XR16C854CQ EXAR [Exar Corporation], XR16C854CQ Datasheet - Page 30

• Manufacturer Part Number: XR16C854CQ
• Description: 2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
• Manufacturer: EXAR [Exar Corporation]

XR16C854/854D
2.97V TO 5.5V QUAD UART WITH 128-BYTE FIFO
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.
4.6
FCTR
B
IT
1
1
-5
Line Control Register (LCR) - Read/Write
FCTR
B
IT
0
1
-4
B
FCR
IT
X
0
0
1
1
-7
T
ABLE
B
FCR
IT
0
1
0
1
X
11: T
-6
BIT-1
BIT-2
RANSMIT AND
0
0
1
1
0
1
1
B
FCR
IT
X
0
0
1
1
-5
BIT
FCR
X
0
1
0
1
LENGTH
BIT-0
5,6,7,8
-4
W
6,7,8
R
0
1
0
1
ORD
5
ECEIVE
T
Programmable
FCTR[7] = 0.
RIGGER
R
via TRG
register.
30
ECEIVE
16
56
60
FIFO T
8
L
EVEL
S
W
TOP BIT LENGTH
(B
RIGGER
ORD LENGTH
5 (default)
1 (default)
IT TIME
Programmable
FCTR[7] = 1.
1-1/2
6
7
8
T
2
T
via TRG
register.
RANSMIT
L
RIGGER
EVEL
L
16
32
56
(
8
S
EVEL
))
S
ELECTION
Table-C. 16C654 compatible.
Table-D. 16L2750, 16C2850,
16C2852, 16C850, 16C864
compatible.
C
OMPATIBILITY
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REV. 3.0