Dual source real time clock synchronization system and method
US7343255B2 · kind B2 · utility
11Cited by
29References
21Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 7, 2005 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Jul 7, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C2201/51
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.