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TCA9535: 时钟消失,无法正确读取数值

Part Number: TCA9535

使用此器件时,若将P7和P17配置为输入,时钟就没有了,如果使用默认输入,接入P0和P17后依旧没有时钟,这是什么原因?电路如下图所示: