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MSP430i2041死机

Other Parts Discussed in Thread: MSP430I2041

我们现在用MSP430i2041单片机,四个模块供电分别接电池,通信口光耦隔离并级联,现在发现四个模块同时死机,指示灯不亮,通过RST口复位,也不起作用,只有模块重新断电后再上电才能恢复正常工作。请问这种情况是咋样引起?单片机进入什么状态?有哪些措施可以解决?