[En-Nut-Discussion] ATmega2561 Fuses

[jakub nowak]

In my opinion there are at least two possibilities:
1)You blocked processor:
      a)You lock fuses( :-( You have to buy nee uP)
     b)You change cristal fuses to wrong value(read Datasheet what's now)
2)You have to long cable that connect board with programmer(check that it
has only buffer or it has also filters - on SCK is most needed). With small
program with good luck you will program uP, but If You will need about 70%
and more memory noises don't give You chance.

Some other reason is also possible, this above are most common.

2008/5/12 Dusan Ferbas <dferbas at etech.cz>:

> Hi guys,
>
> those, who tested 2561 chips - Did you notice something similar to
> following when working with this chip ?
>
> ---
> I was able to flash basemon code once. It worked. I was able to flash
> another basemon (different version) 2nd time.
> An attempt to flash the first version (3rd time) failed.
>
> Chip now returns all 1s (0xFF) to ISP programmer.
> We have no possibility to further program the chip, neither to
> change, even to read fuses.
>
> P.S. When we replace 2561 with ATmega128, change chip type in AVR
> Studio, ISP works.
>
>
> Dusan
>
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