Embedded processors for DIY projects ?

[Fraser, Colin J]

> -----Original Message-----
> From: Michael Buchstaller [mailto:buchi at takeonetech.de]
> Sent: 01 November 2000 14:47
> To: synth-diy at node12b53.a2000.nl
> Subject: Re: Embedded processors for DIY projects ?
> 
> >any in-system programmable chip will give you ability to upload a
> >monitor of some kind.
> 
> Yes, that is what i want.

Don't overlook the option of using a non-flash CPU with an eprom emulator.

I'm using the 8032 in my sequencer project, with a serial programmable flash
ROM.
The ROM fits a standard eprom socket, with a fly lead on top that plugs into
a PC parallel port.
A full program only takes seconds.

The advantages of this approach are that the CPU is much cheaper (approx 2
ukp) than your AVRs etc, the ROM will hold up to 64k (8051 architecture has
separate program and data access so you can use all 64k for code) and it
still works out cheaper than an AVR with a measly 4k flash on board.
Also, the 8051 series is made by numerous manufacturers. You won't be left
with a design that needs a cpu that was just discontinued by it's only
maker.

The bog standard 8051 loses out on power over more modern CPUs, although
various manufactures make re-vamped devices that run at silly speeds, but it
makes up for it in areas such as free dev tools e.g. Systronix' excellent
RAD51 - http://www.systronix.com/RAD51/RAD51.htm

Colin f