Clock trim mechanism for onboard system clock
AssigneeSilverbrook Research Pty Ltd
InventorsGary Shipton, Simon Robert Walmsley
Life of this patent
Estimating the term…
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.
Claims16
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) output the result of the determination of step (b) to an external source;
- (d) receive a trim value from the external source;
- (e) store the trim value in the integrated circuit, the trim value having been determined on the basis of the determined number of cycles;
- (f) use the trim value to control the internal clock frequency.
Dependencies are inferred from the claim text.