel A inter(OD) rupt output. The output state is defined by the user and through the software setting of
MCR[3]. INTA is set to the active mode when MCR[3] is set to a logic 1. INTA is set to the
three state mode when MCR[3] is set to a logic 0 (default). See MCR[3].
When 16/68# pin is at logic 0 for Motorola bus interface, this output becomes device interrupt output (active low, open drain). An external pull-up resistor is required for proper
operation.
4
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
Pin Description
NAME
FSRS#
100-QFP
TYPE
PIN #
76
I
DESCRIPTION
FIFO Status Register Select (active low input with internal pull-up).
The content of the FSTAT register is placed on the data bus when this pin becomes
active. However it should be noted, D0-D3 contain the inverted logic states of TXRDY#
A-D pins, and D4-D7 the logic states (un-inverted) of RXRDY# A-D pins. Address line is
not required when reading this status register.
DIRECT MEMORY ACCESS INTERFACE
TC
54
I
Direct Memory Access Terminal Count. A high pulse terminates a Direct Memory Access
transaction. If Direct Memory Access is not used, this input should be connected to GND.
AEN
27
I
Address Enable for Direct Memory Access. A high at this input indicates a valid Direct
Memory Access cycle. See DACK pin descriptions below for Direct Memory Access cycle
description. If Direct Memory Access is not used, this input should be connected to GND.
DACKA
DACKB
DACKC
DACKD
4
26
55
77
I
Direct Memory Access Acknowledge. Direct Memory Access cycle will start processing
when CPU/Host sets this input low and AEN high. All writes will be to the TX FIFO and all
reads will be from the RX FIFO. A0-A2 and CS# A-D will be ignored. If Direct Memory
Access is not used, these inputs should be connected to VCC.
TXDRQA
TXDRQB
TXDRQC
TXDRQD
5
25
56
81
O
Transmit Direct Memory Access Request. A transmit empty request is indicated by a high
level on TXDRQ. The TXDRQ line is held high until either TC pulses or the TX FIFO is
filled above its trigger level. Transmit Direct Memory Access Request is enabled by setting EMSR register bit-2 = 1. If Direct Memory Access is not used, leave these outputs
unconnected.
RXDRQA
RXDRQB
RXDRQC
RXDRQD
100
31
50
82
O
Receive Direct Memory Access Request. A Receive ready request is indicated by a high
level on RXDRQ. The RXDRQ line is held high until either TC pulses or the RX FIFO is
emptied. Receive Direct Memory Access Request is enabled by setting EMSR register
bit-3 = 1. If Direct Memory Access is not used, leave these outputs unconnected.
MODEM OR SERIAL I/O INTERFACE
TXA
TXB
TXC
TXD
14
16
65
67
O
UART channels A-D Transmit Data and infrared transmit data. Standard transmit and
receive interface is enabled when MCR[6] = 0. In this mode, the TX signal will be a logic
1 during reset, or idle (no data). Infrared IrDA transmit and receive interface is enabled
when MCR[6] = 1. In the Infrared mode, the inactive state (no data) for the Infrared
encoder/decoder interface is a logic 0.
IRTXA
IRTXB
IRTXC
IRTXD
6
24
57
75
O
UART channels A-D Infrared Transmit Data. The inactive state (no data) for the Infrared
encoder/decoder interface is a logic 0. Regardless of the logic state of MCR bit-6, this pin
will be operating in the Infrared mode.
RXA
RXB
RXC
RXD
97
34
47
85
I
UART channels A-D Receive Data or infrared receive data. Normal receive data input
must idle at logic 1 condition. The infrared receiver pulses typically idles at logic 0 but can
be inverted by software control prior going in to the decoder, see FCTR[2].
RTSA#
RTSB#
RTSC#
RTSD#
11
19
62
70
O
UART channels A-D Request-to-Send (active low) or general purpose output. This output
must be asserted prior to using auto RTS flow control, see EFR[6], MCR[1], FCTR[1:0],
EMSR[5:4] and IER[6]. Also see Figure 10. If these outputs are not used, leave them
unconnected.
5
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
Pin Description
NAME
100-QFP
TYPE
PIN #
DESCRIPTION
CTSA#
CTSB#
CTSC#
CTSD#
8
22
59
73
I
UART channels A-D Clear-to-Send (active low) or general purpose input. It can be used
for auto CTS flow control, see EFR[7], and IER[7]. Also see Figure 10. These inputs
should be connected to VCC when not used.
DTRA#
DTRB#
DTRC#
DTRD#
9
21
60
72
O
UART channels A-D Data-Terminal-Ready (active low) or general purpose output. If
these outputs are not used, leave them unconnected.
DSRA#
DSRB#
DSRC#
DSRD#
7
23
58
74
I
UART channels A-D Data-Set-Ready (active low) or general purpose input. This input
should be connected to VCC when not used.
CDA#
CDB#
CDC#
CDD#
99
32
49
83
I
UART channels A-D Carrier-Detect (active low) or general purpose input. This input
should be connected to VCC when not used.
RIA#
RIB#
RIC#
RID#
98
33
48
84
I
UART channels A-D Ring-Indicator (active low) or general purpose input. This input
should be connected to VCC when not used.
OP1A#
OP1B#
OP1C#
OP1D#
3
28
53
78
O
General purpose output or RS-485 direction control signal. RS-485 direction control can
be selected via FCTR bit-3. SEE”AUTO RS485 HALF-DUPLEX CONTROL” ON
PAGE 20. If these outputs are unused, leave them unconnected.
OP2A#
OP2B#
OP2C#
OP2D#
2
29
52
79
O
General purpose output. If these outputs are unused, leave them unconnected.
ANCILLARY SIGNALS
XTAL1
40
I
Crystal or external clock input. This input is not 5V tolerant.
XTAL2
41
O
Crystal or buffered clock output.
BCLKA
BCLKB
BCLKC
BCLKD
1
30
51
80
O
Baud Rate Generator Output. The baud rate generator clock output is internally connected to the RCLK input. This pin provides the 16X clock of the selected data rate from
the baud rate generator.
16/68#
36
I
Intel or Motorola Bus Select (input with internal pull-up).
When 16/68# pin is at logic 1, 16 or Intel Mode, the device will operate in the Intel bus
type of interface.
When 16/68# pin is at logic 0, 68 or Motorola mode, the device will operate in the Motorola bus type of interface.
6
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
Pin Description
NAME
100-QFP
TYPE
PIN #
DESCRIPTION
CLKSEL
35
I
Baud-Rate-Generator Input Clock Prescaler Select for channels A-D. This input is only
sampled during power up or a reset. Connect to VCC for divide by 1 and GND for divide
by 4. MCR[7] can override the state of this pin following a reset or initialization. See MCR
bit-7 and Figure 5 in the Baud Rate Generator section.
CHCCLK
42
I
This input provides the clock for UART channel C. An external 16X baud clock or the
crystal oscillator’s output, XTAL2, must be connected to this pin for normal operation.
This input may also be used with MIDI (Musical Instrument Digital Interface) applications
when an external MIDI clock is provided.
RESET
(RESET#)
43
I
When 16/68# pin is at logic 1 for Intel bus interface, this input becomes the Reset pin
(active high). In this case, a 40 ns minimum logic 1 pulse on this pin will reset the internal
registers and all outputs. The UART transmitter output will be held at logic 1, the receiver
input will be ignored and outputs are reset during reset period (Table 19). When 16/68#
pin is at a logic 0 for Motorola bus interface, this input becomes Reset# pin (active low).
This pin functions similarly, but instead of a logic 1 pulse, a 40 ns minimum logic 0 pulse
will reset the internal registers and outputs.
VCC
10, 61,
86
Pwr 2.97V to 5.5V power supply. All input pins, except XTAL1, are 5V tolerant.
GND
20, 46,
71, 96
Pwr Power supply common, ground.
Pin type: I=Input, O=Output, I/O= Input/output, OD=Output Open Drain.
Factory Test Mode
If the IOR#, IOW# and CS# pins are all asserted (at a logic 0), the 864 will enter a Factory Test Mode.
7
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
1.0 PRODUCT DESCRIPTION
The XR16C864 (864) integrates the functions of 4 enhanced 16C550 Universal Asynchronous Receiver and
Transmitter (UART). Each UART is independently controlled having its own set of device configuration
registers. The configuration registers set is 16550 UART compatible for control, status and data transfer.
Additionally, each UART channel has 128-bytes of transmit and receive FIFOs, automatic RTS/CTS hardware
flow control with hysteresis control, automatic Xon/Xoff and special character software flow control,
programmable transmit and receive FIFO trigger levels, FIFO level counters, infrared encoder and decoder
(IrDA ver 1.0), programmable baud rate generator with a prescaler of divide by 1 or 4, and data rate up to 2
Mbps. The XR16C864 can operate at 3.3 or 5 volts. The 864 is fabricated with an advanced CMOS process.
Enhanced FIFO
The 864 QUART provides a solution that supports 128 bytes of transmit and receive FIFO memory, instead of
64 bytes provided in the ST16C654 and 16 bytes in the ST16C554, or one byte in the ST16C454. The 864 is
designed to work with high performance data communication systems, that require fast data processing time.
Increased performance is realized in the 864 by the larger transmit and receive FIFOs, FIFO trigger level
control, FIFO level counters and automatic flow control mechanism. This allows the external processor to
handle more networking tasks within a given time. For example, the ST16C554 with a 16 byte FIFO, unloads
16 bytes of receive data in 1.53 ms (This example uses a character length of 11 bits, including start/stop bits at
115.2Kbps). This means the external CPU will have to service the receive FIFO at 1.53 ms intervals. However
with the 128 byte FIFO in the 864, the data buffer will not require unloading/loading for 12.2 ms. This increases
the service interval giving the external CPU additional time for other applications and reducing the overall
UART interrupt servicing time. In addition, the programmable FIFO level trigger interrupt and automatic
hardware/software flow control is uniquely provided for maximum data throughput performance especially
when operating in a multi-channel system. The combination of the above greatly reduces the CPU’s bandwidth
requirement, increases performance, and reduces power consumption.
Data Rate
The 864 is capable of operation up to 2 Mbps at 5V with 16x internal sampling clock rate. The device can
operate with a crystal oscillator of up to 24 MHz crystal on pins XTAL1 and XTAL2, or external clock source of
32 MHz on XTAL1 pin. With a typical crystal of 14.7456 MHz and through a software option, the user can set
the prescaler bit for data rates of up to 921.6 kbps.
Enhanced Features
The rich feature set of the 864 is available through the internal registers. Automatic hardware/software flow
control, selectable transmit and receive FIFO trigger levels, selectable baud rates, infrared encoder/decoder
interface, modem interface controls, and a sleep mode are all standard features. MCR bit-5 provides a facility
for turning off software flow control with any incoming (RX) character. In the 16 mode INTSEL and MCR bit-3
can be configured to provide a software controlled or continuous interrupt capability.
The XR16C864 offers a clock prescaler select pin to allow system/board designers to preset the default baud
rate table on power up. The CLKSEL pin selects the div-by-1 or div-by-4 prescaler for the baud rate generator.
It can then be overridden following initializatioin by MCR bit-7.
The 864 offers several other enhanced features. These features include a CHCCLK clock input, FSTAT
register, separate IrDA TX outputs, separate RXRDY and TXRDY outputs and a Direct Memory Access
interface. The CHCCLK must be connected to the XTAL2 pin for normal operation or to external MIDI (Music
Instrument Digital Interface) oscillator for MIDI applications. A separate register (FSTAT) is provided for
monitoring the real time status of the FIFO signals TXRDY# and RXRDY# for each of the four UART channels
(A-D). Separate TXRDY and RXRDY outputs for the individual channels are also provided. For infrared
applications, four separate IrDA (Infrared Data Association Standard) TX outputs are provided. These outputs
are provided in addition to the standard asynchronous modem data outputs.
A full Direct Memory Access interface is provided with separate DRQ lines for RX and TX FIFOs of the
individual channels.
8
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
2.0 FUNCTIONAL DESCRIPTIONS
2.1
CPU Interface
The CPU interface is 8 data bits wide with 3 address lines and control signals to execute data bus read and
write transactions. The 864 data interface supports the Intel compatible types of CPUs and it is compatible to
the industry standard 16C550 UART. No clock (oscillator nor external clock) is required to operate a data bus
transaction. Each bus cycle is asynchronous using CS# A-D, IOR# and IOW# or CS#, R/W#, A4 and A3 inputs.
