Patent ID: 7236810

Claim:
A method for use in reestablishing a timing signal in a high frequency timing circuit after the high frequency timing circuit has lost power, the method comprising: (a) measuring the timing of a low frequency timing circuit against the timing of the high frequency timing circuit before the high frequency timing circuit has lost power, (b) using the low frequency timing circuit to measure time after the high frequency timing circuit has lost power, and (c) based on a time measurement obtained from the low frequency timing circuit, re-establishing the timing signal at an appropriate time after the high frequency timing circuit has regained power, wherein the re-establishing the timing signal includes: first using the low frequency timing circuit to reapply power to a high frequency oscillator that drives the high frequency timing circuit, and then using the low frequency timing circuit and a signal from the high frequency oscillator to generate a synchronization pulse that aligns the high frequency timing circuit.