参数资料
型号: XR17C158CV-0A-EVB
厂商: Exar Corporation
文件页数: 10/67页
文件大小: 0K
描述: EVAL BOARD FOR XR17C158-A 144TQF
标准包装: 1
系列: *
XR17C158
xr
5V PCI BUS OCTAL UART
REV. 1.4.3
18
TIMERMSB [31:24] and TIMERLSB [23:16]
TIMERMSB and TIMERLSB form a 16-bit value. The least-significant bit of the timer is bit [0] of the TIMERLSB
with most-significant-bit being bit [7] in TIMERMSB. Notice that these registers do not hold the current counter
value when read. Reading the TIMERCNTL register will clear its interrupt. Default value is zero (timer disabled)
upon powerup and reset.
1.2.3
8XMODE [7:0] (default 0x00)
Each bit selects 8X or 16X sampling rate for that UART channel, bit-0 is channel 0. Logic 0 (default) selects
normal 16X sampling and logic 1 selects 8X sampling rate. Transmit and receive data rates will double by
selecting 8X sampling rate.
1.2.4
REGA [15:8] Reserved
1.2.5
RESET [23:16] (default 0x00)
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 Table 19 for details. Bit-0 =1 resets UART channel 0 while
bit-7=1 resets channel 7.
TIMERMSB Register
Bit-15 Bit-14 Bit-13 Bit-12 Bit-11 Bit-10
Bit-9 Bit-8
TIMERLSB Register
Bit-7
Bit-6
Bit-5
Bit-4
Bit-3
Bit-2
Bit-1 Bit-0
16-Bit Timer/Counter Programmable Registers
Ch-6
Ch-7
Ch-5 Ch-4 Ch-3 Ch-2 Ch-1 Ch-0
8XMODE Register
Individual UART Channel 8X Clock Mode Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
Ch-6
Ch-7
Ch-5 Ch-4 Ch-3 Ch-2 Ch-1 Ch-0
RESET Register
Individual UART Channel Reset Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
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