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MSP430FR5738: IO口输入模式检测 上电后电平判断错误

Part Number: MSP430FR5738

P1.3 io口配置成输入模式,并且外部通过这种方式输入检测。上电后发现,会一直检测到低电平,而光耦是没有导通的。  必须光耦导通一次,输入才会判断正常。 

在上电后测试输入电压,一直为高电平,但程序却判断一直为低。