All four UART channels share the same data bus for host operations. A typical data bus interconnection for
Intel and Motorola mode is shown in Figure 3.
FIGURE 3. XR16C864 TYPICAL INTEL/MOTOROLA DATA BUS INTERCONNECTIONS
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A0
A1
A2
VCC
VCC
TXA
RXA
UART
Channel A
DTRA#
RTSA#
CTSA#
Serial Interface of
RS-232
DSRA#
CDA#
RIA#
IOR#
IOR#
IOW#
IOW#
UART_CSA#
UART_CSB#
UART_CSC#
UART_CSD#
CSA#
CSB#
CSC#
CSD#
UART_INTA
INTA
UART_INTB
INTB
UART_INTC
INTC
UART_INTD
INTD
UART_RESET
UART
Channel B
UART
Channel C
UART
Channel D
Similar
to Ch A
Serial Interface of
RS-232
Similar
to Ch A
Similar
to Ch A
RESET
VCC
GND
16/68#
Intel Data Bus (16 Mode) Interconnections
VCC
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
A0
A1
A2
A0
A1
CTSA#
DSRA#
CDA#
A2
RIA#
A3
A4
CSB#
CSC#
CSD#
VCC
R/W#
IOR#
IOW#
UART_CS#
CSA#
UART_IRQ#
INTA
VCC
(no connect)
(no connect)
(no connect)
UART_RESET#
INTB
INTC
INTD
UART
Channel A
UART
Channel B
UART
Channel C
UART
Channel D
DTRA#
RTSA#
Similar
to Ch A
Similar
to Ch A
GND
Motorola Data Bus (68 Mode) Interconnections
9
Serial Interface of
RS-232
Similar
to Ch A
RESET#
16/68#
VCC
TXA
RXA
Serial Interface of
RS-232
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.2
REV. 2.2.0
5-Volt Tolerant Inputs
For devices that have top mark date code "F2 YYWW" and newer, the 864 can accept a voltage of up to 5.5V
on any of its inputs (except XTAL1) when operating from 2.97V to 5.5V. XTAL1 is not 5 volt tolerant. Devices
that have top mark date code "DC YYWW" and older do not have 5V tolerant inputs.
2.3
Device Reset
The RESET input resets the internal registers and the serial interface outputs in all four channels to their
default state (see Table 19). An active high pulse of longer than 40 ns duration will be required to activate the
reset function in the device. Following a power-on reset or an external reset, the 864 is software compatible
with previous generation of UARTs, 16C454 and 16C554 and 16C654.
2.4
Device Identification and Revision
The XR16C864 provides a Device Identification code and a Device Revision code to distinguish the part from
other devices and revisions. To read the identification code from the part, it is required to set the baud rate
generator registers DLL and DLM both to 0x00. Now reading the content of the DLM will provide 0x14 for the
XR16C864 and reading the content of DLL will provide the revision of the part; for example, a reading of 0x01
means revision A.
2.5
Channel Selection
The UART provides the user with the capability to bi-directionally transfer information between an external
CPU and an external serial communication device. During Intel Bus Mode (16/68# pin is connected to VCC), a
logic 0 on chip select pins, CSA#, CSB#, CSC# or CSD# allows the user to select UART channel A, B, C or D
to configure, send transmit data and/or unload receive data to/from the UART. Selecting all four UARTs can be
useful during power up initialization to write to the same internal registers, but do not attempt to read from all
four uarts simultaneously. Individual channel select functions are shown in Table 1.
TABLE 1: CHANNEL A-D SELECT IN 16 MODE
CSA#
CSB#
CSC#
CSD#
FUNCTION
1
1
1
1
UART de-selected
0
1
1
1
Channel A selected
1
0
1
1
Channel B selected
1
1
0
1
Channel C selected
1
1
1
0
Channel D selected
0
0
0
0
Channels A-D selected
During Motorola Bus Mode (16/68# pin is connected to GND), the package interface pins are configured for
connection with Motorola, and other popular microprocessor bus types. In this mode the 864 decodes two
additional addresses, A3 and A4, to select one of the four UART ports. The A3 and A4 address decode
function is used only when in the Motorola Bus Mode. See Table 2.
TABLE 2: CHANNEL A-D SELECT IN 68 MODE
CS#
A4
A3
FUNCTION
1
N/A
N/A
UART de-selected
0
0
0
Channel A selected
0
0
1
Channel B selected
0
1
0
Channel C selected
0
1
1
Channel D selected
10
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
2.6
Channels A-D Internal Registers
Each UART channel in the 864 has a set of enhanced registers for control, monitoring and data loading and
unloading. The configuration register set is compatible to those already available in the standard single
16C550. These registers function as data holding registers (THR/RHR), interrupt status and control registers
(ISR/IER), a FIFO control register (FCR), receive line status and control registers (LSR/LCR), modem status
and control registers (MSR/MCR), programmable data rate (clock) divisor registers (DLL/DLM), and a user
accessible scratchpad register (SPR).
Beyond the general 16C550 features and capabilities, the 864 offers enhanced feature registers (EMSR, FLVL,
EFR, Xon/Xoff 1, Xon/Xoff 2, FCTR, TRG, FC) that provide automatic RTS and CTS hardware flow control,
Xon/Xoff software flow control, automatic RS-485 half-duplex direction output enable/disable, FIFO trigger
level control, and FIFO level counters. All the register functions are discussed in full detail later in “Section
3.0, UART Internal Registers” on page 23.
2.7
INT Ouputs for Channels A-D
The interrupt outputs change according to the operating mode and enhanced features setup. Table 3 and 4
summarize the operating behavior for the transmitter and receiver. Also see Figure 19 through 23.
TABLE 3: INT PINS OPERATION FOR TRANSMITTER FOR CHANNELS A-D
FCTR
Bit-3
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
FCR Bit-3 = 0
(DMA Mode Disabled)
FCR Bit-3 = 1
(DMA Mode Enabled)
INT Pin
0
0 = a byte in THR
1 = THR empty
0 = FIFO above trigger level
0 = FIFO above trigger level
1 = FIFO below trigger level or FIFO 1 = FIFO below trigger level or FIFO
empty
empty
INT Pin
1
0 = a byte in THR
1 = transmitter empty
0 = FIFO above trigger level
0 = FIFO above trigger level
1 = FIFO below trigger level or 1 = FIFO below trigger level or
transmitter empty
transmitter empty
TABLE 4: INT PIN OPERATION FOR RECEIVER FOR CHANNELS A-D
FCR BIT-0 = 0
(FIFO DISABLED)
FCR BIT-0 = 1 (FIFO ENABLED)
FCR Bit-3 = 0
(DMA Mode Disabled)
INT Pin
0 = no data
1 = 1 byte
0 = FIFO below trigger level
1 = FIFO above trigger level
11
FCR Bit-3 = 1
(DMA Mode Enabled)
0 = FIFO below trigger level
1 = FIFO above trigger level
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.8
REV. 2.2.0
Direct Memory Access
In this document, Direct Memory Access will not be referred to by its acronym (DMA) to avoid confusion with
DMA Mode (a legacy term) that refers to data block transfer operation. Direct Memory Access mode is enabled
via EMSR bits 2 and 3. The Direct Memory Access transaction is controlled through the RXDRQ [A-D],
TXDRQ [A-D], DACK [A-D], AEN and TC pins.
2.9
DMA Mode
The DMA Mode (a legacy term) in this document doesn’t mean “direct memory access” but refers to data block
transfer operation. (Since the 864 also supports Direct Memory Access, “Direct Memory Access” will be used
instead of “DMA” when explaining Direct Memory Access.) The DMA mode affects the state of the RXRDY# AD and TXRDY# A-D output pins. The transmit and receive FIFO trigger levels provide additional flexibility to the
user for block mode operation. The LSR bits 5-6 provide an indication when the transmitter is empty or has an
empty location(s) for more data. The user can optionally operate the transmit and receive FIFO in the DMA
mode (FCR bit-3=1). When the transmit and receive FIFO are enabled and the DMA mode is disabled (FCR
bit-3 = 0), the 864 is placed in single-character mode for data transmit or receive operation. When DMA mode
is enabled (FCR bit-3 = 1), the user takes advantage of block mode operation by loading or unloading the FIFO
in a block sequence determined by the programmed trigger level. The following table show their behavior. Also
see Figure 19 through 23.
TABLE 5: TXRDY# AND RXRDY# OUTPUTS IN FIFO AND DMA MODE FOR CHANNELS A-D
PINS
FCR BIT-0=0
(FIFO DISABLED)
FCR BIT-0=1 (FIFO ENABLED)
FCR Bit-3 = 0
(DMA Mode Disabled)
FCR Bit-3 = 1
(DMA Mode Enabled)
RXRDY#
0 = 1 byte
1 = no data
0 = at least 1 byte in FIFO
1 = FIFO empty
1 to 0 transition when FIFO reaches the trigger
level, or timeout occurs.
0 to 1 transition when FIFO empties.
TXRDY#
0 = THR empty
1 = byte in THR
0 = FIFO empty
1 = at least 1 byte in FIFO
0 = FIFO has at least 1 empty location.
1 = FIFO is full.
2.10
Crystal Oscillator or External Clock Input
The 864 includes an on-chip oscillator (XTAL1 and XTAL2) to produce a clock for all four UART sections in the
device. The CPU data bus does not require this clock for bus operation. The crystal oscillator provides a
system clock to the Baud Rate Generators (BRG) section found in each of the UART. XTAL1 is the input to the
oscillator or external clock buffer input with XTAL2 pin being the output. For programming details, see
“Programmable Baud Rate Generator.”
FIGURE 4. TYPICAL OSCILATOR CONNECTIONSL
R = 30 0 K to 40 0 K
X T A L1
1 4 .7 45 6
MHz
X T A L2
C2
2 2 -4 7 pF
C1
2 2 -47 p F
The on-chip oscillator is designed to use an industry standard microprocessor crystal (parallel resonant,
fundamental frequency with 10-22 pF capacitance load, ESR of 20-120 ohms and 100ppm frequency
12
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
tolerance) connected externally between the XTAL1 and XTAL2 pins (see Figure 4). Typical standard crystal
frequencies are: 1.8432, 3.6864, 7.3728, 14.7456, 18.432, and 22.1184 MHz. Alternatively, an external clock
can be connected to the XTAL1 pin to clock the internal baud rate generator for standard or custom rates.
Typical oscillator connections are shown in Figure 4. For further reading on oscillator circuit please see
application note DAN108 on EXAR’s web site.
2.11
Programmable Baud Rate Generator
Each UART has its own Baud Rate Generator (BRG) with a prescaler. The prescaler is controlled by a
software bit in the MCR register. The MCR register bit-7 sets the prescaler to divide the input crystal or external
clock by 1 or 4. The clock output of the prescaler goes to the BRG. The BRG further divides this clock by a
programmable divisor between 1 and (216 -1) to obtain a 16X sampling rate clock of the serial data rate. The
sampling rate clock is used by the transmitter for data bit shifting and receiver for data sampling.
FIGURE 5. BAUD RATE GENERATOR AND PRESCALER
DLL and DLM
R e g iste rs
P re s c a le r
D iv id e b y 1
M C R B it-7 = 0
(d e fa u lt)
C ry s ta l
O sc/
B u ffe r
XTAL1
XTAL2
16X
S a m p lin g
R a te C lo c k to
T ra n s m itte r
B a u d R a te
G e n e ra to r
L o g ic
P re s c a le r
D iv id e b y 4
M C R B it-7 = 1
Table 6 shows the standard data rates available with a 14.7456 MHz crystal or external clock at 16X sampling
rate. When using a non-standard frequency crystal or external clock, the divisor value can be calculated for
DLL/DLM with the following equation.
divisor (decimal) = (XTAL1 clock frequency / prescaler) / (serial data rate x 16)
TABLE 6: TYPICAL DATA RATES WITH A 14.7456 MHZ CRYSTAL OR EXTERNAL CLOCK
OUTPUT Data Rate OUTPUT Data Rate
DIVISOR FOR 16x DIVISOR FOR 16x
MCR Bit-7=1
MCR Bit-7=0
Clock (Decimal) Clock (HEX)
(DEFAULT)
100
600
1200
2400
4800
9600
19.2k
38.4k
57.6k
115.2k
230.4k
400
2400
4800
9600
19.2k
38.4k
76.8k
153.6k
230.4k
460.8k
921.6k
2304
384
192
96
48
24
12
6
4
2
1
900
180
C0
60
30
18
0C
06
04
02
01
13
DLM
PROGRAM
VALUE (HEX)
DLL
PROGRAM
VALUE (HEX)
DATA RATE
ERROR (%)
09
01
00
00
00
00
00
00
00
00
00
00
80
C0
60
30
18
0C
06
04
02
01
0
0
0
0
0
0
0
0
0
0
0
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.12
REV. 2.2.0
Transmitter
The transmitter section comprises of an 8-bit Transmit Shift Register (TSR) and 128 bytes of FIFO which
includes a byte-wide Transmit Holding Register (THR). TSR shifts out every data bit with the 16X internal
clock. A bit time is 16 clock periods. The transmitter sends the start-bit followed by the number of data bits,
inserts the proper parity-bit if enabled, and adds the stop-bit(s). The status of the TX FIFO and TSR are
reported in the Line Status Register (LSR bit-5 and bit-6).
