Patent ID: 8488506
Filing Date: 2013-07-16
Classification: G06F,H03L,H04W,Y02D

Abstract:
1. An apparatus, comprising: an oscillator configured to awaken from a sleep mode at a predetermined time, wherein the oscillator is further configured to oscillate at an output frequency; a clock configured to maintain a sleep clock when the oscillator is asleep; and oscillator detection and control circuitry coupled to the clock and the oscillator, wherein the oscillator detection and control circuitry is configured to: receive the sleep clock from the clock and provide a power-on indication to the oscillator; detect an edge transition of an oscillation of the oscillator; measure a time from the power-on indication to edge transition detection; and store the measured time; wherein the measured time is used to awaken the oscillator at a first time, wherein the first time is different than the predetermined time.