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Low current microcontroller circuit

  • US 7,729,205 B2
  • Filed: 03/03/2008
  • Issued: 06/01/2010
  • Est. Priority Date: 07/11/2002
  • Status: Expired due to Fees
First Claim
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1. A computer-implemented method performed by one or more processors for determining a duration of a first period beginning from a startup time in a system including a first oscillator of an unknown frequency and a second oscillator of a known frequency, the method comprising performing the following by operation of one or more processors:

  • generating a first count corresponding to a number of oscillations of the first oscillator during the first period;

    generating a second count corresponding to a number of oscillations of the first oscillator during a second period, the second period having a duration corresponding to a known number of oscillations of the second oscillator;

    converting the first count to an equivalent number of oscillations of the second oscillator during the first period;

    calculating the duration of the first period based on the converted number of oscillations of the second oscillator and the known frequency of the second oscillator; and

    calculating a system time since the startup time using the calculated duration of the first period.

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