If you consider PICs (which would not be a bad choice), do read
http://www.voti.nl/swp

Actually nearly all microcontrollers will be able to do this. So to
narrow your selection down condsider:
- which chips can you actually buy
- for which chips can you get help, preferably locally


Wouter van Ooijen

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http://www.voti.nl
PICmicro chips, programmers, consulting