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MSP430f169单片机我想用P4.5先输出再用P4.5检测管脚的状态

Other Parts Discussed in Thread: MSP430F169

我用MSP430f169单片机的P4.5控制继电器的开关,再用P4.5检测管脚的状态,但一直都不成功,请大神帮帮忙这事怎么回事啊!