Semiconductor device and portable terminal equipment

摘要

A semiconductor device (1) is provided that is functionally divided into blocks. The power supply systems of the blocks are divided into a non-controlled power supply group (2) in which power is always on and controlled power supply groups (31 to 3n) in each of which groups a supply of power can be turned on/off independently. When a power supply system control part (5) of the non-controlled power supply group (2) outputs a control signal for power on, a power switch part (81) turns on to release the controlled power supply group (31) from the sleep mode, so that the first processing part (61) starts intermittent operation. Only when it is determined that a first next-processing necessity determining part (71) determines necessity of the next processing, a control signal is generated to activate the next power supply group. The blocks unnecessary for processing are not supplied with power, so that no leakage current flows and power consumption because thereof can be reduced. Such a semiconductor device is directed to making unnecessary circuit operation inactive to reduce power consumption because of leakage current.