Apparatus and method for reducing power consumption by peripheral devices after downloading a program therefrom

摘要

A microcomputer system of the present invention, includes for reducing power consumption therein, an internal memory device in a processor device and a buffer, the buffer further including therein disconnection means for connection and disconnection with and from an external bus and power consumption reduction means for reducing power consumption in peripheral device. Hereby, a program that is executable only within the processor device is stored in the internal memory device, and the peripheral devices are brought into a low power consumption mode and the external bus is made disconnectable upon execution of the program.