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AM3352断电后只采用电池供电RTC停止不走



我们自己的开发板,接外部电源的时候RTC正常。断掉外部电源只采用电池给RTC供电时RTC就停留在断电时候的时间不走,RTC时钟用的外部时钟,32K晶振工作正常。同样的情况发生在WinCE和Linux下面。求教!