MSP怎么输出参考电压，adc有内部参考电压，我想再输出一个高于adc参考电压的电压，比如adc内部参考电压是1.5V 而我想再在引脚输出一个2.5V的电压 这样就可以分压测试外部的电阻了 （比如PT100）这样可以吗！求赐教
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