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PA3 引脚作为输入有些问题;

Other Parts Discussed in Thread: CC2538

    我用的是CC2538DK ,cc2538的PA3引脚作为板子上的选择按键,我现在把这个选择按键改为其他值,为了不和其他值冲突,然后我分别设置PA3PA4PA5PA6为输入模式,在调试的时候,PA456三个引脚都好使,唯有PA3出问题,PA3接低电平后,串口就输出不来数据;这个是怎么回事呢?