Re: [avr-chat] 32768 Hz clock

[Royce Pereira]

Hi,
On Wed, 24 May 2006 10:15:44 +0530, Hugo González Monteverde <address@hidden> 
wrote:

>  > However, comparing to my wristwatch,  I find my clock falls behind about
>  > 1 minute every hour, so after 10 hrs, it's behind by 10 mins! My code
>  > above seems OK. Are there any hardware issues I need to address? Thanks
>  > for any help!
>
> This is realted to the capacitances you connect to the crystal.  I am
> not an expert at this, but check application notes for crystal
> considerations, such as the one from Dallas. They actually explain a bit:

Interesting, but this was not the cause of the problem. This happens to be an 
old thread. One of the members replied correctly- my ISR was too long, not 
finishing before the next interrupt came! The solution may be found in the avr 
chat archives:

http://lists.gnu.org/archive/html/avr-chat/2006-04/msg00050.html

Thanks to all who replied!

Regards,

Royce.


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