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What is the simplest AVR/PIC/microcontroller?

First note: I understand what microcontrollers are, how to program them, etc. I have my Arduino currently monitoring and, via processing, graphing the temperature of the air blowing out of my laptop during specific tasks. Now then, as of late, I've been obsessed with designing my own microcontroller. I fully understand how huge of a project it is to design a microcontroller, especially for one person. That is why I'm only looking to design maybe a simple 4-bit one, just a few bytes of memory, etc. I understand intermediate digital logic(gates, how to make a full adder, memory cell, mux/demux, etc.). But I don't know how to connect them all to form a programmable circuit. My idea was to just base it loosely on current designs of AVR/PIC microcontrollers(so as not to infringe on any copyrights or patents; just to loosely get an idea of how they work). Simplicity is my goal here. Which AVR/PIC/any other microcontroller is the most simple?

Asked By: - 2/2/2012
Best Answer - Chosen by Asker
I'm assuming you actually mean you want to get some practice in on the idea of designing a micro of some kind. You are in huge luck. I had 7400 series parts to work with and wire wrap and tons of money that had to be spent that I didn't have. You get FPGAs for nearly free, free software tools that include VHDL and... More
Answered By: Jonathan - 2/2/2012
Additional Answers (2)
The PIC10F200 I think is. It's a 6-pin chip comprising of only +5V, GND, 3 GPIO+1 Input-only. It has just 33 instructions
Answered By: EkriirkE - 2/2/2012
 
ATtiny45 or ATtiny85
Answered By: tc_an_american - 2/2/2012
 
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