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AD采样和按键中断干扰的奇怪问题



在c2000 launchpad上使用了J2.10作为AD采样的输入,测试下来比较准确;不过再加入了一个J1-7的按键中断以后AD变得不准确了,就是3.3v输入采样结果却是3.25x左右,这是为什么?

电磁干扰?