XR16C872 Datasheet, PDF (53/60 Pages) Exar Corporation – DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER

DISCONTINUED
XR16C872
INT
(THR Empty
Interrupt)
IOW#
D0-D7
TX
Active
Active
Active
T18D
Active
T19D
T17D
Active
Active
Data
Byte 1
Data
Byte 2
Data
Byte 3
START
BIT
DATA BITS (5-8)
D
D
D
D
D
D
D
D
0
1
2
3
4
5
6
7
STOP
BIT
PARITY
NEXT
5 DATA BITS
BIT
DATA
START
BIT
6 DATA BITS
7 DATA BITS
16 BAUD RATE CLOCK
Transmit Data Timing
XR872TX
INT
(THR Empty
Interrupt)
IOW#
TX Data
Fills FIFO
Rev. 1.00
TX is sent and
FIFO gets empty
to Trigger Level
TX FIFO gets
more data
XR872TFIFO
Transmit FIFO Operation
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