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CC430F5137上电后不复位



之前使用电池供电,复位正常,现在换了一个220V转5V的模块,又转成了3V供电给单片机,上电之后单片机就不复位。

上拉电阻为56k欧,复位电容用的0.1uF,用万用表测电容两端电压是2.6V。

请问这是为什么?