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RTC Fujitsu Micrcontroller

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naina30

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Hi,

I am using fujitsu microcontroller for automotive cluster.and I am facing a weird problem ,the RTC when ignition is off ,and on doing ignition on after almost say 12 hours is more than 4 secs ahead of actual time set.
In ignition off state the RTC is working on sub clock 32.768 Khz as well the microcontroller also is working on the same sub clock.
In Ignition On state the RTC still remains on 32.768 Khz clock ,but microcontroller is on Main clock(8Mhz).


Also I would like to know has anyone used 32kHz CLOCK CALIBRATION UNIT,how exactly it has to be used its not very clear from hardware ref manual.

Thanks
 

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