Patent ID: 8742786

Claim:
A semiconductor device comprising: a monitor including a first element coupled between a first power supply line and a second power supply line, and a load for increasing a load value between the first element and the first power supply line or the second power supply line; a determination unit which determines an operating state of the first element based on an output of the monitor; and a switching circuit that selectively switches between a first supply of a clock signal to a first block so as to operate the first block and stop an operation of a second block and a second supply of the clock signal to the second block so as to operate the second block and stop an operation of the first block based on an output of the determination circuit, a second element coupled between the first power supply line and the second power supply line and including similar characteristics as the first element; and a circuit driven by the second element, wherein the determination unit determines whether the circuit is driven by the second element based on the operating state.