Method for digital frequency trimming an oscillator in an electronic timepiece
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 4, 1981
Grant Date -
N/A
app pub date -
Dec 21, 1979
filing date -
Dec 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for adjusting the frequency of piezoelectric crystal oscillator. The effective frequency of the oscillator is adjusted (trimmed) by periodically inhibiting pulses to the divider stage. The pulse inhibit circuit includes a nonvolatile programmable read-only-memory (ROM) to store binary complement information corresponding to the number of oscillator pulses to be suppressed. A counter is periodically preset with the binary complement information and the count advances in response to oscillator pulses. The difference count between the complement number and the counter's maximum count controls the number of pulses periodically suppressed. During manufacture/assembly of the timepiece, the ROM is programmed to contain the desired complement information.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully