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1. 发明公开

EP2333954A1 Clock recovery in a battery powered device 有权转让
标题翻译： Taktrückgewinnung在einer batteriebetriebenen Vorrichtung
公开(公告)号：EP2333954A1
公开(公告)日：2011-06-15
申请号：EP10161688.6
申请日：2010-04-30
申请人： ST-Ericsson SA
发明人： Ellis, Andrew
IPC分类号： H03K5/00 , H03L7/00
CPC分类号： H03K5/00 , G06F1/14 , G06F1/30
摘要： A battery powered device is able to maintain a clock value when the battery is removed for a short period. During a first time period, while the battery is in the device, clock pulses derived from a first oscillator are counted at a first rate in a first counter that represents the clock value. During a second time period following the first time period, while the battery is removed, the value of the first counter is maintained independent of any clock pulses derived from the first oscillator, clock pulses derived from a second low power oscillator are counted in a second counter. During a recovery time period following the second time period, clock pulses derived from the second oscillator are again counted in the second counter, while clock pulses derived from the first oscillator are counted in the first counter at a second rate higher than the first rate, the duration of the recovery time period being determined based on the number of pulses counted in the second counter during the second time period.
摘要翻译：电池供电的设备能够在短时间内移除电池时保持时钟值。在第一时间段期间，当电池处于器件中时，从表示时钟值的第一计数器中以第一速率对来自第一振荡器的时钟脉冲进行计数。在第一时间段之后的第二时间段期间，当电池被移除时，第一计数器的值被保持为独立于从第一振荡器导出的任何时钟脉冲，来自第二低功率振荡器的时钟脉冲被计数在第二时间计数器。在第二时间段之后的恢复时间段期间，从第二振荡器导出的时钟脉冲在第二计数器中再次被计数，而从第一振荡器导出的时钟脉冲以比第一速率高的第二速率在第一计数器中计数，基于在第二时间段期间在第二计数器中计数的脉冲数来确定恢复时间段的持续时间。

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