AVR-Chat

----Original Message----

From: AVR-Chat@yahoogroups.com
[mailto:AVR-Chat@yahoogroups.com] On Behalf Of STEVEN Sent:
23 September 2009 13:44 To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Re: Mega128 apparently losing
programming 

> Tim,
> 
> Have you got anything else connected to the Isp Lines,
> some peripheral or other, i have had units with ATMega
> 16/168 where the eeprom has been "Erased" and the
> soloution was to free up these lines and or set the boot
> fuses so that code cannot be reprogrammed without erasing
> the device.     

No there isn't. The mega128 is a bit funny in that the MOSI/MISO ISP
lines use TXD1 and RXD1 pins rather than the SPI port pins as on most
other AVRs.

Also the fact that the fuses have been reprogrammed to the exact factory
defaults is a bit bizarre. I can't imagine how this would happen
accidentally.

-- 
Tim Mitchell

It obviously sounds like they were never programmed in the first place.
Maybe they slipped through. Is there any E^2 or RTC that was supposed to be
programmed too? Is that there?

Roland



2009/9/23 Tim Mitchell <tim@sabretechnology.co.uk>

>
>
> ----Original Message----
> From: AVR-Chat@yahoogroups.com <AVR-Chat%40yahoogroups.com>
> [mailto:AVR-Chat@yahoogroups.com <AVR-Chat%40yahoogroups.com>] On Behalf
> Of STEVEN Sent:
> 23 September 2009 13:44 To: AVR-Chat@yahoogroups.com<AVR-Chat%40yahoogroups.com>
> Subject: [AVR-Chat] Re: Mega128 apparently losing
> programming
>
> > Tim,
> >
> > Have you got anything else connected to the Isp Lines,
> > some peripheral or other, i have had units with ATMega
> > 16/168 where the eeprom has been "Erased" and the
> > soloution was to free up these lines and or set the boot
> > fuses so that code cannot be reprogrammed without erasing
> > the device.
>
> No there isn't. The mega128 is a bit funny in that the MOSI/MISO ISP
> lines use TXD1 and RXD1 pins rather than the SPI port pins as on most
> other AVRs.
>
> Also the fact that the fuses have been reprogrammed to the exact factory
> defaults is a bit bizarre. I can't imagine how this would happen
> accidentally.
>
> --
> Tim Mitchell
>
>  
>


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