> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On
Behalf
> Of Olin Lathrop
> Sent: 23 February 2011 19:24
> To: Microcontroller discussion list - Public.
> Subject: Re: [EE] packaging of 32bit CPUs...
>=20
> Michael Rigby-Jones wrote:
> >> 32-bit may provide for quicker development if you want to write in
C
> >> (and there's talk of C++ at Microchip) but at the most basic level
> >> the ALU of a 32 bit chip is always going to be switching more gates
> >> than one with fewer bits, thus using more energy per cycle, if you
> >> care about battery life.
> >
> > But a calculation can likely be completed in fewer cycles,
especially
> > if it involves values larger than 8 bits, and multiple bit shifts
etc.
>=20
> That may be true for some cases, but not most I think. =20

My view may be a bit skewed as the products I work with tend to have a
lot of 16 bit ADCs and DACs, so you end up with a lot of 32 bit math.  I
still use PIC's for the odd project, mostly stuff I do in my own time
though.

Even something as simple as shifting a 32 bit value by multiple bits on
a PIC is agonisingly slow compared to e.g. an ARM cored device where
it's a single instruction.

Mike

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