MSP430F5659，板子上有一个旋钮式开关控制P1.1、P1.2、P1.4、P1.5四个IO口，带上拉电阻，正行状态时只有一个口为低电平；现在的现象是长时间断电后重新上电，然后读P1IN，竟然有3个IO为低电平，但是如果断电后立即上电P1IN状态就正常，只有一个为低电平，下面是测试程序；想请教一下有可能是什么原因引起的？
=>补充：用万用表测量IO电压正常，3个高电平1个低电平
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