Patent ID: 7814343

Claim:
A semiconductor integrated circuit comprising: a first processor to be operated at a first operating frequency; a second processor having a leakage current that is less than that of the first processor and which is operated at a second operating frequency that is lower than the first operating frequency; a selecting portion capable of selectively switching an executing destination of a software application into the first processor or the second processor according to a demanded operating speed of the software application, a first switch controlling supply of an operating voltage to the first processor; a first regulating circuit; and a second regulating circuit whose voltage response performance is higher than a voltage response performance of the first regulating circuit, wherein the first processor and the second processor can execute an identical instruction set, respectively, wherein a first voltage is supplied to the first regulating circuit and the second regulating circuit, wherein the first regulating circuit converts from the first voltage to a second voltage, wherein the second regulating circuit converts from the first voltage to a third voltage, wherein when the first switch is in an ON state, the selecting portion selects the second regulating circuit and the second regulating circuit supplies the third voltage to the second processor and the selecting portion, and wherein when the first switch is in an OFF state, the selecting portion selects the first regulating circuit and the first regulating circuit supplies the second voltage to the second processor and the selecting portion.