Clock trim mechanism for onboard system clock

Data processing: measuring – calibrating – or testing – Calibration or correction system – Signal frequency or phase correction

Reexamination Certificate

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Details

C331S00100A, C331S044000, C331S17700V, C327S044000, C327S047000, C327S141000, C327S162000

Reexamination Certificate

active

07096137

ABSTRACT:
An integrated circuit, comprising a processor, an onboard system clock for generating a clock signal, and clock trim circuitry, the integrated circuit being configured to: (a) receive an external signal; (b) determine either the number of cycles of the clock signal during a predetermined number of cycles of the external signal, or the number of cycles of the external signal during a predetermined number of cycles of the clock signal; (c) store a trim value in the integrated circuit, the trim value having been determined on the basis of the determined number of cycles; and (d) use the trim value to control the internal clock frequency.

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