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我有两个问题：1.我采用2812ADC内部参考，请问内部参考电压为3v吗，我ADCREFM和ADCREFP都是通过电容接地。2.调试时我直接在ADCINA0(174腿)加上一个直流电压为1.2v，读到AdcRegs.RESULT0左移后的结果为1606，但重新下载程序后仿真，有时结果为1818.这是为什么？
见手册：
The on-chip ADC has a built-in reference, which provides the reference voltages for the ADC. ADCVREFPis set to 2.0 V and ADCVREFM is set to 1.0 V.
Eric
