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AD,低功耗



程序使用定时唤醒采样方式,每隔一段时间唤醒,进行AD采样。问题在于,如果不使用内部2.5V基准电压,进入低功耗时候,电流在20uA左右;使用内部2.5V基准电压,进入低功耗前关闭(ADC12CTL0 &= ~(ADC12ON + REFON);),结果进入低功耗时,电流在500uA左右,这是为什么?