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？
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