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用MSP430F149 ADC测量电压的话,那么测量电压范围是在参考电压范围以内是吗?比如说参考电压用的内部的2.5V,那么想要测量的电压不能超过2.5V是吗?如果参考电压用的外部电压,那么参考电压不能大于供电电压是吗?也就是说想要测量的电压不能大于供电电压是吗?