P6口上电后就有2.7V左右电压。将外部待采集电压接入后外部电压受到IO口输出电压的影响改变实际电压。特别是当采集小电压（零点几伏）时，电压被拉高到1.6V左右。请问这问题该如何解决？？感谢解答！！
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