xr17v254 Exar Corporation, xr17v254 Datasheet - Page 51

• Manufacturer Part Number: xr17v254
• Description: 66mhz Pci Bus Quad Uart With Power Management Support
• Manufacturer: Exar Corporation

REV. 1.0.0
MSR [3]: Transmitter Disable (requires EFR bit [4]=1)
This bit can be used to disable the transmitter by halting the Transmit Shift Register (TSR). When this bit is set
to a ’1’, the bytes already in the FIFO will not be sent out. Also, any more data loaded into the FIFO will stay in
the FIFO and will not be sent out. When this bit is set to a ’0’, the bytes currently in the TX FIFO will be sent
out. Please note that setting this bit to a ’1’ stops any character from going out. Also, this bit must be a ’0’ for
Send Char Immediate function (see MCR[3]).
•
•
Logic 0 = Enable Transmitter (default).
Logic 1 = Disable Transmitter.
T
ABLE
18: A
UTO
MSR[7]
RS485 H
0
0
0
0
0
9
0
0
1
1
1
1
1
1
1
1
MSR[6]
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
ALF
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
-
DUPLEX
MSR[5]
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D
IRECTION
MSR[4]
51
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
C
ONTROL
D
ELAY IN
D
ELAY FROM
D
ATA
10
12
13
14
15
11
0
1
2
3
4
5
6
7
8
9
B
IT
T
(
S
RANSMIT
) T
IME
-
TO
-R
XR17V254
ECEIVE