1.RC复位电路选择的是10K和0.1uF，系统Vcc=3.3V,系统工作频率为20MHz，AD的fadc12=2.5MHz
2.系统上电之后，系统初始化AD部分失败，可能整个系统无法正常启动，系统按下复位按钮之后，又都可以正常启动了。
3.所有的调试用的程控电源，精度和速度都没有什么问题。
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