At Tech, an I'm sure at most other universities, we have embedded microcontroller classes. One of the classes uses the PIC18F452. Here is a link to the class website. If you click on PICbook you can access a few free downloads for this pic (not sure about the compatability with others). Take a look around, you may find something you can use. If not then as KenWittlief said, check the Microchip website.
http://piclab.ece.gatech.edu/
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Jeremy Roberts
GeorgiaFIRST Planning Committee | Peachtree Regional
Georgia Tech RoboJackets FIRST Co-Founder
Engineer/Mentor 4026
Former teams: 132, 608, 832, 1002, 1848
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