2.12.1
Transmit Holding Register (THR) - Write Only
The transmit holding register is an 8-bit register providing a data interface to the host processor. The host
writes transmit data byte to the THR to be converted into a serial data stream including start-bit, data bits,
parity-bit and stop-bit(s). The least-significant-bit (Bit-0) becomes first data bit to go out. The THR is the input
register to the transmit FIFO of 128 bytes when FIFO operation is enabled by FCR bit-0. Every time a write
operation is made to the THR, the FIFO data pointer is automatically bumped to the next sequential data
location.
2.12.2
Transmitter Operation in non-FIFO Mode
The host loads transmit data to THR one character at a time. The THR empty flag (LSR bit-5) is set when the
data byte is transferred to TSR. THR flag can generate a transmit empty interrupt (ISR bit-1) when it is enabled
by IER bit-1. The TSR flag (LSR bit-6) is set when TSR becomes completely empty.
FIGURE 6. TRANSMITTER OPERATION IN NON-FIFO MODE
Data
Byte
Transm it
Holding
Register
(THR)
THR Interrupt (ISR bit-1)
Enabled by IER bit-1
16X
Clock
Transmit Shift Register (TSR)
M
S
B
L
S
B
TXNO FIFO1
2.12.3
Transmitter Operation in FIFO Mode
The host may fill the transmit FIFO with up to 128 bytes of transmit data. The THR empty flag (LSR bit-5) is set
whenever the TX FIFO is empty. The THR empty flag can generate a transmit empty interrupt (ISR bit-1) when
the FIFO becomes empty. The transmit empty interrupt is enabled by IER bit-1. The TSR flag (LSR bit-6) is set
when TSR/TX FIFO becomes empty.
14
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 7. TRANSMITTER OPERATION IN FIFO AND FLOW CONTROL MODE
RX FIFO
Data Byte
THR
THR Interrupt (ISR bit-1) falls
below the programmed Trigger
Level and then when becomes
empty. FIFO is Enabled by FCR
bit-0=1
Auto CTS Flow Control (CTS# pin)
Flow Control Characters
(Xoff1/2 and Xon1/2 Reg.
Auto Software Flow Control
16X Clock
Transmit Data Shift Register
(TSR)
T XF IF O 1
2.13
Receiver
The receiver section contains an 8-bit Receive Shift Register (RSR) and 128 bytes of FIFO which includes a
byte-wide Receive Holding Register (RHR). The RSR uses the 16X clock for timing. It verifies and validates
every bit on the incoming character in the middle of each data bit. On the falling edge of a start or false start bit,
an internal receiver counter starts counting at the 16X clock rate. After 8 clocks the start bit period should be at
the center of the start bit. At this time the start bit is sampled and if it is still a logic 0 it is validated. Evaluating
the start bit in this manner prevents the receiver from assembling a false character. The rest of the data bits
and stop bits are sampled and validated in this same manner to prevent false framing. If there were any
error(s), they are reported in the LSR register bits 2-4. Upon unloading the receive data byte from RHR, the
receive FIFO pointer is bumped and the error tags are immediately updated to reflect the status of the data
byte in RHR register. RHR can generate a receive data ready interrupt upon receiving a character or delay until
it reaches the FIFO trigger level. Furthermore, data delivery to the host is guaranteed by a receive data ready
time-out interrupt when data is not received for 4 word lengths as defined by LCR[1:0] plus 12 bits time. This is
equivalent to 3.7-4.6 character times. The RHR interrupt is enabled by IER bit-0.
2.13.1
Receive Holding Register (RHR) - Read-Only
The Receive Holding Register is an 8-bit register that holds a receive data byte from the Receive Shift
Register. It provides the receive data interface to the host processor. The RHR register is part of the receive
FIFO of 128 bytes by 11-bits wide, the 3 extra bits are for the 3 error tags to be reported in LSR register. When
the FIFO is enabled by FCR bit-0, the RHR contains the first data character received by the FIFO. After the
RHR is read, the next character byte is loaded into the RHR and the errors associated with the current data
byte are immediately updated in the LSR bits 2-4.
15
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 8. RECEIVER OPERATION IN NON-FIFO MODE
16X Clock
Receive Data Shift
Register (RSR)
Error
Tags in
LSR bits
4:2
Receive
Data Byte
and Errors
Receive Data
Holding Register
(RHR)
Data Bit
Validation
Receive Data Characters
RHR Interrupt (ISR bit-2)
RXFIFO1
FIGURE 9. RECEIVER OPERATION IN FIFO AND AUTO RTS FLOW CONTROL MODE
16X Clock
Receive Data Shift
Register (RSR)
Data Bit
Validation
Error Tags
(128-sets)
128 bytes by 11-bit
wide
FIFO
Receive
Data FIFO
Enable by EFR bit-6=1, MCR bit-1.
FIFO
Trigger=16
Error Tags in
LSR bits 4:2
Data fills to
24
Receive Data
Byte and Errors
Receive Data Characters
Example
- :RX FIFO trigger level selected at 16
bytes
(See Note Below)
Data falls to
RTS# re-asserts when data falls below the flow
8
control trigger level to restart remote transmitter.
RHR Interrupt (ISR bit-2) programmed for
desired FIFO trigger level.
FIFO is Enabled by FCR bit-0=1
RTS# de-asserts when data fills above the flow
control trigger level to suspend remote transmitter.
Enable by EFR bit-6=1, MCR bit-1.
Receive
Data
RXFIFO1
NOTE: Table-B selected as Trigger Table for Figure 9 (Table 11).
2.14
Auto RTS Hardware Flow Control
Automatic RTS hardware flow control is used to prevent data overrun to the local receiver FIFO. The RTS#
output is used to request remote unit to suspend/resume data transmission. The auto RTS flow control
features is enabled to fit specific application requirement (see Figure 10):
• Enable auto RTS flow control using EFR bit-6.
• The auto RTS function must be started by asserting RTS# output pin (MCR bit-1 to logic 1 after it is enabled).
If using the Auto RTS interrupt:
• Enable RTS interrupt through IER bit-6 (after setting EFR bit-4). The UART issues an interrupt when the
RTS# pin makes a transition from low to high: ISR bit-5 will be set to logic 1.
16
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
2.15
Auto RTS Hysteresis
The 864 has a new feature that provides flow control trigger hysteresis while maintaining compatibility with the
XR16C850, ST16C650A and ST16C550 family of UARTs. With the Auto RTS function enabled, an interrupt is
generated when the receive FIFO reaches the programmed RX trigger level. The RTS# pin will not be forced
to a logic 1 (RTS off), until the receive FIFO reaches the upper limit of the hysteresis level. The RTS# pin will
return to a logic 0 after the RX FIFO is unloaded to the lower limit of the hysteresis level. Under the above
described conditions, the 864 will continue to accept data until the receive FIFO gets full. The Auto RTS
function is initiated when the RTS# output pin is asserted to a logic 0 (RTS On). Table 15 shows the complete
details for the Auto RTS# Hysteresis levels. Please note that this table is for programmable trigger levels only
(Table D). The hysteresis values for Tables A-C are the next higher and next lower trigger levels in Tables A-C
(See Table 11).
2.16
Auto CTS Flow Control
Automatic CTS flow control is used to prevent data overrun to the remote receiver FIFO. The CTS# input is
monitored to suspend/restart the local transmitter. The auto CTS flow control feature is selected to fit specific
application requirement (see Figure 10):
• Enable auto CTS flow control using EFR bit-7.
If using the Auto CTS interrupt:
• Enable CTS interrupt through IER bit-7 (after setting EFR bit-4). The UART issues an interrupt when the
CTS# pin is de-asserted (logic 1): ISR bit-5 will be set to 1, and UART will suspend transmission as soon as
the stop bit of the character in process is shifted out. Transmission is resumed after the CTS# input is reasserted (logic 0), indicating more data may be sent.
17
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 10. AUTO RTS AND CTS FLOW CONTROL OPERATION
Local UART
UARTA
Remote UART
UARTB
Receiver FIFO
Trigger Reached
Auto RTS
Trigger Level
TXB
RTSA#
CTSB#
Auto CTS
Monitor
RXB
Receiver FIFO
Trigger Reached
TXA
Transmitter
CTSA#
Auto CTS
Monitor
RTSA#
RXA
RTSB#
Assert RTS# to Begin
Transmission
1
ON
Auto RTS
Trigger Level
10
OFF
ON
7
2
ON
CTSB#
Transmitter
3
8
OFF
6
Suspend
11
ON
TXB
Data Starts
Restart
9
4
RXA FIFO
INTA
(RXA FIFO
Interrupt)
Receive
Data
RX FIFO
Trigger Level
5
RTS High
Threshold
RTS Low
Threshold
12
RX FIFO
Trigger Level
RTSCTS1
The local UART (UARTA) starts data transfer by asserting RTSA# (1). RTSA# is normally connected to CTSB# (2) of
remote UART (UARTB). CTSB# allows its transmitter to send data (3). TXB data arrives and fills UARTA receive FIFO
(4). When RXA data fills up to its receive FIFO trigger level, UARTA activates its RXA data ready interrupt (5) and continues to receive and put data into its FIFO. If interrupt service latency is long and data is not being unloaded, UARTA
monitors its receive data fill level to match the upper threshold of RTS delay and de-assert RTSA# (6). CTSB# follows
(7) and request UARTB transmitter to suspend data transfer. UARTB stops or finishes sending the data bits in its transmit shift register (8). When receive FIFO data in UARTA is unloaded to match the lower threshold of RTS delay (9),
UARTA re-asserts RTSA# (10), CTSB# recognizes the change (11) and restarts its transmitter and data flow again until
next receive FIFO trigger (12). This same event applies to the reverse direction when UARTA sends data to UARTB
with RTSB# and CTSA# controlling the data flow.
18
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
2.17
Auto Xon/Xoff (Software) Flow Control
When software flow control is enabled (See Table 18), the 864 compares one or two sequential receive data
characters with the programmed Xon or Xoff-1,2 character value(s). If receive character(s) match the
programmed values, the 864 will halt transmission as soon as the current character has completed
transmission. When a match occurs, the Xoff (if enabled via IER bit-5) flag will be set and the interrupt output
pin will be activated. Following a suspension due to a match of the Xoff character, the 864 will monitor the
receive data stream for a match to the Xon-1,2 character. If a match is found, the 864 will resume operation
and clear the flags (ISR bit-4).
Reset initially sets the contents of the Xon/Xoff 8-bit flow control registers to a logic 0. Following reset the user
can write any Xon/Xoff value desired for software flow control. Different conditions can be set to detect Xon/
Xoff characters (See Table 18) and suspend/resume transmissions. When double 8-bit Xon/Xoff characters
are selected, the 864 compares two consecutive receive characters with two software flow control 8-bit values
(Xon1, Xon2, Xoff1, Xoff2) and controls TX transmissions accordingly. Under the above described flow control
mechanisms, flow control characters are not placed (stacked) in the user accessible RX data buffer or FIFO.
In the event that the receive buffer is overfilling and flow control needs to be executed, the 864 automatically
sends an Xoff message (when enabled) via the serial TX output to the remote modem. The 864 sends the Xoff1,2 characters two-character-times (= time taken to send two characters at the programmed baud rate) after
the receive FIFO crosses the programmed trigger level (for all trigger tables A-D). To clear this condition, the
864 will transmit the programmed Xon-1,2 characters as soon as receive FIFO is less than one trigger level
below the programmed trigger level (for Trigger Tables A, B, and C) or when receive FIFO is less than the
trigger level minus the hysteresis value (for Trigger Table D). This hysteresis value is the same as the Auto
RTS Hysteresis value in Table 15. Table 7 below explains this when Trigger Table-B (See Table 11) is
selected.
