Re: Warning on migrating to ATMega8515 - eeprom problem
From: CBFalconer (cbfalconer_at_yahoo.com)
Date: 11/02/04
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Date: Tue, 02 Nov 2004 03:29:08 GMT
Ulf Samuelsson wrote:
> "Mike Harrison" <mike@whitewing.co.uk> skrev i meddelandet
>
... snip ...
>>
>> The problem actually 'occurred' a few years ago when we were
>> forced to migrate from the 4414 to the 90S8515 when the 4414 was
>> obsolete, then only manifested itself when we again were forced
>> to change to a new part due to the 8515 going obsolete.
>>
>> Most of us are too busy developing new products to spend a lot of
>> time re-examining code written years ago that breaks when put on
>> a new, supposedly 'compatible' part.....
>
> I think this email went a bit premature. I meant to say:
> You need to read more carefully to see that most registers ARE in
> fact initialized even on the ATmegaAVR.
>
> I dont think it is reasonable to expect to see that the EEAR is not
> initialized and I think it *should* be in the migration document.
I have been idly following this thread, and as far as I am
concernced that new device has a serious bug. It obviously cannot
run code developed for earlier products without changes, so cannot
be used as a replacement. It would have taken little effort to set
that register in a known harmless condition on reset.
-- Chuck F (cbfalconer@yahoo.com) (cbfalconer@worldnet.att.net) Available for consulting/temporary embedded and systems. <http://cbfalconer.home.att.net> USE worldnet address!
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