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28335的adc模块的模拟输入范围为0~3v，如果adc基准电压选择为外部2.048v输入时，请问转换结果全为1时对应的是+3v还是+2.048v？如果是+2.048v，为什么输入电压可以大于基准电压，它内部是怎么处理的？
