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XRT16C854 Datasheet(PDF) 30 Page - Exar Corporation

Part # XRT16C854
Description  2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XRT16C854 Datasheet(HTML) 30 Page - Exar Corporation

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XR16C854/854D
xr
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
REV. 3.0.1
30
4.6
Line Control Register (LCR) - Read/Write
The Line Control Register is used to specify the asynchronous data communication format. The word or
character length, the number of stop bits, and the parity are selected by writing the appropriate bits in this
register.
LCR[1:0]: TX and RX Word Length Select
These two bits specify the word length to be transmitted or received.
LCR[2]: TX and RX Stop-bit Length Select
The length of stop bit is specified by this bit in conjunction with the programmed word length.
1
0
0
0
1
1
0
1
0
1
0
0
1
1
0
1
0
1
8
16
56
60
8
16
32
56
Table-C. 16C654 compatible.
1
1
X
X
X
X
Programmable
via TRG
register.
FCTR[7] = 0.
Programmable
via TRG
register.
FCTR[7] = 1.
Table-D. 16L2750, 16C2850,
16C2852, 16C850, 16C864
compatible.
BIT-1
BIT-0
WORD LENGTH
0
0
5 (default)
0
1
6
1
0
7
1
1
8
BIT-2
WORD
LENGTH
STOP BIT LENGTH
(BIT TIME(S))
0
5,6,7,8
1 (default)
1
5
1-1/2
1
6,7,8
2
TABLE 11: TRANSMIT AND RECEIVE FIFO TRIGGER LEVEL SELECTION
FCTR
BIT-5
FCTR
BIT-4
FCR
BIT-7
FCR
BIT-6
FCR
BIT-5
FCR
BIT
-4
RECEIVE
TRIGGER LEVEL
TRANSMIT
TRIGGER
LEVEL
COMPATIBILITY


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