Semiconductor integrated circuit and electronic information device

Abstract

The semiconductor integrated circuit according to the present invention includes a mode switching circuit for switching an operation mode of a main core circuit among a plurality of internal circuits between a normal operation mode and a stand-by mode; and a stand-by canceling circuit for instructing the mode switching circuit to cancel a stand-by mode, and the mode switching circuit and the stand-by canceling circuit are configured to operate in asynchronism with the system clock with stand-by voltage in the stand-by mode. Thus, the semiconductor integrated circuit is capable of achieving operations with reduced power consumption with restrained leakage current by further reducing power source voltage during a stand-by mode, while maintaining advantages of shortening a time required to return from the stand-by mode, and of requiring no additional circuitry, such as non-volatile memory, for returning from the stand-by mode and thus requiring no extra cost.