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关于TMS320F28335 AD 内部基准源的问题

Other Parts Discussed in Thread: TMS320F2812, CONTROLSUITE

在TMS320F2812芯片中, 使用AD内部基准源,ADCREFM和ADCREFP分别为1.0V和2.0V,在28335中也有这两个引脚,硬件和软件使用与2812相同配置,测量两个引脚的电平是1.4V和0.6V,是否正确?或者内部基准源使用方法是什么?