逝去時間時鐘記錄的是CPU通電至目前的時間間隔，發(fā)生電源故障此數(shù)據(jù)不會保持，每次上電這個時鐘都會回0并重新計時。從這個時鐘開始計時到時鐘計時計時值自動回0(中間沒有電源故障或停/上電情況，精確到秒)的時間間隔大約為100年。

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