Re: Warning on migrating to ATMega8515 - eeprom problem

From: Mike Harrison (mike_at_whitewing.co.uk)
Date: 11/03/04 

Date: Wed, 03 Nov 2004 09:17:23 GMT

On Tue, 02 Nov 2004 21:12:17 GMT, CBFalconer <cbfalconer@yahoo.com> wrote:

>Ulf Samuelsson wrote:
>>
>>> 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.
>>
>> Yes, probably a bug, but it is questionable if it is serious.
>> I.E worth doing a new maskset to fix this bug.
>>
>> The bug only affect those that step up from the 4414, and
>> those that assume that registers have a known value at reset.
>>
>> It is generally a good practice to avoid relying on reset values.
>>
>> It is an unknown harmless condition on reset and takes two
>> instructions to fix after reset. The problem is if you do not
>> know about it.
>
>I consider it a bad bug. You can't have code that runs on both
>machines, it will either have illegal instructions, or fail to
>initialize.

I don't think there would be any problem writing non-existant registers on the 4144 - it's not an
'illegal instruction'

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