Patent ID: 9342054
Filing Date: 2016-05-17
CPC Classification: G04G

Claim Text:
1. A method of generating accurate time of day in a low power SLEEP mode, comprising the steps of: generating a first clock and a second clock, both the frequency and the accuracy of the first clock being higher than that of the second clock, while the first clock is associated with larger power consumption than the second clock; setting an initial value for an accumulating number that is used to track the cycles of the first clock; during a plurality of consecutive second clock cycles, adding a cycle number to the accumulating number in each of the plurality of consecutive second clock cycles and enabling the first clock to compensate the accumulating number at an update frequency, the cycle number being associated with the number of cycles of the first clock within a cycle of the second clock; and increasing the time of day by an interval of time when the accumulating number reaches a predetermined target number representative of a number of cycles.