TABLE 7: AUTO XON/XOFF (SOFTWARE) FLOW CONTROL
RX TRIGGER LEVEL
INT PIN ACTIVATION
XOFF CHARACTER(S) SENT
(CHARACTERS IN RX FIFO)
XON CHARACTER(S) SENT
(CHARACTERS IN RX FIFO)
8
8
8*
0
16
16
16*
8
24
24
24*
16
28
28
28*
24
* After the trigger level is reached, an xoff character is sent after a short span of time (= time required to send 2
characters); for example, after 2.083ms has elapsed for 9600 baud and 10-bit word length setting.
2.18
Special Character Detect
A special character detect feature is provided to detect an 8-bit character when bit-5 is set in the Enhanced
Feature Register (EFR). When this character (Xoff2) is detected, it will be placed in the FIFO along with normal
incoming RX data.
The 864 compares each incoming receive character with Xoff-2 data. If a match exists, the received data will
be transferred to FIFO and ISR bit-4 will be set to indicate detection of special character. Although the Internal
Register Table shows Xon, Xoff Registers with eight bits of character information, the actual number of bits is
dependent on the programmed word length. Line Control Register (LCR) bits 0-1 defines the number of
character bits, i.e., either 5 bits, 6 bits, 7 bits, or 8 bits. The word length selected by LCR bits 0-1 also
determines the number of bits that will be used for the special character comparison. Bit-0 in the Xon, Xoff
Registers corresponds with the LSB bit for the receive character.
19
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.19
REV. 2.2.0
Auto RS485 Half-duplex Control
The auto RS485 half-duplex direction control changes the behavior of the transmitter when enabled by FCTR
bit-3. By default, it de-asserts OP1#/RS485 (logic 1) output following the last stop bit of the last character that
has been transmitted. This helps in turning around the transceiver to receive the remote station’s response.
When the host is ready to transmit next polling data packet again, it only has to load data bytes to the transmit
FIFO. The transmitter automatically re-asserts OP1#/RS485 (logic 0) output prior to sending the data.
2.20
Infrared Mode
The 864 UART includes the infrared encoder and decoder compatible to the IrDA (Infrared Data Association)
version 1.0. The IrDA 1.0 standard that stipulates the infrared encoder sends out a 3/16 of a bit wide HIGHpulse for each “0” bit in the transmit data stream. This signal encoding reduces the on-time of the infrared LED,
hence reduces the power consumption. See Figure 11 below.
The infrared encoder and decoder are enabled by setting MCR register bit-6 to a ‘1’. When the infrared feature
is enabled, the transmit data output, TX, idles at logic zero level. Likewise, the RX input assumes an idle level
of logic zero from a reset and power up, see Figure 11.
Typically, the wireless infrared decoder receives the input pulse from the infrared sensing diode on the RX pin.
Each time it senses a light pulse, it returns a logic 1 to the data bit stream. However, this is not true with some
infrared modules on the market which indicate a logic 0 by a light pulse. So the 864 has a provision to invert
the input polarity to accomodate this. In this case, user can enable FCTR bit-2 to invert the input signal.
FIGURE 11. INFRARED TRANSMIT DATA ENCODING AND RECEIVE DATA DECODING
T X D ata
0
Stop
Start
C h aracter
D a ta B its
1
1
0
0
1
0
1
1
0
T ransm it
IR P ulse
(T X P in)
1/2 B it T im e
B it T im e
3/16 B it T im e
IrE ncoder-1
Receive
IR Pulse
(RX pin)
Bit Time
1/16 Clock Delay
1
0
1
0
0
Data Bits
1
1
0
1
Stop
0
Start
RX Data
Character
IRdecoder-1
20
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
2.21
Sleep Mode with Auto Wake-Up
The 864 supports low voltage system designs, hence, a sleep mode is included to reduce its power
consumption when the chip is not actively used.
All of these conditions must be satisfied for the 864 to enter sleep mode:
■
no interrupts pending for all four channels of the 864 (ISR bit-0 = 1)
■
sleep mode of all four channels are enabled (IER bit-4 = 1)
■
modem inputs are not toggling (MSR bits 0-3 = 0)
■
RX input pins are idling at a logic 1
The 864 stops its crystal oscillator to conserve power in the sleep mode. User can check the XTAL2 pin for no
clock output as an indication that the device has entered the sleep mode.
The 864 resumes normal operation by any of the following:
■
a receive data start bit transition (logic 1 to 0)
■
a data byte is loaded to the transmitter, THR or FIFO
■
a change of logic state on any of the modem or general purpose serial inputs: CTS#, DSR#, CD#, RI#
If the 864 is awakened by any one of the above conditions, it will return to the sleep mode automatically after
all interrupting conditions have been serviced and cleared. If the 864 is awakened by the modem inputs, a read
to the MSR is required to reset the modem inputs. In any case, the sleep mode will not be entered while an
interrupt is pending in any channel. The 864 will stay in the sleep mode of operation until it is disabled by
setting IER bit-4 to a logic 0.
If the address lines, data bus lines, IOW#, IOR#, CSA#, CSB#, CSC#, CSD# and modem input lines remain
steady when the 864 is in sleep mode, the maximum current will be in the microamp range as specified in the
DC Electrical Characteristics on page 42. If the input lines are floating or are toggling while the 864 is in sleep
mode, the current can be up to 100 times more. If any of those signals are toggling or floating, then an external
buffer would be required to keep the address, data and control lines steady to achieve the low current.
A word of caution: owing to the starting up delay of the crystal oscillator after waking up from sleep mode, the
first few receive characters may be lost. Also, make sure the RX input is idling at logic 1 or “marking” condition
during sleep mode. This may not occur when the external interface transceivers (RS-232, RS-485 or another
type) are also put to sleep mode and cannot maintain the “marking” condition. To avoid this, the system design
engineer can use a 47k ohm pull-up resistor on the RX A-D inputs.
21
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
2.22
REV. 2.2.0
Internal Loopback
The 864 UART provides an internal loopback capability for system diagnostic purposes. The internal loopback
mode is enabled by setting MCR register bit-4 to logic 1. All regular UART functions operate normally.
Figure 12 shows how the modem port signals are re-configured. Transmit data from the transmit shift register
output is internally routed to the receive shift register input allowing the system to receive the same data that it
was sending. The TX pin is held at logic 1 or mark condition while RTS# and DTR# are de-asserted, and
CTS#, DSR# CD# and RI# inputs are ignored. Caution: the RX input must be held to a logic 1 during loopback
test else upon exiting the loopback test the UART may detect and report a false “break” signal.
FIGURE 12. INTERNAL LOOP BACK IN CHANNELS A-D
VCC
TX A-D
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
RX A-D
VCC
RTS# A-D
Modem / General Purpose Control Logic
Internal Data Bus Lines and Control Signals
MCR bit-4=1
RTS#
CTS#
CTS# A-D
VCC
DTR# A-D
DTR#
DSR#
DSR# A-D
VCC
OP1# A-D/RS485
OP1#
RI#
RI# A-D
VCC
OP2# A-D
OP2#
CD#
CD# A-D
22
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
3.0 UART INTERNAL REGISTERS
Each UART channel in the 864 has its own set of configuration registers selected by address lines A0, A1 and
A2 with a specific channel selected (See Table 1 and Table 2). The complete register set is shown on Table 8
and Table 9.
TABLE 8: UART INTERNAL REGISTERS
A2,A1,A0 ADDRESSES
REGISTER
READ/WRITE
COMMENTS
16C550 COMPATIBLE REGISTERS
0
0 0
RHR - Receive Holding Register
THR - Transmit Holding Register
Read-only
Write-only
LCR[7] = 0
0
0 0
DLL - Div Latch Low Byte
Read/Write
LCR[7] = 1, LCR ≠ 0xBF
0
0 1
DLM - Div Latch High Byte
Read/Write
LCR[7] = 1, LCR ≠ 0xBF
0
0 0
DREV - Device Revision Code
Read-only
DLL, DLM = 0x00,
LCR[7] = 1, LCR ≠ 0xBF
0
0 1
DVID - Device Identification Code
Read-only
DLL, DLM = 0x00,
LCR[7] = 1, LCR ≠ 0xBF
0
0 1
IER - Interrupt Enable Register
Read/Write
LCR[7] = 0
0
1 0
ISR - Interrupt Status Register
FCR - FIFO Control Register
Read-only
Write-only
LCR[7] = 0
0
1 1
LCR - Line Control Register
Read/Write
1
0 0
MCR - Modem Control Register
Read/Write
LCR[7] = 0
1
0 1
LSR - Line Status Register
Reserved
Read-only
Write-only
LCR[7] = 0
1
1 0
MSR - Modem Status Register
Reserved
Read-only
Write-only
LCR[7] = 0
1
1 1
SPR - Scratch Pad Register
Read/Write
LCR[7] = 0, FCTR[6] = 0
1
1 1
FLVL - TX/RX FIFO Level Counter Register
Read-only
LCR[7] = 0, FCTR[6] = 1
1
1 1
EMSR - Enhanced Mode Select Register
Write-only
LCR[7] = 0, FCTR[6] = 1
ENHANCED REGISTERS
0
0 0
TRG - TX/RX FIFO Trigger Level Reg
FC - TX/RX FIFO Level Counter Register
Write-only
Read-only
LCR = 0xBF
0
0 1
FCTR - Feature Control Reg
Read/Write
LCR = 0xBF
0
1 0
EFR - Enhanced Function Reg
Read/Write
LCR = 0xBF
1
0 0
Xon-1 - Xon Character 1
Read/Write
LCR = 0xBF
1
0 1
Xon-2 - Xon Character 2
Read/Write
LCR = 0xBF
1
1 0
Xoff-1 - Xoff Character 1
Read/Write
LCR = 0xBF
1
1 1
Xoff-2 - Xoff Character 2
Read/Write
LCR = 0xBF
X
X X
FSTAT - FIFO Status Register
Read-only
FSRS# pin is logic 0
23
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
.
TABLE 9: INTERNAL REGISTERS DESCRIPTION. SHADED BITS ARE ENABLED WHEN EFR BIT-4=1
ADDRESS
A2-A0
REG
NAME
READ/
WRITE
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
COMMENT
16C550 Compatible Registers
000
RHR
RD
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
000
THR
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
001
IER
RD/WR
0/
0/
0/
0/
CTS#
Int.
Enable
RTS#
Int.
Enable
Xoff Int.
Enable
Sleep
Mode
Enable
0/
0/
INT
Source
Bit-5
INT
Source
Bit-4
0/
0/
010
010
ISR
FCR
RD
WR
FIFOs
FIFOs
Enabled Enabled
RX FIFO RX FIFO
Trigger Trigger
TX FIFO TX FIFO
Trigger Trigger
011
LCR
RD/WR
Divisor
Enable
Set TX
Break
Set Parity
100
MCR
RD/WR
0/
0/
0/
BRG
Prescaler
Even
Parity
Modem RX Line
TX
RX
Stat. Int.
Stat.
Empty
Data
Enable
Int.
Int
Int.
Enable Enable Enable
INT
Source
Bit-3
INT
INT
INT
Source Source Source
Bit-2
Bit-1
Bit-0
DMA
Mode
Enable
TX
FIFO
Reset
Parity
Enable
Stop
Bits
RX
FIFO
Reset
FIFOs
Enable
Word
Word
Length Length
Bit-1
Bit-0
Internal
OP2#/
OP1#/ RTS# DTR#
Lopback INT Out- RS-485 Output Output
IR Mode XonAny Enable
put
Output Control Control
ENable
Enable Control
101
LSR
RD
RX FIFO
Global
Error
THR &
TSR
Empty
THR
Empty
RX
Break
RX Framing Error
RX
Parity
Error
RX
Overrun
Error
RX
Data
Ready
110
MSR
RD
CD#
Input
RI#
Input
DSR#
Input
CTS#
Input
Delta
CD#
Delta
RI#
Delta
DSR#
Delta
CTS#
111
SPR
RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
111
EMSR
WR
Rsvd
Rsvd
Auto
RTS
Hyst.
bit-3
Auto
RTS
Hyst.
bit-2
Enable
RX DMA
Enable
TX
DMA
Rx/Tx
FIFO
Count
Rx/Tx
FIFO
Count
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
111
FLVL
RD
Bit-7
LCR[7] = 0
Bit-6
24
LCR[7] = 0
LCR[7] = 0
FCTR[6]=0
LCR[7] = 0
FCTR[6]=1
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
TABLE 9: INTERNAL REGISTERS DESCRIPTION. SHADED BITS ARE ENABLED WHEN EFR BIT-4=1
ADDRESS
A2-A0
REG
NAME
READ/
WRITE
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
COMMENT
LCR[7] = 1
LCR ≠ 0xBF
Baud Rate Generator Divisor
000
DLL
RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
001
DLM
RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
000
DREV
RD
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
001
DVID
RD
0
0
0
1
0
1
0
0
LCR[7] = 1
LCR ≠ 0xBF
DLL=0x00
DLM=0x00
Enhanced Registers
000
TRG
WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
000
FC
RD
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
RX/TX
Mode
SCPAD
Swap
Trig
Table
Bit-1
Trig
Table
Bit-0
Auto
RS485
Direction
Control
RX IR
Input
Inv.
