Patent ID: 7847610

Claim:
A semiconductor device which is driven by a power supply voltage which is supplied from outside, comprising: an internal circuit which is driven by the power supply voltage and is set in one of a first state and a second state in which an amount of current consumed by the internal circuit is greater than in the first state; and a wait control module configured to detect that a state of the internal circuit has transitioned from the first state to the second state, and to execute a wait control process of outputting an operation start instruction signal to the internal circuit after passing of a predetermined wait time from the detection of the transition of the state of the internal circuit from the first start to the second state, thereby to cause the internal circuit to wait for a start of an operation which is to be executed in the second state, until a variation of the power supply voltage, which occurs at a time of the transition from the first state to the second state, is suppressed.