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我用28027SCI通信，然后外部5V电源供电的时候板子仿真器附近的TX，RX指示灯会亮。然后就无法正常通信了。当用电脑上的USB供电就可以正常通信，只有收发数据的时候指示灯才亮。
楼主， 你的外部5V电源是如何实现的？开关电源的话会不会干扰太严重？
