XR88C92/192
18
Rev. 1.33
Baud Rate Table for a 3.6864MHz clock. Data rates would double for a 7.3728MHz clock.
CLOCK SELECT REGISTER (CSRA, CSRB)
Transmit / Receive baud rates for channels A, B can be
selected via this register.
CSRA, CSRB Bits 3-0.
Transmit clock select(see baud rate table).
CSRA, CSRB Bits 7-4.
Receive clock select (see baud rate table).
COMMAND REGISTER (CRA, CRB)
CRA, CRB register is used to supply commands to A,
B channels respectively. Multiple commands can be
specified in a single write to CRA, CRB as long as
commands are non-conflicting.
CRA, CRB Bits 1-0: Receiver Commands.
0 0 = No Action, Stays in Present Mode (default)
0 1 = Receiver Enabled
1 0 = Receiver Disabled
1 1 = Don’t Use
CRA, CRB Bits 3-2: Transmitter Commands.
0 0 = No Action, Stays in Present Mode (default)
0 1 = Transmitter Enabled
1 0 = Transmitter Disabled
1 1 = Don’t Use
CRA, CRB Bits 7-4: Miscellaneous Commands.
0 0 0 0 = No Command (default).
0 0 0 1 = Reset MR Pointer to MR1.
0 0 1 0 = Reset Receiver. Receiver is disabled and
FIFO is flushed.
0 0 1 1 = Reset Transmitter. Transmitter is disabled
and FIFO is flushed.
0 1 0 0 = Reset Error Status. Clears channel A/B,
break, parity, and over-run error bits in the
status register.
0 1 0 1 = Reset Channel's Break-Change Interrupt.
Clears channel A/B break detect change bit
in the interrupt status register (ISR bit-2 for
channel A and ISR bit-6 for channel B).
* Baud Rate is independent of MR0 bit-0 & bit-2 and ACR bit-7 settings.
MR0A Bits
MR0A Bit-0=1
MR0A Bit-0=0
2,0=0
Bit-2=0
Bit-2=1
(extended table 1)
(extended table 2)
CSRA, CSRB
SET-1
SET-2
SET-1
SET-2
SET-1
SET-2
Bits 7:4 or
ACR
Bits 3:0
Bit-7=0
Bit-7=1
Bit-7=0
Bit-7=1
Bit-7=0
Bit-7=1
0000 (default)
50
75
300
450
4800
7200
0001
110
880
0010
134.5
1076
0011
200
150
1200
900
19.2k
14.4k
0100
300
1800
28.8k
0101
600
3600
57.6k
0110
1200
7200
115.2k
0111
1050
2000
1050
2000
1050
2000
1000
2400
14.4k
57.6k
1001
4800
28.8k
4800
1010
7200
1800
7200
1800
57.6k
14.4k
1011
9600
57.6k
9600
1100
38.4k
19.2k
230.4k
115.2k
38.4k
19.2k
1101
Timer
1110*
IP3-16X (CSRA 3:0), IP4-16X (CSRA 7:4), IP5-16X (CSRB 3:0), IP6-16X (CSRB 7:4)
1111*
IP3-1X (CSRA 3:0), IP4-1X (CSRA 7:4), IP5-1X (CSRB 3:0), IP6-1X (CSRB 7:4)