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MSP430内部的RTC

请问430内部的RTC模块在设置好后,如果掉电的话还能继续工作吗?比如我设计的是电池供电,需要更换电池时,430内部是否有储电的大电容,能维持RTC工作一段时间?还有这个精度怎么样呢,如果连续工作今天的话会有很大的误差吗?