xr17v254 Exar Corporation, xr17v254 Datasheet - Page 21

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

REV. 1.0.0
Each bit selects 8X or 16X sampling rate for that UART channel, bit [0] is channel 0. Logic 0 (default) selects
normal 16X sampling with logic one selects 8X sampling rate. Transmit and receive data rates will double by
selecting 8X.
The 8-bit Reset register [RESET] provides the software with the ability to reset the UART(s) when there is a
need. Each bit is self-resetting after it is written a logic 1 to perform a reset to that channel. All registers in that
channel will be reset to the default condition, see
[7]=1 resets channel 7.
F
1.6.3
1.6.4
1.6.5
IGURE
Re-triggerable
One-shot Mode
Mode
8. I
8XMODE [7:0] (default 0x00)
REGA [15:8] (default 0x00) Reserved
RESET [23:16] (default 0x00)
NTERRUPT
O
UTPUT
Timer Started
(
ACTIVE
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
Rsvd
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Rsvd
Individual UART Channel 8X Clock Mode Enable
LOW)
Individual UART Channel Reset Enable
Rsvd
Rsvd
Rsvd Rsvd Ch-3 Ch-2 Ch-1 Ch-0
IN
Rsvd Rsvd Ch-3 Ch-2 Ch-1 Ch-0
8XMODE Register
O
RESET Register
Table 21
NE
Timer Timed
-S
Out
21
HOT AND
for details. bit [0] =1 resets UART channel 0 with bit
R
TIMERCNTL
E
-
TRIGGERABLE
read
Timer Timed
Out
M
ODES
TIMERCNTL
read
XR17V254
Timer Timed
Out