Integrated circuit and signal processing apparatus using the...

Details Integrated circuit and signal processing apparatus using the... Integrated circuit and signal processing apparatus using the...

2007-03-20

2010-02-16

Lee, Thomas (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

C713S310000, C713S320000, C713S330000, C713S340000, C700S297000

Reexamination Certificate

active

07664973

ABSTRACT:
An integrated circuit that operates with application of an external power source supplying a first source voltage, the circuit comprising: a source voltage monitoring unit that monitors the level of the first source voltage supplied from the external power source, and that determines whether the first source voltage is supplied from the external power source; a clock selecting unit that is supplied with a first clock of a first frequency and a second clock of a second frequency lower than the first frequency, and that selects and outputs the first clock when it is determined by the source voltage monitoring unit that the first source voltage is supplied and the second clock when it is determined by the source voltage monitoring unit that the first source voltage is not supplied; and a processor that operates with supply of either one of the first clock and the second clock output by the clock selecting unit and controls the operation of the integrated circuit.

REFERENCES:
patent: 5619707 (1997-04-01), Suboh
patent: 5991883 (1999-11-01), Atkinson
patent: 6178514 (2001-01-01), Wood
patent: 6338143 (2002-01-01), Shimazaki
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patent: 2003/0115494 (2003-06-01), Cervantes
patent: 2001-184146 (2001-07-01), None
Chinese International Patent Office, First Notification of Examination Remarks for Application No. 2007100857448, mail date May 16, 2008.

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