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Integrated circuit having clock trim circuitry

  • US 20060052962A1
  • Filed: 08/29/2005
  • Published: 03/09/2006
  • Est. Priority Date: 12/02/2002
  • Status: Active Grant
First Claim
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1. An integrated circuit comprising:

  • a processor;

    an onboard system clock having a ring oscillator for generating a clock signal;

    a memory; and

    clock trim circuitry, wherein the processor is arranged to;

    in response to receiving an external signal, determine 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 and to output the determined number of cycles to an external circuit; and

    in response to receiving a trim value based on the determined number of cycles from the external circuit, store the trim value in the memory and control the clock trim circuitry to trim the frequency of the clock signal generated by the ring oscillator using the trim value.

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