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TMS320F28377S: gpio41脚设置成输入模式,实测对gnd为40mv,内部数据寄存器缺为1

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GPIO41设置为输入,无上下拉模式,芯片外部GPIO41通过电阻接GND,测试GPIO41对GND的电压为0.02V,输入寄存器GPIO41的状态是1,这是为何?