Accuracy adjustment for time-of-day clock using a microcontrolle

Details Accuracy adjustment for time-of-day clock using a microcontrolle Accuracy adjustment for time-of-day clock using a microcontrolle

1989-09-05

1990-02-20

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

368200, G04C 1308, G04B 1712

Patent

active

049032518

ABSTRACT:
A microcontroller, software-based time-of-day clock compensates for inaccurate oscillator frequency by periodically correcting the time-of-day value using a calibration offset measured by manufacturing test equipment and permanently stored in nonvolatile memory. A high degree of time keeping accuracy is achieved without the use of trimming capacitors or presorted piezoelectric crystals in the oscillator. Furthermore, frequency error compensation is incorporated into the microcontroller system without requiring a significant amount of processing time overhead.

REFERENCES:
patent: 4282595 (1981-08-01), Lowdenslager et al.
patent: 4321698 (1982-03-01), Gomi et al.
patent: 4407589 (1983-10-01), Davidson et al.
patent: 4448543 (1984-05-01), Vail
patent: 4502790 (1985-03-01), Yokoyama
patent: 4513259 (1985-04-01), Frerking
patent: 4644484 (1987-02-01), Flynn et al.
patent: 4708491 (1987-11-01), Luitje

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