Patent ID: 7149555

Claim:
A mobile phone having at least one main clock system and operating based on a main clock signal of said main clock system, wherein said main clock system comprising: a main counter configured to count main clocks of said main clock signal; and a power saving circuit configured to stop generation of said main clock signal for a time period, while counting wait clocks of a wait clock signal, to restart the generation of said main clock signal after the time period, and to control said main counter based on the counted wait clocks as if said main counter always counts said main clocks of said main clock signal, wherein said power saving circuit comprises: a correction controller configured to count said wait clocks of said wait clock signal for the time period during which the generation of said main clock signal is stopped, and to correct a count value of said main counter based on the counted wait clocks, said correction controller comprises: a single counter configured to count said wait clocks of said wait clock signal for the time period during which the generation of said main clock signal is stopped; and a calculator configured to calculate said main clocks while the generation of said main clock signal is stopped; and a setting circuit configured to correct the count value of said main counter based on the calculated main clocks.