Dual source real time clock synchronization system and method
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United States of America Patent
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Mar 11, 2008
Grant Date -
Jan 12, 2006
app pub date -
Jul 7, 2005
filing date -
Jul 7, 2004
priority date (Note) -
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Abstract
A dual source real time clock (RTC) synchronization system and method for implementation within automatic meter reading (AMR) systems that provide system-wide device time synchronization. In one embodiment, a microcontroller-implemented RTC counts elapsed seconds from a pre-determined system timestamp using a low-speed, low-accuracy crystal. A second source is used to compensate for the low-speed, low-accuracy crystal. This second source comprises a high speed clock in one embodiment. This dual source RTC system can synchronize the endpoint device.
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