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进入低功耗LPM3模式一个多小时后,IO中断唤醒不了MCU



MCU进入低功耗LPM3模式后,短时间内可以通过IO 中断唤醒,大概一个多小时后,IO中断唤醒不了MCU,请问是什么原因造成的?

有可能是IO寄存器配置低功耗模式下不能长期保持吗???求大神解答。。。