Timekeeping signal source for an electronic timepiece
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United States of America Patent
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Jan 24, 1984
Grant Date -
N/A
app pub date -
Jun 1, 1981
filing date -
Jun 6, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A timekeeping signal source for an electronic timepiece produces a highly accurate timekeeping signal which is stable in frequency with respect to both temperature variations and long-term drift. The timekeeping signal is produced by phase lock control using a high frequency reference signal from a crystal-controlled high-frequency oscillator. Phase lock control can be performed continuously or on an intermittent basis, in order to reduce power consumption. In addition, the timekeeping rate can be adjusted with a resolution within one period of the high frequency reference signal, by variation of a numeric value stored in digital memory means.
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