Auto
RTS
Hyst
Bit-1
Auto
RTS
Hyst
Bit-0
Auto
CTS#
Enable
Auto
RTS#
Enable
Special
Char
Select
Enable
Software
Flow
Cntl
Bit-3
Software
Flow
Cntl
Bit-2
Software
Flow
Cntl
Bit-1
Software
Flow
Cntl
Bit-0
001
010
FCTR RD/WR
EFR
RD/WR
IER [7:4],
ISR [5:4],
FCR[5:4],
MCR[7:5]
100
XON1 RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
101
XON2 RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
110
XOFF1 RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
111
XOFF2 RD/WR
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1
Bit-0
XXX
FSTAT
RXRDYD#
RXRDYC#
RXRDYB#
RXRDYA#
TXRDYD#
RD
25
LCR=0XBF
FSRS# pin is
TXTXTXRDYC# RDYB# RDYA# a logic 0. No
address lines
required.
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
4.0 INTERNAL REGISTER DESCRIPTIONS
4.1
Receive Holding Register (RHR) - Read- Only
SEE”RECEIVER” ON PAGE 15.
4.2
Transmit Holding Register (THR) - Write-Only
SEE”TRANSMITTER” ON PAGE 14.
4.3
Interrupt Enable Register (IER) - Read/Write
The Interrupt Enable Register (IER) masks the interrupts from receive data ready, transmit empty, line status
and modem status registers. These interrupts are reported in the Interrupt Status Register (ISR).
4.3.1
IER versus Receive FIFO Interrupt Mode Operation
When the receive FIFO (FCR BIT-0 = 1) and receive interrupts (IER BIT-0 = 1) are enabled, the RHR interrupts
(see ISR bits 2 and 3) status will reflect the following:
A. The receive data available interrupts are issued to the host when the FIFO has reached the programmed
trigger level. It will be cleared when the FIFO drops below the programmed trigger level.
B. FIFO level will be reflected in the ISR register when the FIFO trigger level is reached. Both the ISR register
status bit and the interrupt will be cleared when the FIFO drops below the trigger level.
C. The receive data ready bit (LSR BIT-0) is set as soon as a character is transferred from the shift register to
the receive FIFO. It is reset when the FIFO is empty.
4.3.2
IER versus Receive/Transmit FIFO Polled Mode Operation
When FCR BIT-0 equals a logic 1 for FIFO enable; resetting IER bits 0-3 enables the XR16C864 in the FIFO
polled mode of operation. Since the receiver and transmitter have separate bits in the LSR either or both can
be used in the polled mode by selecting respective transmit or receive control bit(s).
A. LSR BIT-0 indicates there is data in RHR or RX FIFO.
B. LSR BIT-1 indicates an overrun error has occurred and that data in the FIFO may not be valid.
C. LSR BIT 2-4 provides the type of receive data errors encountered for the data byte in RHR, if any.
D. LSR BIT-5 indicates THR is empty.
E. LSR BIT-6 indicates when both the transmit FIFO and TSR are empty.
F. LSR BIT-7 indicates a data error in at least one character in the RX FIFO.
IER[0]: RHR Interrupt Enable
The receive data ready interrupt will be issued when RHR has a data character in the non-FIFO mode or when
the receive FIFO has reached the programmed trigger level in the FIFO mode.
Logic 0 = Disable the receive data ready interrupt (default).
Logic 1 = Enable the receiver data ready interrupt.
IER[1]: THR Interrupt Enable
This bit enables the Transmit Ready interrupt which is issued whenever the THR becomes empty in the nonFIFO mode or when data in the FIFO falls below the programmed trigger level in the FIFO mode. If the THR is
empty when this bit is enabled, an interrupt will be generated.
Logic 0 = Disable Transmit Ready interrupt (default).
Logic 1 = Enable Transmit Ready interrupt.
26
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
IER[2]: Receive Line Status Interrupt Enable
If any of the LSR register bits 1, 2, 3 or 4 is a logic 1, it will generate an interrupt to inform the host controller
about the error status of the current data byte in FIFO. These LSR bits generate an interrupt immediately when
the character has been received.
• Logic 0 = Disable the receiver line status interrupt (default).
• Logic 1 = Enable the receiver line status interrupt.
IER[3]: Modem Status Interrupt Enable
• Logic 0 = Disable the modem status register interrupt (default).
• Logic 1 = Enable the modem status register interrupt.
IER[4]: Sleep Mode Enable (requires EFR[4] = 1)
• Logic 0 = Disable Sleep Mode (default).
• Logic 1 = Enable Sleep Mode. SEE”SLEEP MODE WITH AUTO WAKE-UP” ON PAGE 21.
IER[5]: Xoff Interrupt Enable (requires EFR[4]=1)
• Logic 0 = Disable the software flow control, receive Xoff interrupt (default).
• Logic 1 = Enable the software flow control, receive Xoff interrupt. See Software Flow Control section for
details.
IER[6]: RTS# Output Interrupt Enable (requires EFR[4]=1)
• Logic 0 = Disable the RTS# interrupt (default).
• Logic 1 = Enable the RTS# interrupt. The UART issues an interrupt when the RTS# pin makes a transition
from low to high.
IER[7]: CTS# Input Interrupt Enable (requires EFR[4]=1)
• Logic 0 = Disable the CTS# interrupt (default).
• Logic 1 = Enable the CTS# interrupt. The UART issues an interrupt when CTS# pin makes a transition from
low to high.
4.4
Interrupt Status Register (ISR) - Read-Only
The UART provides multiple levels of prioritized interrupts to minimize external software interaction. The
Interrupt Status Register (ISR) provides the user with six interrupt status bits. Performing a read cycle on the
ISR will give the user the current highest pending interrupt level to be serviced, others are queued up to be
serviced next. No other interrupts are acknowledged until the pending interrupt is serviced. The Interrupt
Source Table, Table 10, shows the data values (bit 0-5) for the interrupt priority levels and the interrupt sources
associated with each of these interrupt levels.
4.4.1
Interrupt Generation:
• LSR is by any of the LSR bits 1, 2, 3 and 4.
• RXRDY is by RX trigger level.
• RXRDY Time-out is by a 4-char plus 12 bits delay timer.
• TXRDY is by TX trigger level or TX FIFO empty (or transmitter empty in auto RS-485 control).
• MSR is by any of the MSR bits 0, 1, 2 and 3.
• Receive Xoff/Special character is by detection of a Xoff or Special character.
• CTS# is when its transmitter toggles the input pin (from low to high) during auto CTS flow control.
• RTS# is when its receiver toggles the output pin (from low to high) during auto RTS flow control.
27
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
4.4.2
REV. 2.2.0
Interrupt Clearing:
• LSR interrupt is cleared by a read to the LSR register.
• RXRDY interrupt is cleared by reading data until FIFO falls below the trigger level.
• RXRDY Time-out interrupt is cleared by reading RHR.
• TXRDY interrupt is cleared by a read to the ISR register or writing to THR.
• MSR interrupt is cleared by a read to the MSR register.
• Xoff interrupt is cleared by a read to ISR or when Xon character(s) is received.
• Special character interrupt is cleared by a read to ISR or after the next character is received.
• RTS# and CTS# flow control interrupts are cleared by a read to the MSR register.
]
TABLE 10: INTERRUPT SOURCE AND PRIORITY LEVEL
PRIORITY
ISR REGISTER STATUS BITS
SOURCE OF INTERRUPT
LEVEL
BIT-5
BIT-4
BIT-3
BIT-2
BIT-1
BIT-0
1
0
0
0
1
1
0
LSR (Receiver Line Status Register)
2
0
0
1
1
0
0
RXRDY (Receive Data Time-out)
3
0
0
0
1
0
0
RXRDY (Received Data Ready)
4
0
0
0
0
1
0
TXRDY (Transmit Ready)
5
0
0
0
0
0
0
MSR (Modem Status Register)
6
0
1
0
0
0
0
RXRDY (Received Xoff or Special character)
7
1
0
0
0
0
0
CTS#, RTS# change of state
-
0
0
0
0
0
1
None (default)
ISR[0]: Interrupt Status
• Logic 0 = An interrupt is pending and the ISR contents may be used as a pointer to the appropriate interrupt
service routine.
• Logic 1 = No interrupt pending (default condition).
ISR[3:1]: Interrupt Status
These bits indicate the source for a pending interrupt at interrupt priority levels (See Interrupt Source
Table 10).
ISR[5:4]: Interrupt Status
These bits are enabled when EFR bit-4 is set to a logic 1. ISR bit-4 indicates that the receiver detected a data
match of the Xoff character(s). Note that once set to a logic 1, the ISR bit-4 will stay a logic 1 until a Xon
character is received. ISR bit-5 indicates that CTS# or RTS# has changed state.
ISR[7:6]: FIFO Enable Status
These bits are set to a logic 0 when the FIFOs are disabled. They are set to a logic 1 when the FIFOs are
enabled.
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REV. 2.2.0
4.5
FIFO Control Register (FCR) - Write-Only
This register is used to enable the FIFOs, clear the FIFOs, set the transmit/receive FIFO trigger levels, and
select the DMA mode. The DMA and FIFO modes are defined as follows:
FCR[0]: TX and RX FIFO Enable
• Logic 0 = Disable the transmit and receive FIFO (default).
• Logic 1 = Enable the transmit and receive FIFOs. This bit must be set to logic 1 when other FCR bits are
written or they will not be programmed.
FCR[1]: RX FIFO Reset
This bit is only active when FCR bit-0 is a ‘1’.
• Logic 0 = No receive FIFO reset (default)
• Logic 1 = Reset the receive FIFO pointers and FIFO level counter logic (the receive shift register is not
cleared or altered). This bit will return to a logic 0 after resetting the FIFO.
FCR[2]: TX FIFO Reset
This bit is only active when FCR bit-0 is a ‘1’.
• Logic 0 = No transmit FIFO reset (default).
• Logic 1 = Reset the transmit FIFO pointers and FIFO level counter logic (the transmit shift register is not
cleared or altered). This bit will return to a logic 0 after resetting the FIFO.
FCR[3]: DMA Mode Select
Controls the behavior of the TXRDY# and RXRDY# pins. See DMA operation section for details.
• Logic 0 = Normal Operation (default).
• Logic 1 = DMA Mode.
FCR[5:4]: Transmit FIFO Trigger Select
(logic 0 = default, TX trigger level = one)
These 2 bits set the trigger level for the transmit FIFO. The UART will issue a transmit interrupt when the
number of characters in the FIFO falls below the selected trigger level, or when it gets empty in case that the
FIFO did not get filled over the trigger level on last re-load. Table 11 below shows the selections. EFR bit-4
must be set to ‘1’ before these bits can be accessed. Note that the receiver and the transmitter cannot use
different trigger tables. Whichever selection is made last applies to both the RX and TX side.
FCR[7:6]: Receive FIFO Trigger Select
(logic 0 = default, RX trigger level =1)
The FCTR Bits 5-4 are associated with these 2 bits. These 2 bits are used to set the trigger level for the receive
FIFO. The UART will issue a receive interrupt when the number of the characters in the FIFO crosses the
trigger level. Table 11 shows the complete selections. Note that the receiver and the transmitter cannot use
different trigger tables. Whichever selection is made last applies to both the RX and TX side.
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REV. 2.2.0
TABLE 11: TRANSMIT AND RECEIVE FIFO TRIGGER LEVEL SELECTION
FCTR
BIT-5
FCTR
BIT-4
0
0
0
FCR
BIT-7
FCR
BIT-6
0
0
1
1
0
1
0
1
1
4.6
FCR
BIT-4
0
0
0
0
1
1
0
1
0
1
0
1
0
1
X
X
COMPATIBILITY
Table-A. 16C550, 16C2550,
16C2552, 16C554, 16C580
compatible.
