xr17v258 Exar Corporation, xr17v258 Datasheet - Page 23

• Manufacturer Part Number: xr17v258
• Description: 66mhz Pci Bus Octal Uart With Power Management Support
• Manufacturer: Exar Corporation

xr
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-clearing 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
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 OCTAL UART WITH POWER MANAGEMENT SUPPORT
Ch-7
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Ch-7
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Individual UART Channel 8X Clock Mode Enable
Ch-6
LOW)
Individual UART Channel Reset Enable
Ch-6
Ch-5 Ch-4 Ch-3 Ch-2 Ch-1 Ch-0
Ch-5 Ch-4 Ch-3 Ch-2 Ch-1 Ch-0
IN
8XMODE Register
RESET Register
O
NE
Table 21
Timer Timed
-S
Out
23
HOT AND
for details. .
R
TIMERCNTL
E
-
TRIGGERABLE
read
Timer Timed
Out
M
ODES
TIMERCNTL
read
Timer Timed
XR17V258
Out