>-----Original Message-----
>From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] 
>Sent: 10 August 2006 04:52
>To: Microcontroller discussion list - Public.
>Subject: Re: [AVR] ATMega128 EEPROM corruption
>
>
>>
>>
>> ....or not having BOD enabled, not having interrupts disabled while 
>> writing to the eeprom, not having the CKOPT enabled for frequencies 
>> above 8 MHz... oh you fell for that too David IIRC :)....
>
>
>Yes, and so have a LOT of people.
>FWIW, it dosent' matter what frequency you're running at 
>either. The vittoz mode osc output is only about 0.5VCC, and 
>unless the crystal is selected for very small cap values and 
>the whole ckt has been carefully designed, you'll have problems.

FWIW I didn't have the CKOPT bit selected on a whole bunch of engineering devices running with a 7.3728MHz resonator, and never experienced any issues that I could relate to the clock.  Better safe than sorry though.

Also I did experience numerous EEPROM corruption problems, which was down to my own ignorance.  I had selected a suitable brown out voltage in the configuration fuses, but hadn't actualy enabled the brown out reset!  Once done, all EEPROM issues were magicaly resolved.  I also have location 0 as a sacrificial lamb, if you can spare the one location I think it's a worthwhile precaution.

Regards

Mike

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