Patent ID: 8214670

Claim:
A semiconductor integrated circuit device comprising: an internal circuit that has a plurality of power supply regions in each of which operation power can be supplied or interrupted; and a power supply control circuit to control a supply of an operation power to the internal circuit or an interruption of the operation power to the internal circuit, wherein the power supply control circuit controls transition between the supply of the operation power to the internal circuit and the interruption of the operation power to the internal circuit according to first data and second data, the first data being to instruct a switching between the supply of the operation power and the interruption of the operation power, the second data being to determine a region of the interruption of the operation power, wherein the power supply control circuit begins to control the transition from the supply of the operation power to the interruption of the operation power according to the first data and second data, wherein before the transition from the supply of the operation power to the interruption of the operation power is completed, the first data and the second data are changed in accordance with a reset instruction or an interrupt request to the semiconductor integrated circuit device, wherein after the transition from the supply of the operation power to the interruption of the operation power is completed, the power supply control circuit changes regions of the interruption of the operation power according to the first data and the second data.