Patent ID: 7542445

Claim:
A mobile radio terminal, comprising: a system clock having a controller, a frequency generator for outputting a clock signal and a temperature sensor for detecting an operating temperature of the frequency generator, wherein the controller adjusts a frequency of the clock signal by inputting a frequency generator control value associated with the detected operating temperature to the frequency generator; a control circuit that manages overall operation of the mobile radio terminal, the control circuit configured to place the mobile radio in one of plural operational modes and the clock signal is used to clock an electrical component activated in connection with the one of the operational modes; and a look-up table that stores frequency generator control values for plural operating temperatures; and wherein the controller updates the look-up table in conjunction with a synchronization of the system clock with a reference signal from a communications network, the updating including changing a stored frequency generator control value for the operating temperature of the frequency generator at the time of synchronization to a control value applied to the frequency generator to establish synchronization of the system clock.