Patent ID: 7535790

Claim:
A semiconductor device, comprising a plurality of functional blocks and a select signal generation circuit for supplying a select signal to a functional block to be operated out of said plurality of functional blocks, characterized in that each of said plurality of functional blocks comprises: a clock generation unit to which said select signal and a system clock are supplied, and which generates a control clock based on said system clock when said select signal is being supplied, and stops generation of said control clock when said select signal is not being supplied; and a dynamic circuit including a p-type transistor of which gate is supplied with said control clock and an n-type transistor of which gate is supplied with an input signal, which are provided in series between a power supply and a ground, wherein a node between said p-type transistor and said n-type transistor is precharged responding to the supply of said control clock and discharged responding to said input signal.