How to pick a microcontroller platform
embedded.fm
embedded.fm
Microcontrollers come in 8-bit, 16-bit, 32-bit, and even 64-bit variants.
4-bit microcontrollers have existed for a couple decades now: they're used for clocks, timers, etc. The Epson MCUs come with a built-in LCD driver: http://global.epson.com/products/semicon/products/mcu/4bit_i...http://www.brouhaha.com/~eric/retrocomputing/motorola/mc1450...
Really...the mc14500 line is a 1-bit industrial control processor.