参数资料
型号: XR17V254IV-F
厂商: Exar Corporation
文件页数: 17/70页
文件大小: 0K
描述: IC UART PCI BUS QUAD 144LQFP
标准包装: 60
特点: *
通道数: 4,QUART
FIFO's: 64 字节
规程: RS485
电源电压: 3.3V,5V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
安装类型: 表面贴装
封装/外壳: 144-LQFP
供应商设备封装: 144-LQFP(20x20)
包装: 托盘
XR17V254
24
66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT
REV. 1.0.1
MPIOINT [7:0] (default 0x00)
Enable multipurpose input pin interrupt. If the pin is selected by MPIOSEL as input then bit [0] enables input
pin 0 for interrupt, and bit [7] enables input pin 7. No interrupt is enable if the pin is selected to be an output.
The interrupt is edge sensing and determined by MPIOINV and MPIOLVL registers. The MPIO interrupt clears
after a read to register MPIOLVL. The combination of MPIOLVL and MPIOINV determines the interrupt being
active LOW or active high, it’s level trigger. Logic LOW (default) disables the pin’s interrupt and logic HIGH
enables it.
MPIOLVL [7:0] (default 0x00)
Output pin level control and input level status. The status of the input pin(s) is read on this register and output
pins are controlled on this register. A logic 0 (default) sets the output to LOW and a logic 1 sets the output pin
to HIGH. The MPIO interrupt will clear upon reading this register.
FIGURE 9. MULTIPURPOSE INPUT/OUTPUT INTERNAL CIRCUIT
MPIO
Pin [7:0]
MPIOLVL [7:0]
Read Input Level
MPIOINT [7:0]
Rising Edge
Detection
INT
OR
AND
1
0
MPIOSEL [7:0]
(Select Input=1, Output=0 )
MPIO3T [7:0]
(3-state Enable =1)
MPIOLVL [7:0]
(Output Level)
MPIOINV [7:0]
(Input Inversion Enable =1)
MPIOCKT
MPIO6
MPIO7
MPIO5 MPIO4 MPIO3 MPIO2 MPIO1 MPIO0
MPIOINT Register
Multipurpose Input/Output Interrupt Enable
Bit-7 Bit-6 Bit-5 Bit-4 Bit-3 Bit-2 Bit-1 Bit-0
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