Integrated circuit incorporating circuitry for determining which of at least two possible frequencies is present on an externally provided reference signal and method therefor

  • US 6,686,803 B1
  • Filed: 07/10/2001
  • Issued: 02/03/2004
  • Est. Priority Date: 07/10/2000
  • Status: Active Grant
First Claim
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1. An integrated circuit comprising:

  • a signal generation circuit responsive to an externally provided frequency reference signal having a frequency substantially equal to any of at least two possible reference frequencies, said signal generation circuit for generating an output signal related to the frequency reference signal; and

    a frequency detection circuit responsive to the externally provided frequency reference signal, for determining which of the at least two possible reference frequencies is present, and for generating a control signal accordingly.

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