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看这个资料,从手册研究出来的,那个最大ADC输入能力为1.5V,这说明是参考Verf=1.5V。大概是这样的。最大就是最大量程。根据结构图,是内部的参考电压,所以没有端口,我看了端口表,也没找到,好多人的例程里,也没有提到配置什么接口作为参考