| 摘要 |
PROBLEM TO BE SOLVED: To reduce power consumption of a semiconductor integrated circuit adopting a multi-threshold voltage CMOS technology in a power saving mode. SOLUTION: A first switch interrupts connection of a virtual power line to a normal power line in response to activation of a switch control signal at the time of switching from a normal operation mode to a power saving mode. To a first circuit block connected with the virtual power line, supply of power supply voltage is stopped in the power saving mode. A second switch of a floating prevention circuit connects a connection node between the output of the first circuit block and the input of a second circuit block with a first voltage line on receiving inactivation of the switch control signal in the power saving mode. Thus, the input of the second circuit block is prevented from floating even when the power supply voltage is not supplied to the first circuit block. Consequently, flow of through current in the second circuit block is prevented and increase of the power consumption is prevented in the power saving mode. COPYRIGHT: (C)2004,JPO&NCIPI
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