Oscillators – Plural oscillators
Reexamination Certificate
2010-01-27
2011-11-08
Pascal, Robert (Department: 2817)
Oscillators
Plural oscillators
C331S049000, C331S055000, C331S158000, C331S160000, C331S185000
Reexamination Certificate
active
08054138
ABSTRACT:
This invention makes it possible to reduce a power consumption of an electronic circuit (microcomputer, for example) while preventing malfunctioning of an oscillator by appropriately setting a power supply impedance of a low frequency oscillator corresponding to an operation mode. A high frequency oscillator, a medium frequency oscillator and a low frequency oscillator are provided as sources of system clocks. In addition, there is provided a quartz oscillator to generate a clock for a timepiece. When the high frequency oscillator is in operation, a power supply impedance of the quartz oscillator is reduced to improve a noise tolerance. In a waiting period during which the high frequency oscillator, the medium frequency oscillator and the low frequency oscillator are halted, on the other hand, the power supply impedance of the quartz oscillator is increased to suppress the power consumption.
REFERENCES:
patent: 5325074 (1994-06-01), Suenaga
patent: 5705955 (1998-01-01), Freeburg et al.
patent: 7342465 (2008-03-01), Seefeldt
patent: 7414490 (2008-08-01), Jeon et al.
patent: 9-34867 (1997-02-01), None
patent: 2002-222024 (2002-08-01), None
Gannon Levi
Morrison & Foerster / LLP
Pascal Robert
Semiconductor Components Industries LLC
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