AVR-Chat

John Samperi wrote:
> At 02:22 PM 5/04/2006, you wrote:
>> If you want to first check your CKOPT fuse (the default is UNCHECKED,
>> CHECK IT!!!!) that will fix a lot of problems.
> 
> The data sheet is VERY clear that the CKOPT fuse must be set ( i.e. 0)
> for clock speeds higher than 8 MHz.
> 
> I must say that I have never had any problems so far with it unchecked
> HOWEVER my crystal frequency has been 8MHz for all my boards up to now,
> no need for speed here :-) I think 8MHz is far too fast, in fact I have
> had one application (IDE Interface) where I had to introduce lots of nops
> to slow it down because the CDROM could not keep up with the AVR :-D
> 
> So all you "speedy gonzales" out there remember to check the CKOPT fuse
> if you MUST run above 8MHz....that reminds me to check it in my new
> Mega64 board which has a 16MHz crystal just for the heck of it
> (not in production yet) :-D
> 
> Regards
> 
> John Samperi

Try running a TCP/IP stack with 8Mhz lol, VERY SLOW. Even at 14.7456Mhz 
it is a bit slow, would love a 20Mhz part that had the features of the 
Mega128 then I could run at the 18.xxxMhz that gives me precise baud 
rates :)

-- 
Regards,

Kat.
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