利用msp430f5418a单片机内部ADC模块的INCH11通道采集系统内部的Avcc数字电压值在2048左右（系统外部的AVcc为参考电压），其中系统的模拟电压为3.6V，当用直流可调电压源将系统电压降低至3.6V后，采集的数字电压应该会随着可调电压值的减小而减小，但是当模拟电压降低后，数字电压并没有降低；为什么？
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