Resuming piecewise calibration of a real-time-clock unit after a measured offset that begins at the next calibration period
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United States of America Patent
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Apr 29, 2014
Grant Date -
Aug 25, 2011
app pub date -
Feb 15, 2011
filing date -
Feb 24, 2010
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Abstract
A method of calibrating a module whose operation is dependent upon a module clock signal, the method comprising: over each calibration period of a plurality of such periods, obtaining a measure of the frequency of an observed signal, the observed signal being the module clock signal or a clock signal generated based upon the module clock signal; influencing operation of the module in dependence upon the obtained measures so as to calibrate the module; and for each said calibration period, taking account of a position in time of the end of that calibration period relative to a particular feature of the observed signal and delaying the start of the following calibration period relative to a subsequent said particular feature of the observed signal in dependence upon that position.
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