Patent ID: 7587189

Claim:
An apparatus, comprising a clock measurement and processing circuit that is operative to determine a first frequency corresponding to a first clock signal received thereby; a radio frequency circuit, communicatively coupled to the clock measurement and processing circuitry, that operates using a second clock signal having a second frequency; a baseband processing circuitry, communicatively coupled to the clock measurement and processing circuitry, that operates using a third clock signal having a third frequency; and a low power oscillator, communicatively coupled to the clock measurement and processing circuitry, that is operative to provide a fourth clock signal having a fourth frequency when the apparatus operates within an operational mode other than a low power oscillator bypass mode; and wherein: based on the operational mode and based on a comparison of the first frequency and the second frequency, the clock measurement and processing circuitry is operative selectively to process the first clock signal or the fourth clock signal using a first selected constant of a plurality of constants thereby generating the second clock signal; and a predetermined characteristic corresponding to based on the operational mode and based on a comparison of the first frequency and a predetermined characteristic corresponding to the third frequency, the clock measurement and processing circuitry is operative selectively to process the first clock signal or the fourth clock signal using a second selected constant of the plurality of constants thereby generating the third clock signal.