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msp430g2553输入口检测不到ID卡返回波形的高电平。



设置IO口为输入口高阻态,利用输入直接检测波形的高低电平,从而解码。波形的高3.3V,低70MV。只能检测到低电平,高电平检测不到,是怎么回事儿?

希望高手解答,万分感谢!