逝去时间时钟记录的是CPU通电至目前的时间间隔，发生电源故障此数据不会保持，每次上电这个时钟都会回0并重新计时。从这个时钟开始计时到时钟计时计时值自动回0(中间没有电源故障或停/上电情况，精确到秒)的时间间隔大约为100年。
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