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DM368的ADC采集时信号被拉高



各位,我现在出现这样一种情况:

我在DM368上用one shot模式进行AD采集,选择通道1,其它通道不选,不使用任何中断。start位为0的时候,用示波器测得电压为1.2V,但当我把start位置为1的时候,电压瞬间被拉高到2V,当start位自动变回0时,电压又恢复到1.2V。

请问这是怎么回事?