AVR-Chat

Someone already mentioned what might be wrong.  You may have
inadvertently switched oscillator sources by programming the fuse
bits.  I know ponyprog (last time I used it) would invert the fuse bits.

The other person also already mentioned the solution to the wrong
oscillator issue...but I figured I'd get a little more specific (I had
the exact same problem).  

If connecting an xtal (as would be normal for an externally clocked
MCU) to the clock pins doesn't fix it, you can setup another
externally clocked MCU and feed the output clock pin from the working
MCU to he input clock pin of the non-working one.  Yes, you'll need to
do that while the non-functional chip is also connected to the programmer.

Failing that, ummm, I suppose you could wire up the output of a 555
timer to the clock input pin.  It just has to be a higher frequency
than the I/O on the programmer.


--- In AVR-Chat@yahoogroups.com, "mooodij" <mooodij@...> wrote:
>
> hi.
> I have some problem with my printer port(I think so).
> becouse when I programed my AVR chip for the second time i couldent 
> program it again.
> (in the condition that i wase made no chenges in my softwar & hardwar.)
> the error seys that byte0=FFh byte1=FFh byte2=FFh  and it must be ... .
> afte I installed the new windows I could program my chip just for 1 
> more time & the error came back.
> & now i dont know what to do.
>