XR16C872 Datasheet, PDF (21/60 Pages) Exar Corporation – DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER

DISCONTINUED
XR16C872
UART INTERNAL REGISTERS (continue)
A2 A1 A0
Register
[Default]
Note *3
BIT-7
BIT-6
BIT-5
BIT-4
BIT-3
Enhanced Registers are accessible only when LCR is set to 0xBF.
BIT-2
BIT-1
BIT-0
000
001
010
100
101
TRG [00]
FCTR [00]
EFR [00]
Xon-1[00]
Xon-2[00]
Trig/
FC
Trig/
FC
Trig/
FC
Trig/
FC
Trig
FC
Rx/Tx
Mode
Auto
CTS
SPR/EMSR
Select
Auto
RTS
Trig
Trig
bit-1
bit-0
Special
Char.
select
11111111111112222222222222_IbSEIbE3333333333333_iRMnitRt4444444444444_4ss,aC-5555555555555_bF47b5R6666666666666_iC-,-tl57se7777777777777_R, 8888888888888
RS485
Auto
control
Cont-3
Tx,Rx
Control
bit-7
bit-6
bit-5
bit-4
bit-3
bit-15 bit-14 bit-13 bit-12 bit-11
Trig/
FC
IrRx
Inv.
Trig/
FC
Trig/
FC
RTS
RTS
Hysteresis Hysteresis
bit-1
bit-0
Cont-2
Tx,Rx
Control
Cont-1
Tx,Rx
Control
Cont-0
Tx,Rx
Control
bit-2
bit-10
bit-1
bit-9
bit-0
bit-8
110
111
Xoff-1[00]
Xoff-2[00]
bit-7
bit-15
bit-6
bit-14
bit-5
bit-13
bit-4
bit-12
bit-3
bit-11
bit-2
bit-10
bit-1
bit-9
bit-0
bit-8
EMSR Register is accessible only when FCTR bit 6 is set to logic 1.
1 1 1 EMSR [00]
Not
Used
Not
Used
RTS
RTS Reserved Reserved
Hysteresis Hysteresis
bit-3
bit-2
ALT.
Rx/Tx
FIFO
Count
Rx/Tx
FIFO
Count
Note *3: The value represents the register’s initialized HEX value. An “X” signifies a 4-bit un-initialized nibble.
Rev. 1.00
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