METHOD FOR OPERATING PROCESSOR OF TYPE INCLUDING BUS UNIT AND EXECUTING UNIT, CENTRAL PROCESSING UNIT, COMPUTER SYSTEM AND CLOCK CONTROL DEVICE CIRCUIT

摘要

PURPOSE: To provide the clock controller circuit saving power of a high performance microprocessor. CONSTITUTION: In this invention, when an execution unit 12 or an ALU cannot use data, two logic gates and one flip-flop are used to disable a clock signal to the execution unit 12 or the ALU. When a memory device, an I/O or an internal cache cannot provide data or an instruction to the execution unit 12, a sleep mode or a clock idle mode is provided to the execution unit 12. A clock controller circuit 26 gates the clock signal to a logical high level to disable the clock signal The clock controller circuit 26 stops the clock signal in response to a data use disable signal from a bus unit and a data request generating signal from the execution unit 12.