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28335 数据接口输出电平不稳定

您好:

      28335 数据接口输出的电平不稳定是什么原因呢?通过示波器观察到,输出的瞬间脉冲超出了4v,而在低电平的时候都没有达到0V。感觉不稳定。

非常感谢!