16
8
24
30
Table-B. 16C650A compatible.
8
16
32
56
Table-C. 16C654 compatible.
8
16
24
28
0
0
1
1
0
0
1
1
TRANSMIT
TRIGGER
LEVEL
1 (default)
0
1
0
1
0
1
RECEIVE
TRIGGER LEVEL
1 (default)
4
8
14
1
0
0
1
1
1
FCR
BIT-5
0
1
0
1
8
16
56
60
X
Programmable Programmable Table-D. 16L2750, 16C2850,
16C2852, 16C850, 16C864
via TRG
via TRG
compatible.
register.
register.
FCTR[7] = 1.
FCTR[7] = 0.
X
Line Control Register (LCR) - Read/Write
The Line Control Register is used to specify the asynchronous data communication format. The word or
character length, the number of stop bits, and the parity are selected by writing the appropriate bits in this
register.
LCR[1:0]: TX and RX Word Length Select
These two bits specify the word length to be transmitted or received.
BIT-1
BIT-0
WORD LENGTH
0
0
5 (default)
0
1
6
1
0
7
1
1
8
30
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
LCR[2]: TX and RX Stop-bit Length Select
The length of stop bit is specified by this bit in conjunction with the programmed word length.
LENGTH
STOP BIT LENGTH
(BIT TIME(S))
0
5,6,7,8
1 (default)
1
5
1-1/2
1
6,7,8
2
WORD
BIT-2
LCR[3]: TX and RX Parity Select
Parity or no parity can be selected via this bit. The parity bit is a simple way used in communications for data
integrity check. See Table 12 for parity selection summary below.
• Logic 0 = No parity.
• Logic 1 = A parity bit is generated during the transmission while the receiver checks for parity error of the
data character received.
LCR[4]: TX and RX Parity Select
If the parity bit is enabled with LCR bit-3 set to a logic 1, LCR BIT-4 selects the even or odd parity format.
• Logic 0 = ODD Parity is generated by forcing an odd number of logic 1’s in the transmitted character. The
receiver must be programmed to check the same format (default).
• Logic 1 = EVEN Parity is generated by forcing an even number of logic 1’s in the transmitted character. The
receiver must be programmed to check the same format.
LCR[5]: TX and RX Parity Select
If the parity bit is enabled, LCR BIT-5 selects the forced parity format.
• LCR BIT-5 = logic 0, parity is not forced (default).
• LCR BIT-5 = logic 1 and LCR BIT-4 = logic 0, parity bit is forced to a logical 1 for the transmit and receive
data.
• LCR BIT-5 = logic 1 and LCR BIT-4 = logic 1, parity bit is forced to a logical 0 for the transmit and receive
data.
TABLE 12: PARITY SELECTION
LCR BIT-5
LCR BIT-4
LCR BIT-3
PARITY SELECTION
X
X
0
No parity
0
0
1
Odd parity
0
1
1
Even parity
1
0
1
Force parity to mark, “1”
1
1
1
Forced parity to space, “0”
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REV. 2.2.0
LCR[6]: Transmit Break Enable
When enabled, the Break control bit causes a break condition to be transmitted (the TX output is forced to a
“space’, logic 0, state). This condition remains, until disabled by setting LCR bit-6 to a logic 0.
• Logic 0 = No TX break condition (default).
• Logic 1 = Forces the transmitter output (TX) to a “space”, logic 0, for alerting the remote receiver of a line
break condition.
LCR[7]: Baud Rate Divisors Enable
• Logic 0 = Data registers are selected (default).
• Logic 1 = Divisor latch registers are selected.
4.7
Modem Control Register (MCR) or General Purpose Outputs Control - Read/Write
The MCR register is used for controlling the serial/modem interface signals or general purpose inputs/outputs.
MCR[0]: DTR# Output
The DTR# pin is a modem control output. If the modem interface is not used, this output may be used as a
general purpose output.
• Logic 0 = Force DTR# output to a logic 1 (default).
• Logic 1 = Force DTR# output to a logic 0.
MCR[1]: RTS# Output
The RTS# pin is a modem control output and may be used for automatic hardware flow control by enabled by
EFR bit-6. If the modem interface is not used, this output may be used as a general purpose output.
• Logic 0 = Force RTS# output to a logic 1 (default).
• Logic 1 = Force RTS# output to a logic 0.
MCR[2]: OP1# Output or RS485 Output Control
In the Loopback Mode, this bit is used to write the state of the modem RI# interface signal. If Auto RS-485
Half-Duplex direction control is enabled via FCTR bit-3, MCR bit-2 should not be written to.
MCR[3]: INT Output Enable
Enable or disable INT outputs to become active or in three-state. This function is associated with the INTSEL
input, see below table for details. This bit is also used to control the OP2# signal during internal loopback
mode. INTSEL pin must be set to a logic zero during 68 mode.
• Logic 0 = INT (A-D) outputs disabled (three state) in the 16 mode (default). During loopback mode, it sets
OP2# internally to a logic 1.
• Logic 1 = INT (A-D) outputs enabled (active) in the 16 mode. During loopback mode, it sets OP2# internally
to a logic 0.
TABLE 13: INT OUTPUT MODES
INTSEL
PIN
MCR
BIT-3
INT A-D OUTPUTS IN 16 MODE
0
0
Three-State
0
1
Active
1
X
Active
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XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
MCR[4]: Internal Loopback Enable
• Logic 0 = Disable loopback mode (default).
• Logic 1 = Enable local loopback mode, see loopback section and Figure 12.
MCR[5]: Xon-Any Enable
• Logic 0 = Disable Xon-Any function (for 16C550 compatibility, default).
• Logic 1 = Enable Xon-Any function. In this mode, any RX character received will resume transmit operation.
The RX character will be loaded into the RX FIFO , unless the RX character is an Xon or Xoff character and
the 864 is programmed to use the Xon/Xoff flow control.
MCR[6]: Infrared Encoder/Decoder Enable
• Logic 0 = Enable the standard modem receive and transmit input/output interface (default).
• Logic 1 = Enable infrared IrDA receive and transmit inputs/outputs. The TX/RX output/input are routed to the
infrared encoder/decoder. The data input and output levels conform to the IrDA infrared interface
requirement. The RX FIFO may need to be flushed upon enable. While in this mode, the infrared TX output
will be a logic 0 during idle data conditions.
MCR[7]: Clock Prescaler Select
The CLKSEL pin selects this function upon power up or reset. After the power up or reset, this register bit will
have control and can alter the logic state.
• Logic 0 = Divide by one. The input clock from the crystal or external clock is fed directly to the Programmable
Baud Rate Generator without further modification, i.e., divide by one (default).
• Logic 1 = Divide by four. The prescaler divides the input clock from the crystal or external clock by four and
feeds it to the Programmable Baud Rate Generator, hence, data rates become one forth.
4.8
Line Status Register (LSR) - Read Only
This register provides the status of data transfers between the UART and the host. If LSR bits 1-4 are
asserted, an interrupt will be generated immediately if IER bit-2 is enabled.
LSR[0]: Receive Data Ready Indicator
• Logic 0 = No data in receive holding register or FIFO (default).
• Logic 1 = Data has been received and is saved in the receive holding register or FIFO.
LSR[1]: Receiver Overrun Flag
• Logic 0 = No overrun error (default).
• Logic 1 = Overrun error. A data overrun error condition occurred in the receive shift register. This happens
when additional data arrives while the FIFO is full. In this case the previous data in the receive shift register
is overwritten. Note that under this condition the data byte in the receive shift register is not transferred into
the FIFO, therefore the data in the FIFO is not corrupted by the error.
LSR[2]: Receive Data Parity Error Tag
• Logic 0 = No parity error (default).
• Logic 1 = Parity error. The receive character in RHR does not have correct parity information and is suspect.
This error is associated with the character available for reading in RHR.
LSR[3]: Receive Data Framing Error Tag
• Logic 0 = No framing error (default).
• Logic 1 = Framing error. The receive character did not have a valid stop bit(s). This error is associated with
the character available for reading in RHR.
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2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
LSR[4]: Receive Break Tag
• Logic 0 = No break condition (default).
• Logic 1 = The receiver received a break signal (RX was a logic 0 for at least one character frame time). In the
FIFO mode, only one break character is loaded into the FIFO. The break indication remains until the RX
input returns to the idle condition, “mark” or logic 1.
LSR[5]: Transmit Holding Register Empty Flag
This bit is the Transmit Holding Register Empty indicator. The THR bit is set to a logic 1 when the last data byte
is transferred from the transmit holding register to the transmit shift register. The bit is reset to logic 0
concurrently with the data loading to the transmit holding register by the host. In the FIFO mode this bit is set
when the transmit FIFO is empty, it is cleared when the transmit FIFO contains at least 1 byte.
LSR[6]: THR and TSR Empty Flag
This bit is set to a logic 1 whenever the transmitter goes idle. It is set to logic 0 whenever either the THR or
TSR contains a data character. In the FIFO mode this bit is set to a logic 1 whenever the transmit FIFO and
transmit shift register are both empty.
LSR[7]: Receive FIFO Data Error Flag
• Logic 0 = No FIFO error (default).
• Logic 1 = A global indicator for the sum of all error bits in the RX FIFO. At least one parity error, framing error
or break indication is in the FIFO data. This bit clears when there is no more error(s) in any of the bytes in the
RX FIFO.
4.9
Modem Status Register (MSR) - Read Only
This register provides the current state of the modem interface input signals. Lower four bits of this register are
used to indicate the changed information. These bits are set to a logic 1 whenever a signal from the modem
changes state. These bits may be used for general purpose inputs when they are not used with modem
signals.
MSR[0]: Delta CTS# Input Flag
• Logic 0 = No change on CTS# input (default).
• Logic 1 = The CTS# input has changed state since the last time it was monitored. A modem status interrupt
will be generated if MSR interrupt is enabled (IER bit-3).
MSR[1]: Delta DSR# Input Flag
• Logic 0 = No change on DSR# input (default).
• Logic 1 = The DSR# input has changed state since the last time it was monitored. A modem status interrupt
will be generated if MSR interrupt is enabled (IER bit-3).
MSR[2]: Delta RI# Input Flag
• Logic 0 = No change on RI# input (default).
• Logic 1 = The RI# input has changed from a logic 0 to a logic 1, ending of the ringing signal. A modem status
interrupt will be generated if MSR interrupt is enabled (IER bit-3).
MSR[3]: Delta CD# Input Flag
• Logic 0 = No change on CD# input (default).
• Logic 1 = Indicates that the CD# input has changed state since the last time it was monitored. A modem
status interrupt will be generated if MSR interrupt is enabled (IER bit-3).
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XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
MSR[4]: CTS Input Status
CTS# pin may function as automatic hardware flow control signal input if it is enabled and selected by Auto
CTS (EFR bit-7). Auto CTS flow control allows starting and stopping of local data transmissions based on the
modem CTS# signal. A logic 1 on the CTS# pin will stop UART transmitter as soon as the current character
has finished transmission, and a logic 0 will resume data transmission. Normally MSR bit-4 bit is the
compliment of the CTS# input. However in the loopback mode, this bit is equivalent to the RTS# bit in the MCR
register. The CTS# input may be used as a general purpose input when the modem interface is not used.
MSR[5]: DSR Input Status
DSR# (active high, logical 1). Normally this bit is the compliment of the DSR# input. In the loopback mode, this
bit is equivalent to the DTR# bit in the MCR register. The DSR# input may be used as a general purpose input
when the modem interface is not used.
MSR[6]: RI Input Status
RI# (active high, logical 1). Normally this bit is the compliment of the RI# input. In the loopback mode this bit is
equivalent to bit-2 in the MCR register. The RI# input may be used as a general purpose input when the
modem interface is not used.
MSR[7]: CD Input Status
CD# (active high, logical 1). Normally this bit is the compliment of the CD# input. In the loopback mode this bit
is equivalent to bit-3 in the MCR register. The CD# input may be used as a general purpose input when the
modem interface is not used.
4.10
Scratch Pad Register (SPR) - Read/Write
This is a 8-bit general purpose register for the user to store temporary data. The content of this register is
preserved during sleep mode but becomes 0xFF (default) after a reset or a power off-on cycle.
4.11
Enhanced Mode Select Register (EMSR)
This register replaces SPR (during a Write) and is accessible only when FCTR[6] = 1.
