AVR-Chat

On Jan 31, 2011, at 1:09 AM, Tim Mitchell wrote:

> ----Original Message----
> From: AVR-Chat@yahoogroups.com
> [mailto:AVR-Chat@yahoogroups.com] On Behalf Of Clark Martin
> Sent: 30 January 2011 22:49 To: AVR-Chat@yahoogroups.com
> Subject: Re: [AVR-Chat] ATMEGA64L, ATMEGA64
> 
> > I'd avoid doing it at all if possible. It might work
> > today, it might work tomorrow but it might not the next
> > day. Temperature is one variable that might affect it's
> > working, if it gets too hot or too cold it might stop
> > working. Also it might work, or at least seem to but you
> > might be getting errors that throw off the circuit's
> > operation without causing it to fail altogether. 
> > 
> 
> You may be right, but this was not my experience, and I hammered the devices in all sorts of conditions (not knowing about the 8Mhz limitation until I came across a couple that didn't work properly) - if they worked at all at 16Mhz then they were pretty solid. The 8MHz-only ones either would not start up, or locked up after running for a couple of seconds.
> 
It's always possible what you had were 16 or 20 MHz chips marked as 8MHz by Atmel.  It's a common practice, especially later in the production life when the yield on higher speed parts is up.
 
>  
> 

Clark Martin
Redwood City, CA, USA
Macintosh / Internet Consulting

"I'm a designated driver on the Information Super Highway"



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