| 摘要 |
A mobile telecommunication device such as a mobile phone includes a high frequency, high accuracy clock oscillator 20 and a high resolution counter 22 for counting pulses from the main oscillator for controlling the timing of communication operations. A continuously running secondary low frequency clock oscillator 25 is provided for timing sleep intervals when the main oscillator is switched off for power saving purposes. Counters 27, 28 are provided for cyclically switching the main oscillator on and off periodically for time intervals determined by the secondary clock. Means 23, 24 is provided for loading the high resolution counter with a restart value at the commencement of the on phase of each cycle, the restart value being determined in accordance with the restart value in the previous cycle and the total time elapsed since the previous start. |