EMSR[1:0]: Receive/Transmit FIFO Count (Write-Only)
When Scratchpad Swap (FCTR[6]) is asserted, EMSR bits 1-0 controls what mode the FIFO Level Counter is
operating in.
TABLE 14: SCRATCHPAD SWAP SELECTION
FCTR[6]
EMSR[1]
EMSR[0]
Scratchpad is
0
X
X
Scratchpad
1
0
0
RX FIFO Counter Mode
1
0
1
TX FIFO Counter Mode
1
1
0
RX FIFO Counter Mode
1
1
1
Alternate RX/TX FIFO Counter Mode
During Alternate RX/TX FIFO Counter Mode, the first value read after EMSR bits 1-0 have been asserted will
always be the RX FIFO Counter. The second value read will correspond with the TX FIFO Counter. The next
value will be the RX FIFO Counter again, then the TX FIFO Counter and so on and so forth.
EMSR[2]: Transmit Direct Memory Access Request Enable
Logic 0 = Normal.
Logic 1 = Enable TX Direct Memory Access Request. See DACK, TC, AEN, TXDRQ and RXDRQ pin
descriptions for details.
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XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
EMSR[3]: Receive Direct Memory Access Request Enable
Logic 0 = Normal.
Logic 1 = Enable RX Direct Memory Access Request. See DACK, TC, AEN, TXDRQ and RXDRQ pin
descriptions for details.
EMSR[5:4]: Extended RTS Hysteresis
TABLE 15: AUTO RTS HYSTERESIS
TABLE 16:
EMSR
BIT-5
EMSR
BIT-4
FCTR
BIT-1
FCTR
BIT-0
RTS#
HYSTERESIS
(CHARACTERS)
0
0
0
0
0
0
0
0
0
0
1
1
0
1
0
1
0
±4
±6
±8
0
0
0
0
1
1
1
1
0
0
1
1
0
1
0
1
±8
±16
±24
±32
1
1
1
1
0
0
0
0
0
0
1
1
0
1
0
1
±40
±44
±48
±52
1
1
1
1
1
1
1
1
0
0
1
1
0
1
0
1
±12
±20
±28
±36
EMSR[7:6]: Reserved
4.12
FIFO Level Register (FLVL) - Read-Only
The FIFO Level Register replaces the Scratchpad Register (during a Read) when FCTR[6] = 1. Note that this
is not identical to the FIFO Data Count Register which can be accessed when LCR = 0xBF.
FLVL[7:0]: FIFO Level Register
This register provides the FIFO counter level for the RX FIFO or the TX FIFO or both depending on EMSR[1:0].
See Table 14 for details.
36
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
4.13
Baud Rate Generator Registers (DLL and DLM) - Read/Write
The concatenation of the contents of DLM and DLL gives the 16-bit divisor value which is used to calculate the
baud rate:
• Baud Rate = (Clock Frequency / 16) / Divisor
See MCR bit-7 and the baud rate table also.
4.14
Device Identification Register (DVID) - Read Only
This register contains the device ID (0x14 for XR16C864). Prior to reading this register, DLL and DLM should
be set to 0x00.
4.15
Device Revision Register (DREV) - Read Only
This register contains the device revision information. For example, 0x01 means revision A. Prior to reading
this register, DLL and DLM should be set to 0x00.
4.16
Trigger Level (TRG) - Write-Only
User Programmable Transmit/Receive Trigger Level Register.
TRG[7:0]: Trigger Level Register
These bits are used to program desired trigger levels when trigger Table-D is selected. FCTR bit-7 selects
between programming the RX Trigger Level (a logic 0) and the TX Trigger Level (a logic 1).
4.17
FIFO Data Count Register (FC) - Read-Only
This register is accessible when LCR = 0xBF. Note that this register is not identical to the FIFO Level Count
Register which is located in the general register set when FCTR bit-6 = 1 (Scratchpad Register Swap). It is
suggested to read the FIFO Level Count Register at the Scratchpad Register location when FCTR bit-6 = 1.
See Table 14.
FC[7:0]: FIFO Data Count Register
Transmit/Receive FIFO Count. Number of characters in Transmit (FCTR[7] = 1) or Receive FIFO (FCTR[7] =
0) can be read via this register.
4.18
Feature Control Register (FCTR) - Read/Write
This register controls the XR16C864 new functions that are not available in ST16C554 or ST16C654.
FCTR[1:0]: RTS Hysteresis
User selectable RTS# hysteresis levels for hardware flow control application. After reset, these bits are set to
“0” to select the next trigger level for hardware flow control. See Table 15 for more details.
FCTR[2]: IrDA RX Inversion
• Logic 0 = Select RX input as encoded IrDA data (Idle state will be logic 0).
• Logic 1 = Select RX input as inverted encoded IrDA data (Idle state will be logic 1).
FCTR[3]: Auto RS-485 Direction Control
• Logic 0 = OP1# can be used as a general purpose output and can be controlled via MCR bit-2.
• Logic 1 = OP1# is used as the Auto RS-485 half-duplex direction control output. The TX Ready Interrupt
behavior also changes. See Table 3.
37
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FCTR[5:4]: Transmit/Receive Trigger Table Select
See Table 11 for more details.
TABLE 17: TRIGGER TABLE SELECT
FCTR
BIT-5
FCTR
BIT-4
0
0
Table-A (TX/RX)
0
1
Table-B (TX/RX)
1
0
Table-C (TX/RX)
1
1
Table-D (TX/RX)
TABLE
FCTR[6]: Scratchpad Swap
• Logic 0 = Scratch Pad register is selected as general read and write register. ST16C550 compatible mode.
• Logic 1 = FIFO Count register (Read-Only), Enhanced Mode Select Register (Write-Only). Number of
characters in transmit or receive holding register can be read via scratch pad register when this bit is set.
Enhanced Mode Select Register is selected when it is written into.
FCTR[7]: Programmable Trigger Register Select
• Logic 0 = Registers TRG and FC selected for RX.
• Logic 1 = Registers TRG and FC selected for TX.
4.19
Enhanced Feature Register (EFR) - Read/Write
Enhanced features are enabled or disabled using this register. Bit 0-3 provide single or dual consecutive
character software flow control selection (see Table 18). When the Xon1 and Xon2 and Xoff1 and Xoff2 modes
are selected, the double 8-bit words are concatenated into two sequential characters. Caution: note that
whenever changing the TX or RX flow control bits, always reset all bits back to logic 0 (disable) before
programming a new setting.
38
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
EFR[3:0]: Software Flow Control Select
Single character and dual sequential characters software flow control is supported. Combinations of software
flow control can be selected by programming these bits.
TABLE 18: SOFTWARE FLOW CONTROL FUNCTIONS
EFR BIT-3
CONT-3
EFR BIT-2
CONT-2
EFR BIT-1
CONT-1
EFR BIT-0
CONT-0
0
0
0
0
No TX and RX flow control (default and reset)
0
0
X
X
No transmit flow control
1
0
X
X
Transmit Xon1, Xoff1
0
1
X
X
Transmit Xon2, Xoff2
1
1
X
X
Transmit Xon1 and Xon2, Xoff1 and Xoff2
X
X
0
0
No receive flow control
X
X
1
0
Receiver compares Xon1, Xoff1
X
X
0
1
Receiver compares Xon2, Xoff2
1
0
1
1
Transmit Xon1, Xoff1
Receiver compares Xon1 or Xon2, Xoff1 or Xoff2
0
1
1
1
Transmit Xon2, Xoff2
Receiver compares Xon1 or Xon2, Xoff1 or Xoff2
1
1
1
1
Transmit Xon1 and Xon2, Xoff1 and Xoff2,
Receiver compares Xon1 and Xon2, Xoff1 and Xoff2
0
0
1
1
No transmit flow control,
Receiver compares Xon1 and Xon2, Xoff1 and Xoff2
TRANSMIT AND RECEIVE SOFTWARE FLOW CONTROL
EFR[4]: Enhanced Function Bits Enable
Enhanced function control bit. This bit enables IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and MCR bits 5-7 to be
modified. After modifying any enhanced bits, EFR bit-4 can be set to a logic 0 to latch the new values. This
feature prevents legacy software from altering or overwriting the enhanced functions once set. Normally, it is
recommended to leave it enabled, logic 1.
• Logic 0 = modification disable/latch enhanced features. IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and MCR
bits 5-7 are saved to retain the user settings. After a reset, the IER bits 4-7, ISR bits 4-5, FCR bits 4-5, and
MCR bits 5-7are set to a logic 0 to be compatible with ST16C550 mode (default).
• Logic 1 = Enables the above-mentioned register bits to be modified by the user.
EFR[5]: Special Character Detect Enable
• Logic 0 = Special Character Detect Disabled (default).
• Logic 1 = Special Character Detect Enabled. The UART compares each incoming receive character with
data in Xoff-2 register. If a match exists, the receive data will be transferred to FIFO and ISR bit-4 will be set
to indicate detection of the special character. Bit-0 corresponds with the LSB bit of the receive character. If
flow control is set for comparing Xon1, Xoff1 (EFR [1:0]= ‘10’) then flow control and special character work
normally. However, if flow control is set for comparing Xon2, Xoff2 (EFR[1:0]= ‘01’) then flow control works
normally, but Xoff2 will not go to the FIFO, and will generate an Xoff interrupt and a special character
interrupt, if enabled via IER bit-5.
39
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
EFR[6]: Auto RTS Flow Control Enable
RTS# output may be used for hardware flow control by setting EFR bit-6 to logic 1. When Auto RTS is
selected, an interrupt will be generated when the receive FIFO is filled to the programmed trigger level and
RTS de-asserts to a logic 1 at the next upper trigger level/hysteresis level. RTS# will return to a logic 0 when
FIFO data falls below the next lower trigger level/hysteresis level. The RTS# output must be asserted (logic 0)
before the auto RTS can take effect. RTS# pin will function as a general purpose output when hardware flow
control is disabled.
• Logic 0 = Automatic RTS flow control is disabled (default).
• Logic 1 = Enable Automatic RTS flow control.
EFR[7]: Auto CTS Flow Control Enable
Automatic CTS Flow Control.
• Logic 0 = Automatic CTS flow control is disabled (default).
• Logic 1 = Enable Automatic CTS flow control. Data transmission stops when CTS# input de-asserts to logic
1. Data transmission resumes when CTS# returns to a logic 0.
4.20
Software Flow Control Registers (XOFF1, XOFF2, XON1, XON2) - Read/Write
These registers are used as the programmable software flow control characters xoff1, xoff2, xon1, and xon2.
For more details, see Table 7.
4.21
FIFO Status Register (FSTAT) - Read/Write
The FIFO Status Register provides a status indication for each of the transmit and receive FIFO. These status
bits contain the inverted logic states of the TXRDY# A-D outputs and the (un-inverted) logic states of the
RXRDY# A-D outputs. The contents of the FSTAT register are placed on the data bus when the FSRS# pin (pin
76) is a logic 0. Also see FSRS# pin description.
FSTAT[3:0]: TXRDY# A-D Status Bits
Please see Table 5 for the interpretation of the TXRDY# signals.
FSTAT[7:4]: RXRDY# A-D Status Bits
Please see Table 5 for the interpretation of the RXRDY# signals.
