| 摘要 |
In supplying power to a group of peripheral devices of a processor, a power supply control circuit supplies power only to a peripheral device that is being accessed by the processor, stops power supply to a peripheral device that is not being accessed by the processor, or supplies power only to a peripheral device designated by the processor in accordance with an operation mode of the processor. A power supply control circuit comprises a decoder circuit which selects a peripheral device that is being accessed by a processor, or a selector circuit which selects a peripheral device designated by the processor; power switches of each peripheral device which input a power supply selection signal of peripheral device to be power supplied; and a processor peripheral circuit. Thus, it is possible to optionally determine or select power supply to a group of peripheral devices of a processor and to realize reduction in electricity consumption by a peripheral device circuit of the processor by a simple circuit structure.
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