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5438A BSL电路芯片CH340通电，MCU就不工作，一般做法是用跳帽将CH340引脚和MCU隔离，有没有办法不用跳帽隔离，可以实现既可以用用USB口供电，程序正常运行，也可以用USB口进行BSL下载？
可以参考下这个帖子
bbs.21ic.com/icview-819494-1-1.html
谢谢你的解答，我想到了办法解决，将RST信号通过按键隔离，按键按下时候，CH340芯片起作用，按键松开，CH340就不起作用了。
