Method and apparatus for calibration of a low frequency oscillator in a processor based system
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United States of America Patent
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Jul 31, 2007
Grant Date -
Dec 8, 2005
app pub date -
Jun 10, 2004
filing date -
Jun 4, 2004
priority date (Note) -
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Abstract
Method and apparatus for calibration of a low frequency oscillator in a processor based system. A method for calibrating an on-chip non-precision oscillator. An on-chip precision oscillator is provided having a known frequency of operation that is within an acceptable operating tolerance. The on-chip precision oscillator is used as a time base and then the period of the on-chip oscillator is measured as a function of the time base. The difference between the measured frequency of the on-chip non-precision oscillator and a desired operating frequency of the on-chip non-precision oscillator is then determined. After the difference is determined, the frequency of the on-chip non-precision oscillator is adjusted to minimize the determined difference.
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