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MSP430FR5949 的ADC12转化值不变的问题,是怎么回事

我初始化函数里面初始化的采样保持时间是 ADC12SHT0_8;

每次进入250us中断后,所有的值都不变,好像是ADC没有转化。这是什么原因,重新下载程序后,转换又正常,这个问题是偶然出现的,是什么原因呢。