AVR-Chat

Dave VanHorn wrote:

>>   Were you attempting to use this non rail-to-rail clock for external devices?
>>    
>>
>Absolutely not.
>
>  
>
>>   As I undersand that data sheets on this issue, the low power(non rail-to-rail) clock option is only recommended when you are NOT sharing the clock with any other device.
>>    
>>
>I've confirmed with Atmel that it's a Vittoz type oscillator.
>Pull a google on it.  Nice way to save power, but your crystal 
>selection is much more critical. Notice that Atmel gives you no 
>guidance on what the amplitude should be, or really even that there's 
>much 'special' about this mode at all?
>
>This issue forced us into a total recall of a bunch of systems. 
>The problems were glitchy, hard to pin down, and blamed on software 
>and hardware, up until a new date code of AVR chips arrived, and at 
>that point, some fairly large number of them wouldn't start, using 
>the same crystal and caps as we had before.
>  
>
  Ahhh.  OK, then.   Well, I suppose even Atmel makes mistakes 
sometimes, eh?  *sigh*

Tom