Re: AVRISP

From: Chris Alexander (info_at_bostonsemiconductor.com)
Date: 10/10/04 

Date: 10 Oct 2004 06:47:14 -0700

Hi - I had exactly this problem with a Mega8.

The suggestion that you accidentally ticked the external oscillator
fuse was, in fact, what the problem was (for me). I was able to take
a 2 mhz TTL oscillator "can" and wire it to XTAL1 and reprogram the
fuses. I have not had any problems since - but now I set the fuses
only once to my desired settings *and never program them again*. Now
I only update Flash in the programming window.

This is a very common accident - I found help very quickly over the
weekend at the AVR Freaks forums. Take a look at
http://www.avrfreaks.net/

Cheers,
Chris

"Hopkins" <rdhopkins@ihug.co.nz> wrote in message news:<ck6nit$oma$1@lust.ihug.co.nz>...
> I have the AVRISP and when programming the ATMega 8 chip I have 2 chips out
> of four that have locked up when been reprogrammed to the point the AVRISP
> programmer complains it can not enter programming mode.
>
> I asked ATMEL about the problem and they just said that I must have the
> wrong fuse bits set!
>
> IMHO why the hell should a product produced by a comercial company have a
> bug that allows you to corrupt the chip you are programming to the point
> that you can not even reset the fuse bits anymore.
>
> Have read that this situation can be rescued with a parrallel programmaer,
> is there a way I can rig somthing up to reset the fuse bits other than
> buying another programmer?
>
> Thanks in advance Roy.

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