Method and apparatus for real time clock frequency error correction
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 16, 2001
Grant Date -
N/A
app pub date -
Jun 18, 1999
filing date -
Jun 18, 1999
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A real time clock, suitable for use in mobile units in a radiocommunication system, is calibrated during production, and corrects for timing inaccuracies during normal operation. As a result, the accuracy of the real time clock's crystal oscillator is increased economically and efficiently. Frequency error correction is performed by periodically adjusting the frequency of the real time clock by a fixed amount once for every interval of time defined by an adjustment value. The adjustment value is determined by a calibration procedure performed during manufacture of the mobile unit.
First Claim
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