on reset --- RTC in 52235

Latha — Wed, 26 Aug 2009 04:24:09 GMT

Hi,

I am working on these issue from couple of days and i am not able to figure why it is happening so.

On reset all the RTC registers (seconds,minutes,hours days,alm ) are reseting to zero. In the manual it is given as the values will be arbitary .So I expected on reset the values would be same before the shutdown but it is reseting on each power on and also reset. Can some body explain about this .

my plan is to provide back up using battery for the RTC and make it to run continously to maintain real time .

I am also including the intailizatiopn code here.

MCF_CLOCK_RTCDR = ( (SYSTEM_CLOCK_KHZ * 1000 ) ) /* for configuring tjhe clock */

MCF_RTC_RTCCTL = (MCF_RTC_RTCCTL_EN ) ;

MCF_SCM_PPMRL &= (0xFFFFEFFF) ; /* enables the RTC*/

Please help me......i am stuck at this simple thing............

Thanks for your time

Re: on reset --- RTC in 52235

Xbot — Fri, 02 Oct 2009 12:14:53 GMT

Registers will get 0's during reset. why do you shutdown your micro if you want it real-time though? If you want to maintain value when its OFF, you should flash it in EEPROM.

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on reset --- RTC in 52235

Re: on reset --- RTC in 52235