You could look at the MC68HC908QY4 from Freescale. I don't think it has eeprom or uart but has just about everything else - they might even have variants without those goodies. Programming them is a bitch if you use the app note programmer, might be easier if you spend $ on something more upmarket. Apart from that, its a HC05 with more, quite zippy and much nicer than a PIC to program in assembler. Freescale also give away the Metroworks codewarrior 'c' compiler and tools limited to 4k. I did my whole project in 'c' - I only had to write a few lines of code as the package comes with a tricky code generator that did most of the work for me.

These cost around $1AUD in smallish quantities.


I doubt if you'd be too successful in marketing a small cpu - the package cost could easily outstrip the cost of silicon inside, so its probably just as economical to have the cpu with the kitchen sink - look at the Luminary parts - they crow about $1USD in quantity for their 'small' parts - 8k flash and a 32bit cpu. Ask Lynn for his comments.