Patent ID: 7609107
Filing Date: 2009-10-27
Classification: H03K

Abstract:
1. A semiconductor integrated circuit comprising: a circuit section whose activation and deactivation are controlled; a first voltage line to which one of a source voltage and reference voltage is applied; a second voltage line adapted to hold, dependently upon an added capacitance, a voltage which supplies power to the circuit section by a voltage difference as compared with the voltage applied to the first voltage line; a third voltage line to which the other of the source voltage and reference voltage is applied; a switch section connected between the second and third voltage lines; and a control section adapted to vary the voltage held by the second voltage line so that this voltage approaches the voltage applied to the first voltage line in the process of controlling the inactive circuit section to be activated, the control section further adapted to control the switch section to bring the second and third voltage lines from a disconnected to connected state, the control section still further adapted to initiate an initial setup of the circuit section during a period from when the held voltage begins to change to when the switch section is controlled.