XR16C872 Datasheet, PDF (45/60 Pages) Exar Corporation – DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER

DISCONTINUED
XR16C872
UART Registers Reset Conditions
REGISTER RESET STATE
RHR
THR
IER
FCR
ISR
LCR
MCR
LSR
MSR
SPR
DLL
DLM
TRG
FCTR
EFR
Xon-1
Xon-2
Xoff-1
Xoff-2
EMSR
0xXX, X=random
0xXX, X=random
0x00
0x00
0x01
0x00
0x00
0x60
0xX0, X=state of input pins
0xFF
0xXX, X=random
0xXX, X=random
0x00
0x00
0x00
0x00
0x00
0x00
0x00
0x00
OUTPUT
SIGNALS
TX A-B
RTS# A-B
DTR# A-B
RESET STATE
logic 1
logic 1
logic 1
1284 Controller Register Reset Conditions
REGISTER RESET STATE
ECP-AFIFO
DSR
DCR
EPP-APort
EPP-DPortA
EPP-DPortB
EPP-DPortC
EPP-DPortD
CONF-A
CONF-B
ECR
0xXX, X=state of input pins
Bit 0-4=0
Bit 0-7=0
Bit 0-5=0
0x95
Rev. 1.00
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