Reference clock signal generation circuit, power supply...

Details Reference clock signal generation circuit, power supply... Reference clock signal generation circuit, power supply...

2006-05-18

2009-10-13

Lewis, David L (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S211000, C345S212000, C345S213000, C327S115000, C327S116000, C327S119000, C327S148000, C327S152000, C327S291000

Reexamination Certificate

active

07602386

ABSTRACT:
A reference clock signal generation circuit for generating a reference clock signal for a charge-pump operation which raises or lowers a voltage includes a clock signal generation circuit which generates a reference clock signal having one of first to nth (n is an integer of two or more) frequencies, a wait time setting register in which a value corresponding to a wait time is set, and a frequency setting register in which a value corresponding to one of the first to nth frequencies is set. The clock signal generation circuit generates the reference clock signal having a predetermined frequency in a start period from start of the charge-pump operation to completion of the wait time, and generates the reference clock signal having a frequency corresponding to the value set in the frequency setting register in an operation period after the start period.

REFERENCES:
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patent: 6259293 (2001-07-01), Hayase et al.
patent: 6727681 (2004-04-01), Morita
patent: 2002/0167510 (2002-11-01), Matsumoto
patent: 2003/0204766 (2003-10-01), Akasaka et al.
patent: 2005/0127962 (2005-06-01), Furuya
patent: A-2003-102165 (2003-04-01), None

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