Re: microcontrollers for process control

On Tue, 11 Mar 2008 23:08:48 -0500, CBFalconer <cbfalconer@xxxxxxxxx>
wrote:

Ulf Samuelsson wrote:
"a_edwards" <eecoding@xxxxxxxxxxx> skrev:

... snip ...

yes that is good thanks. But i want a example of what is
currently used ny a manufacturer. If the system was for a large
building would not they use a 16 bit micro?

Yes, it is not well known but if the building has more than 8
levels, you *have* to use a 16 bit controller or better! If it
goes beyond 16 levels, you have to move up to a 32 bitter ;-)

If I hadn't been so lazy, I would have applied for a U.S. patent
for using a 32 bit MCU in a fire alarm if the building has more
than 16 levels.

Either that is utter nonsense or I am missing something. There is
no relation between interrupts available and 'levels'. There is a
relationship between code complexity and levels. And someone has
to decide how to break up the interrupts. But one would suffice,
combined with suitable i/o.

No, I think you'd definitely need a 32-bitter if there are more than
16 floors (including penthouse, basement and sub-basement levels).
They must use something like ganged 64-bit processors for Taipei 101.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@xxxxxxxxxxxx Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
.

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