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  • Chapter4 数字I/O模块

    1、数字I/O模块概述

      MSP430拥有12组数字I/O端口,为P1到P11和PJ,每个端口8位。可按位设置输入输出、片内上下拉及外设复用模式。P1和P2具有中断功能,可设置中断脉冲沿类型。

    2、数字I/O模块寄存器设置

      ①PxIN(Input Registers)

        Bit=0:Input is low

        Bit=1:Input is high

      ②PxOUT(Output Registers)

       When configured as I/O function, OUTPUT direction.

        Bit=0:Output is low

        Bit=1:Output is high

       When configured as I/O function, INPUT direction and the Pullup/Pulldown resistor is enabled.

        Bit=0:Pin is pulled down

        Bit=1:Pin is pulled up

      ③PxDIR(Direction Registers)

        Bit=0:Port pin is switched to input direction

        Bit=1:Port pin is switched to output direction

      ④PxREN(Pullup or Pulldown Resistor Enable Registers)

        Bit=0:Pullup/pulldown resistor disabled

        Bit=1:Pullup/pulldown resistor enabled

      ⑤PxDS(Output Drive Strength Registers)

        Bit=0:Reduced drive strength

        Bit=1:Full drive strength

      ⑥PxSEL(Function Select Registers)

        Bit=0:I/O Function is selected for the pin

        Bit=1:Peripheral module is selected for the pin

      Warnin:Setting PxSEL does not automatically set the pin direction.

    3、中断端口P1,P2相关寄存器

      ①PxIFG(Interrupt Flag)

        Bit=0:No interrupt is pending

        Bit=1:An interrupt is pending

      Warning:MSP430为边沿触发中断

      ②PxIES(Interrupt Edge Select Registers)

        Bit=0:Respective PxIFG flag is set with a low-to-high transtion

        Bit=1:Respective PxIFG flag is set with a high-to-low transtion

      ③PxIE(Interrupt Enable Registers)

        Bit=0:The Interrupt is disabled

        Bit=1:The Interrupt is enabled

      ④PxIV(Interrupt Vector)    16位

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  • 原文地址:https://www.cnblogs.com/starle/p/5613498.html
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