xr16c854iv Exar Corporation, xr16c854iv Datasheet - Page 30

• Manufacturer Part Number: xr16c854iv
• Description: Quad Uart With Rx/tx Fifo Counters And 128-byte Fifo
• Manufacturer: 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
0
1
0
1
X
LENGTH
BIT-0
5,6,7,8
-4
W
6,7,8
0
1
0
1
R
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
5 (default)
ORD LENGTH
1 (default)
IT TIME
Programmable
FCTR[7] = 1.
1-1/2
6
7
8
T
2
T
via TRG
register.
RANSMIT
RIGGER
L
EVEL
16
32
56
L
(
8
S
EVEL
))
S
ELECTION
Table-C. 16C654 compatible.
Table-D. 16L2750, 16C2850,
16C2852, 16C850, 16C864
compatible.
C
OMPATIBILITY
xr
REV. 3.0.1