PURPOSE: To reduce the electromagnetic radiation noise radiated from a higher harmonic, and to prevent the malfunction of a peripheral electronic apparatus by driving an electronic circuit for supplying and driving a clock signal by a clock signal containing plural pulse signals.

CONSTITUTION: In the driving method of an electronic circuit driven by supplying a clock signal, the electronic circuit is driven by using a signal constituted of a pulse signal having at least two or more duty ratios or constituted of a pulse signal having at least two or more different frequencies as clock signal. In such a way, a higher harmonic component of the clock signal is dispersed, intensity of each higher harmonic, and accordingly, an electromagnetic radiation noise can be reduced, and a malfunction of a periphery electronic apparatus can be prevented.