40
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
TABLE 19: UART RESET CONDITIONS FOR CHANNELS A-D
REGISTERS
RESET STATE
DLL
Bits 7-0 = 0xXX
DLM
Bits 7-0 = 0xXX
RHR
Bits 7-0 = 0xXX
THR
Bits 7-0 = 0xXX
IER
Bits 7-0 = 0x00
FCR
Bits 7-0 = 0x00
ISR
Bits 7-0 = 0x01
LCR
Bits 7-0 = 0x00
MCR
Bits 7-0 = 0x00
LSR
Bits 7-0 = 0x60
MSR
Bits 3-0 = Logic 0
Bits 7-4 = Logic levels of the inputs inverted
SPR
Bits 7-0 = 0xFF
EMSR
Bits 7-0 = 0x00
FLVL
Bits 7-0 = 0x00
TRG
Bits 7-0 = 0x00
FC
Bits 7-0 = 0x00
FCTR
Bits 7-0 = 0x00
EFR
Bits 7-0 = 0x00
XON1
Bits 7-0 = 0x00
XON2
Bits 7-0 = 0x00
XOFF1
Bits 7-0 = 0x00
XOFF2
Bits 7-0 = 0x00
FSTAT
Bits 7-0 = 0xFF
I/O SIGNALS
RESET STATE
TX
Logic 1
IRTX
Logic 0
RTS#
Logic 1
DTR#
Logic 1
RXRDY#
Logic 1
TXRDY#
Logic 0
INT
IRQ#
XR16C864 = Three-State Condition
Logic 1 (68 mode, INTSEL = 0)
41
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Power Supply Range
7 Volts
Voltage at Any Pin
GND-0.3 V to 7 V
Operating Temperature
-40o to +85oC
Storage Temperature
-65o to +150oC
Package Dissipation
500 mW
TYPICAL PACKAGE THERMAL RESISTANCE DATA (MARGIN OF ERROR: ± 15%)
Thermal Resistance (100-QFP)
theta-ja = 45oC/W, theta-jc = 12oC/W
DC ELECTRICAL CHARACTERISTICS
UNLESS OTHERWISE NOTED: TA=0O TO 70OC (-40O TO +85OC FOR INDUSTRIAL GRADE PACKAGE), VCC IS 2.97 TO
5.5V
SYMBOL
LIMITS
LIMITS
3.3V
5.0V
MIN
MAX MIN
MAX
PARAMETER
UNITS
VILCK
Clock Input Low Level
-0.3
0.6
-0.5
0.6
V
VIHCK
Clock Input High Level
2.4
VCC
3.0
VCC
V
VIL
Input Low Voltage
-0.3
0.8
-0.5
0.8
V
VIH
Input High Voltage
2.0
VCC
2.2
VCC
V
2.0
5.5
2.2
5.5
V
0.4
V
CONDITIONS
(Devices with top mark date code of "DC YYWW" and older)
VIH
Input High Voltage
(Devices with top mark date code of "F2 YYWW" and newer)
VOL
Output Low Voltage
0.4
VOH
Output High Voltage
2.4
V
2.0
Input Low Leakage Current
±10
±10
uA
IIH
Input High Leakage Current
±10
±10
uA
CIN
Input Pin Capacitance
5
5
pF
ICC
Power Supply Current
3
6
mA
100
200
uA
Sleep Current
IOH = -6 mA
IOH = -1 mA
IIL
ISLEEP
IOL = 6 mA
IOL = 4 mA
See Test 1
Test 1: The following inputs remain steady at VCC or GND state to minimize Sleep current: A0-A2, D0-D7, IOR#, IOW#,
CSA#, CSB#, CSC#, and CSD#. Also, RXA, RXB, RXC, and RXD inputs idle at logic 1 state while asleep.
42
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
AC ELECTRICAL CHARACTERISTICS
TA=0O TO 70OC (-40O TO +85OC FOR INDUSTRIAL GRADE PACKAGE), VCC IS 2.97 TO 5.5V
SYMBOL
LIMITS
3.3
PARAMETER
MIN
LIMITS
5.0
MAX
20
MIN
UNIT
CONDITIONS
MAX
CLK
Clock Pulse Duration
15
OSC
Oscillator Frequency
8
24
MHz
OSC
External Clock Frequency
24
32
MHz
TAS
Address Setup Time (16 Mode)
10
5
ns
TAH
Address Hold Time (16 Mode)
10
5
ns
TCS
Chip Select Width (16 Mode)
70
50
ns
TRD
IOR# Strobe Width (16 Mode)
70
50
ns
TDY
Read Cycle Delay (16 Mode)
70
50
ns
TRDV
Data Access Time (16 Mode)
TDD
Data Disable Time (16 Mode)
0
TWR
IOW# Strobe Width (16 Mode)
70
50
ns
TDY
Write Cycle Delay (16 Mode)
70
50
ns
TDS
Data Setup Time (16 Mode)
10
5
ns
TDH
Data Hold Time (16 Mode)
10
5
ns
TADS
Address Setup (68 Mode)
10
10
ns
TADH
Address Hold (68 Mode)
15
15
ns
TRWS
R/W# Setup to CS# (68 Mode)
10
5
ns
TRDA
Read Data Access (68 mode)
TRDH
Read Data Hold (68 mode)
15
15
ns
TWDS
Write Data Setup (68 mode)
20
15
ns
TWDH
Write Data Hold (68 Mode)
10
10
ns
TRWH
CS# De-asserted to R/W# De-asserted (68 Mode)
10
10
ns
TCSL
CS# Strobe Width (68 Mode)
70
50
ns
TCSD
CS# Cycle Delay (68 Mode)
70
70
ns
TWDO
Delay From IOW# To Output
50
40
ns
100 pF load
TMOD
Delay To Set Interrupt From MODEM Input
40
35
ns
100 pF load
TRSI
Delay To Reset Interrupt From IOR#
40
35
ns
100 pF load
70
25
0
70
43
ns
50
ns
15
ns
50
ns
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
AC ELECTRICAL CHARACTERISTICS
TA=0O TO 70OC (-40O TO +85OC FOR INDUSTRIAL GRADE PACKAGE), VCC IS 2.97 TO 5.5V
SYMBOL
LIMITS
3.3
PARAMETER
MIN
LIMITS
5.0
MAX
MIN
UNIT
TSSI
Delay From Stop To Set Interrupt
1
1
Bclk
TRRI
Delay From IOR# To Reset Interrupt
40
40
ns
TSI
Delay From Stop To Interrupt
45
40
ns
TINT
Delay From Initial INT Reset To Transmit Start
24
Bclk
TWRI
Delay From IOW# To Reset Interrupt
45
40
ns
TSSR
Delay From Stop To Set RXRDY#
1
1
Bclk
TRR
Delay From IOR# To Reset RXRDY#
45
40
ns
TWT
Delay From IOW# To Set TXRDY#
45
40
ns
TSRT
Delay From Center of Start To Reset TXRDY#
8
8
Bclk
TRST
Reset Pulse Width
40
N
Baud Rate Divisor
1
Bclk
8
Baud Clock
24
8
40
216-1
1
16X of data rate
FIGURE 13. CLOCK TIMING
CLK
CLK
EXTERNAL
CLOCK
OSC
44
CONDITIONS
MAX
ns
216-1
bps
100 pF load
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 14. MODEM INPUT/OUTPUT TIMING FOR CHANNELS A-D
IO W #
IO W
A c tiv e
TW
RTS#
DTR#
C h a n g e o f s ta te
DO
C h a n g e o f s ta te
CD#
CTS#
DSR#
C h a n g e o f s ta te
C h a n g e o f s ta te
TMOD
TMOD
IN T
A c t iv e
A c t iv e
A c t iv e
T RSI
IO R #
A c tiv e
A c t iv e
A c t iv e
TMOD
C h a n g e o f s ta te
R I#
FIGURE 15. 16 MODE (INTEL) DATA BUS READ TIMING FOR CHANNELS A-D
A0-A7
Valid Address
TAS
TCS
Valid Address
TAS
TAH
TAH
TCS
CS#
TDY
TRD
TRD
IOR#
TDD
TRDV
D0-D7
Valid Data
TDD
TRDV
Valid Data
RDTm
45
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 16. 16 MODE (INTEL) DATA BUS WRITE TIMING FOR CHANNELS A-D
A0-A7
Valid Address
Valid Address
TAS
TAS
TAH
TCS
TAH
TCS
CS#
TDY
TWR
TWR
IOW#
TDH
TDS
D0-D7
TDH
TDS
Valid Data
Valid Data
16Write
FIGURE 17. 68 MODE (MOTOROLA) DATA BUS READ TIMING FOR CHANNELS A-D
A0-A7
Valid Address
TADS
TCSL
Valid Address
TADH
CS#
T CSD
TRWS
TRWH
R/W#
TRDH
TRDA
D0-D7
Valid Data
Valid Data
68Read
46
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 18. 68 MODE (MOTOROLA) DATA BUS WRITE TIMING FOR CHANNELS A-D
A0-A7
Valid Address
TADS
TCSL
Valid Address
TADH
CS#
TCSD
TRWS
TRWH
R/W#
TWDS
D0-D7
T WDH
Valid Data
Valid Data
68Write
FIGURE 19. RECEIVE READY & INTERRUPT TIMING [NON-FIFO MODE] FOR CHANNELS A-D
RX
INT
RXRDY#
Start
Bit
D0:D7
Stop
Bit
D0:D7
D0:D7
TSSR
TSSR
TSSR
1 Byte
in RHR
1 Byte
in RHR
1 Byte
in RHR
TSSR
TSSR
Active
Data
Ready
Active
Data
Ready
TRR
TRR
TSSR
Active
Data
Ready
TRR
IOR#
(Reading data
out of RHR)
RXNFM
47
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 20. TRANSMIT READY & INTERRUPT TIMING [NON-FIFO MODE] FOR CHANNELS A-D
TX
Start
Bit
(Unloading)
IER[1]
enabled
Stop
Bit
D0:D7
D0:D7
ISR is read
D0:D7
ISR is read
ISR is read
INT*
TWRI
TWRI
TWRI
TSRT
TSRT
TSRT
TXRDY#
TWT
TWT
TWT
IOW#
(Loading data
into THR)
*INT is cleared when the ISR is read or when data is loaded into the THR.
TXNonFIFO
FIGURE 21. RECEIVE READY & INTERRUPT TIMING [FIFO MODE, DMA DISABLED] FOR CHANNELS A-D
Start
Bit
RX
S D0:D7
S D0:D7 T
Stop
Bit
D0:D7
S D0:D7 T
S D0:D7 T S D0:D7 T
S D0:D7 T
RX FIFO drops
below RX
Trigger Level
TSSI
INT
FIFO
Empties
TSSR
RX FIFO fills up to RX
Trigger Level or RX Data
Timeout
RXRDY#
First Byte is
Received in
RX FIFO
TRRI
TRR
IOR#
(Reading data out
of RX FIFO)
RXINTDMA#
48
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
FIGURE 22. RECEIVE READY & INTERRUPT TIMING [FIFO MODE, DMA ENABLED] FOR CHANNELS A-D
Start
Bit
RX
Stop
Bit
S D0:D7
S D0:D7 T
D0:D7
S D0:D7 T
S D0:D7 T S D0:D7 T
S D0:D7 T
RX FIFO drops
below RX
Trigger Level
TSSI
INT
RX FIFO fills up to RX
Trigger Level or RX Data
Timeout
FIFO
Empties
TSSR
RXRDY#
TRRI
TRR
IOR#
(Reading data out
of RX FIFO)
RXFIFODMA
FIGURE 23. TRANSMIT READY & INTERRUPT TIMING [FIFO MODE, DMA MODE DISABLED] FOR CHANNELS A-D
TX FIFO
Empty
TX
Start
Bit
Stop
Bit
S D0:D7 T
(Unloading)
IER[1]
enabled
Last Data Byte
Transmitted
T S D0:D7 T S D0:D7 T
S D0:D7 T S D0:D7 T
TSI
ISR is read
S D0:D7 T
ISR is read
TSRT
INT*
TX FIFO fills up
to trigger level
TXRDY#
Data in
TX FIFO
TX FIFO
Empty
TWRI
TX FIFO drops
below trigger level
TWT
IOW#
(Loading data
into FIFO)
*INT is cleared when the ISR is read or when TX FIFO fills up to the trigger level.
49
TXDMA#
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
PACKAGE DIMENSIONS (100 PIN QFP)
50
XR16C864
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 2.2.0
REVISION HISTORY
DATE
REVISION
DESCRIPTION
January 2004
Rev. 2.0
Added Revision History. Changed to standard style format. Clarified
sleep mode conditions. Renamed FIFORdy register to FSTAT register.
Devices with top mark date code of "F2 YYWW" and newer have 5V tolerant inputs (except for XTAL1). Devices with top mark date code of "DC
YYWW" and older do not have 5V tolerant inputs.
April 2004
Rev. 2.0.1
Updated FCTR bit-3 description.
January 2013
Rev 2.1.0
Updated Ordering Information: Removed discontinued part numbers, added
Green/RoHS part numbers and TR part numbers. Updated package drawing.
April 2013
Rev 2.2.0
Updated AC Electrical Characteristics.
ECN 1318-06 04/30/2013
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to
improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any
circuits described herein, conveys no license under any patent or other right, and makes no representation that
the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration
purposes and may vary depending upon a user’s specific application. While the information in this publication
has been carefully checked; no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the
failure or malfunction of the product can reasonably be expected to cause failure of the life support system or
to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless
EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has
been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately
protected under the circumstances.
Copyright 2013 EXAR Corporation
Datasheet April 2013.
Send your UART technical inquiry with technical details to hotline: uarttechsupport@exar.com.
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
51