CPU peripheral devices for clock generation circuit and the CPU peripheral devices for clock generation method

摘要

PROBLEM TO BE SOLVED: To provide a clock generating circuit and a clock generating method for a CPU peripheral device that are capable of creating the clocks and control signals best suited for writing or reading data from a CPU to the peripheral device in synchronism with control signals output from the CPU, irrespective of changes in processes, source voltages and the like.;SOLUTION: The clock generating circuit comprises a clock delaying circuit that produces a plurality of delayed clocks in accordance with the clocks supplied to the CPU; a selective computing circuit that performs computations to determine which of the plurality of delayed clocks is to be selected on the basis of the leading or trailing edge of a write enable signal outputted from the CPU; a clock selecting circuit for selecting two or more of the plurality of delayed clocks on the basis of the output result of the selective computing circuit; and a clock computing circuit that performs computations on the two or more clocks selected. The clocks and the write enable signal output from the clock computing circuit are used respectively as operating clocks and a write enable signal for the CPU peripheral device.;COPYRIGHT: (C)2006,JPO&NCIPI