mega103 compatibilty

Hi all,

I have just began a new design around mega64 (AVR Atmel) and i spent a
long day on a strange mega64 behaviour because it was shipped with mega103
compatibilty mode enable in Extended fuse bits. Is that always true ?
After that pb resolved, i found another strange thing, mega64 always
programmed very well (uisp or sp12 dongles) even PEN is left unconnected.

Are there another important thing to do with mega64 or 128 ?
Have you some advice about ?

Habib

habib bouaziz-viallet wrote:

> Hi all,
> 
> I have just began a new design around mega64 (AVR Atmel) and i spent a
> long day on a strange mega64 behaviour because it was shipped with mega103
> compatibilty mode enable in Extended fuse bits. Is that always true ?
> After that pb resolved, i found another strange thing, mega64 always
> programmed very well (uisp or sp12 dongles) even PEN is left unconnected.
> 
> Are there another important thing to do with mega64 or 128 ?
> Have you some advice about ?
Yes, this is always true. Also for the 128. Another thing to think of is the
JTAG Enable. Did cost me some hours... Table 118/119 in pdf-descriptions of
the 128 tells you all this, but if you don't come to page 285 of the file -
well, I don't want to remember.

Michael 

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Le Fri, 11 Feb 2005 14:45:21 +0100, Michael Schuster a �crit�:

> habib bouaziz-viallet wrote:
> 
>> Hi all,
>> 
>> I have just began a new design around mega64 (AVR Atmel) and i spent a
>> long day on a strange mega64 behaviour because it was shipped with mega103
>> compatibilty mode enable in Extended fuse bits. Is that always true ?
>> After that pb resolved, i found another strange thing, mega64 always
>> programmed very well (uisp or sp12 dongles) even PEN is left unconnected.
>> 
>> Are there another important thing to do with mega64 or 128 ?
>> Have you some advice about ?
> Yes, this is always true. Also for the 128. Another thing to think of is the
> JTAG Enable. Did cost me some hours... Table 118/119 in pdf-descriptions of
> the 128 tells you all this, but if you don't come to page 285 of the file -
> well, I don't want to remember.
> 
> Michael

Many Thanks Michael

Habib