AVR-Chat

AVR-Chat@yahoogroups.com wrote:
> This kind of problem is already discussed in this group, but
> I could never finaly gather what might be a 'standard way' to
> wake up a dead AVR when osc fues bits are wrong programmed.
> Let's assume I have an AVR on my desk and do not know how osc
> fuesbits are programmed. Is the only way trying every
> possible configuration? This way doesn't seem a wise one to me.
> If I were AVR manufaturer, I would set up a seperate
> emergency osc. inside mcu to at least have access to fues
> bits to avoid such dead situations to happen.
> 

If it is dead because of wrong oscillator fuse settings, you just need
to put a 1MHz clock signal into the XTAL1 pin, then set the fuse bits
for internal 1MHz oscillator (the factory default). Then you will be
able to remove the clock and program it ok.

-- 
Tim Mitchell
tim@sabretechnology.co.uk
http://www.sabretechnology.co.uk