| 摘要 |
A circuit system, capable of further reducing power consumption without degrading performance, has been disclosed and comprises a plurality of circuit units, a power supply for supplying a plurality of power supplies of different voltages, a plurality of power supply selection circuits provided in accordance with each of the plurality of circuit units and selecting a power supply to be supplied to each circuit unit out of the plurality of power supplies of different voltages, and a control circuit for controlling the plurality of power supply selection circuits to select a power supply to be supplied to each circuit unit in accordance with the respective operation states of the plurality of circuit units, wherein each circuit unit uses a power supply selected by the power supply selection circuit as an internal power supply.
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