參數(shù)資料
型號: XR17V254IV-F
廠商: Exar Corporation
文件頁數(shù): 14/70頁
文件大?。?/td> 0K
描述: IC UART PCI BUS QUAD 144LQFP
標(biāo)準(zhǔn)包裝: 60
特點: *
通道數(shù): 4,QUART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 3.3V,5V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
安裝類型: 表面貼裝
封裝/外殼: 144-LQFP
供應(yīng)商設(shè)備封裝: 144-LQFP(20x20)
包裝: 托盤
XR17V254
21
REV. 1.0.1
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
1.6.3
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 with logic one selects 8X sampling rate. Transmit and receive data rates will double by
selecting 8X.
1.6.4
REGA [15:8] (default 0x00) Reserved
1.6.5
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 21 for details. bit [0] =1 resets UART channel 0 with bit
[7]=1 resets channel 7.
FIGURE 8. INTERRUPT OUTPUT (ACTIVE LOW) IN ONE-SHOT AND RE-TRIGGERABLE MODES
One-shot Mode
Timer Started
Timer Timed
Out
TIMERCNTL
read
Re-triggerable
Mode
Timer Timed
Out
TIMERCNTL
read
Timer Timed
Out
Rsvd
Rsvd Rsvd 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
Rsvd
Rsvd Rsvd 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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