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MSP430F67791: 主电源上电RTC不工作

Part Number: MSP430F67791

您好,我使用备份电源给RTC供电。主电源上电后设置RTC后工作正常。关闭主电源以后重新上电,RTC不工作,读到的时间是上电时的时间。只有重新清除RT0PSHOLD,RT1PSHOLD,RTCHOLD以后,RTC才开始重新工作。所以每次重新上主电源,都要延时一会儿。请问,这个问题怎么解决。

谢谢 

 Yu xueming