Might sound glaringly obvious but could it possible be a watchdog timer 
reset ?

Other things I've noticed that cause suprious resets are lack of decoupling 
capacitors (I had big problems with this once).

It could also be that you are experiencing a stack overflow reset - make 
sure any calls/returns etc are matched and you're not jumping outside any 
loops.

Dom
----- Original Message ----- 
From: "Stephen D. Barnes" <stephendbarnes@cavtel.net>
To: "MIT PICList" <PICLIST@mit.edu>
Sent: Wednesday, August 13, 2008 1:37 PM
Subject: [PIC] How to determine cause of reset


> I'm using the dsPIC30F2010. Rolled my own RC servo routine for one
> servo. Every once in a while (approx 23 sec) the servo will twitch.
> Using ICD2 in debug mode, found the PIC is going to the reset vector. I
> have, I hope, examined the code in detail and found no reason that I can
> see for the behavior. Is there a non-volatile register that retains the
> micro's status/reason for reset? I have RTFM but do not seem to find, or
> have overlooked the answer to this. Any pointers are appreciated!
>
> -- 
> Regards,
> Stephen D. Barnes
>
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> 

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