Method and apparatus for real time clock (RTC) brownout...

Details Method and apparatus for real time clock (RTC) brownout... Method and apparatus for real time clock (RTC) brownout...

2006-01-10

2006-01-10

Black, Thomas G. (Department: 3663)

Data processing: vehicles, navigation, and relative location

Navigation

Employing position determining equipment

C340S988000, C340S990000, C342S357490, C342S357490, C342S457000, C375S136000

Reexamination Certificate

active

06985811

ABSTRACT:
A method and apparatus for real time clock brownout detection. A low power real time clock (RTC) operates continuously to keep time in a global positioning system (GPS) receiver while some receiver components are powered down. In various embodiments, a brownout detector circuit detects a loss of RTC clock cycles. If a loss of RTC clock cycles exceeds a predetermined threshold such that the RTC is not reliable for GPS navigation, an RTC status signal so indicates.

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