ATmega128/2556: Reset behavior

Hi there, hopefully someone knows:

On a system using external RAM, what happens when the reset pin drops ? Is a running write-access to external RAM abborted asynchronously ( = immediately ), or, is such a bus cycle completed before ?

And, what happens to all other I/O pins/ports in this case ? Are they driven high immediately (=asynchronously), or, are they driven high as soon as a bus cycle has completed ?

Thanks in advance, Norbert

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Norbert Wolf
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