Re: Wich 16-bit MCU?


"Robert Latest" <boblatest@xxxxxxxxx> wrote in message
news:4ghurfF1nn3obU1@xxxxxxxxxxxxxxxxx
On Thu, 29 Jun 2006 11:23:01 +0100,
Tom Lucas <news@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote
in Msg. <1151576507.6051.0@xxxxxxxxxxxxxxxxxx>

I reckon an ARM7 such as the Sharp 79524 I'm using would be plenty
quick
enough. Don't use this one specifically as it had loads of
peripherals
you won't need but the Phillips LPC range should cater for your
needs.

The LPC line indeed looks attractive bacuse there are many
pre-assembled
testing modules available (like the stuff offered by Olimex), and I
think Linux is by now pretty well-suited as a development system.

There are plenty of tools for developing under linux but there is more
support for windows. If you're thinking about running Linux on your
target then I'd think twice. You probably don't need an OS at all but if
you must then something smaller and easier - like FreeRTOS - would be
better suited.

Another question, maybe really stupid: Skimming over some of these
datasheets I've noticed the absence of any externally available,
"classical" address and data bus. Everything seems to be
general-purpose
I/O. Does that mean that I have to implement my own protocol for
addressing external devices on a bus, or can the I/O pins be somehow
switched into "von Neumann" mode?

I'm sure all this will be readily answered by documentation available
on
the 'Web. I'm looking.

Thanks,
robert

Off the top of my head I believe that usually pins are normally
multi-purpose and could be GPIO if you wanted or, if part of a memory
controller, defined as being address/data lines.

<rummages through data ***>

Yes, I have 32bit data/address and the lower 16 address bits and 8 data
bits have dedicated pins. The rest are multiplexed with GPIO.


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