GOT YOU, WRONG!
One NOP instruction execution time in a 4mhz crystal 16C84 can have
several answers, but the most correct one is: *undetermined*, mostly
because "mhz" is not a valid frequency definition.  Suppose Mike (note
the use of upper case - capital letter at his name) tried to say 4mHz,
so it would represent four milliHertz, then the NOP instruction would
take as much as 1000 seconds, or 16 minutes and 40 seconds.  But suppose
Mike tried to say 4MHz, then it will be 1 microsecond.  By the other
side, if mike tried to tricky all of you saying really "4mhz", the
answer is: *undetermined* because 4mhz is not a valid frequency, so,
there is not a possible valid answer.

Wagner.


"Thomas C. Sefranek" wrote:
>
> Mike M wrote:
>
> > how long does it take for One instruction like "NOP" to execute useing a 4mh
z crystal on a 16c84?
> >
> > Send someone a cool Dynamitemail flashcard greeting!! And get rewarded.
> > GO AHEAD! http://cards.dynamitemail.com/index.php3?rid=fc-41
>
> Is this a trick question?
>
> 1 microsecond.
>
> --
> Thomas C. Sefranek  WA1RHP
> ARRL Instructor, Technical Specialist, VE Contact.
> http://www.harvardrepeater.org
> http://hamradio.cmcorp.com/inventory/Inventory.html