Re: Warning on migrating to ATMega8515 - eeprom problem

From: CBFalconer (cbfalconer_at_yahoo.com)
Date: 11/02/04 

Date: Tue, 02 Nov 2004 21:12:17 GMT

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. 

-- 
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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