Patent ID: 8117465

Claim:
A power control method of a mobile device, the method comprising the steps of: (a) receiving an externally triggered power control signal and accordingly generating an interrupt request (IRQ) at a first time point; (b) receiving the IRQ and accordingly executing a synchronization processing procedure; (c) storing data of a temporary cache area to a permanent storing area according to the synchronization processing procedure; and (d) calculating a first time period between a present time point and the first time point and determining whether the first time period reaches a maximum waiting period, wherein a power operation is performed according to the power control signal when the maximum waiting period is reached, wherein the step (d) further comprises: (d1) judging whether the data of the temporary cache area is completely stored at a second time point when the first time period is shorter than the maximum waiting period and equal to a waiting period, wherein a period between the second time point and the first time point is equal to the waiting period.