PURPOSE: To provide an integrated circuit power consumption device capable of reducing power consumption without being affected by a program executed in a processor even in the short time of a mechanical language execution level in an integrated circuit microprocessor.

CONSTITUTION: When it is judged that an instruction executing device 14 is in a stand-by state in a stand-by state judging device 10 based on a request signal S102 for requesting a cooperative processing from the instruction executing device 14 to a bus interface device 11 and an acknowledge signal S101 indicating the propriety of accepting the cooperative processing from the bus interface device 11 to the instruction executing device 14, a clock supplying device 12 stops supplying a clock to the instruction executing device 14 by an instruction signal S114 or permits the clock to be a low-speed one.