Microcomputer system with reduced power consumption

Details Microcomputer system with reduced power consumption Microcomputer system with reduced power consumption

2008-10-07

2011-10-25

Auve, Glenn A (Department: 2111)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S320000, C713S324000, C713S600000, C713S601000

Reexamination Certificate

active

08046615

ABSTRACT:
A sub-microcomputer having a sub-CPU and a power supply control section that controls the power supply to a main microcomputer is disposed in addition to the main microcomputer having a main CPU. A sub-clock section that supplies a sub-clock signal having a lower frequency to the sub-microcomputer can change over between a continuous mode and an intermittent mode. When the main CPU gives an operation stop notification to the sub-CPU, the sub-CPU recognizes the notification, stops the power supply to the main microcomputer, and sets the sub-clock section to the intermittent mode. The sub-CPU determines that the operation state condition is satisfied in the period of the intermittent mode, the sub-CPU changes over the sub-clock section to the continuous mode to restart the power supply to the main microcomputer.

REFERENCES:
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patent: 6353351 (2002-03-01), Aikawa
patent: 7243250 (2007-07-01), Ueda
patent: 7831847 (2010-11-01), Chen et al.
patent: 2006/0075267 (2006-04-01), Tokue
patent: 2010/0275048 (2010-10-01), Ishikura et al.
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patent: A-2006-164036 (2006-06-01), None
patent: A-2006-221381 (2006-08-01), None
Office Action mailed Oct. 13, 2009 in corresponding Japanese patent application No. 2008-145773 (and English translation).

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