參數(shù)資料
型號: XR17L152
廠商: Exar Corporation
英文描述: 3.3V PCI BUS DUAL UART
中文描述: 3.3V的PCI總線雙UART
文件頁數(shù): 35/55頁
文件大?。?/td> 318K
代理商: XR17L152
XR17L152
3.3V PCI BUS DUAL UART
REV. 1.1.0
á
DISCONTINUED
35
Line Control Register (LCR)
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.
T
ABLE
13: T
RANSMIT
AND
R
ECEIVE
FIFO T
RIGGER
L
EVEL
S
ELECTION
FCTR
B
IT
-7
FCTR
B
IT
-6
FCR
B
IT
-7
FCR
B
IT
-6
FCR
B
IT
-5
FCR
BIT
-4
R
ECEIVE
T
RIGGER
L
EVEL
T
RANSMIT
T
RIGGER
L
EVEL
C
OMPATIBILITY
0
0
0
0
1
1
0
1
0
1
0
0
1 (default)
4
8
14
1 (default)
Table-A. 16C550, 16C2550,
16C2552, 16C554, 16C580
compatible.
0
1
0
0
1
1
0
1
0
1
0
0
1
1
0
1
0
1
8
16
24
28
16
8
24
30
Table-B. 16C650A compatible.
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 RXTRG reg-
ister
Programmable
via TXTRG reg-
ister
Table-D. 16C850, 16C2850,
16C2852, 16C854, 16C864,
16C872 compatible.
BIT-1
BIT-0
W
ORD
LENGTH
0
0
5 (default)
0
1
6
1
0
7
1
1
8
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