XR16C872CQ EXAR [Exar Corporation], XR16C872CQ Datasheet - Page 53

• Manufacturer Part Number: XR16C872CQ
• Description: DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER
• Manufacturer: EXAR [Exar Corporation]

Rev. 1.00
(THR Empty
Fills FIFO
Interrupt)
( T H R E m p t y
TX Data
Interrupt)
I O W #
INT
D 0 - D 7
I O W #
T X
I N T
A c t i v e
A c t i v e
B y t e 1
D a t a
S T A R T
T 1 8 D
B I T
Transmit FIFO Operation
D
0
Transmit Data Timing
A c t i v e
A c t i v e
B y t e 2
D a t a
DISCONTINUED
D
1
5 D A T A B I T S
1 6 B A U D R A T E C L O C K
D
2
6 D A T A B I T S
FIFO gets empty
T 1 9 D
to Trigger Level
TX is sent and
53
7 D A T A B I T S
D A T A B I T S ( 5 - 8 )
D
3
D
4
D
5
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D
6
D
7
TX FIFO gets
P A R I T Y
T 1 7 D
more data
B I T
XR16C872
S T O P
B I T
A c t i v e
A c t i v e
B y t e 3
N E X T
D A T A
S T A R T
B I T
D a t a
X R 8 7 2 T X
XR872TFIFO