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在LPM3.5睡眠模式下外IO中断唤醒，和RTC唤醒，分别从什么地方执行程序，能否对原有中断进行响应？何时响应？
只要是从x.5模式下唤醒，都会导致BOR，程序会Reset，从0x0FFFE地址中系统重置向量指定的地址开始执行程序。
因为会导致BOR，所以绝大部分寄存器都会被重置，原有中断会被清除
