I know you're asking for PIC, but does the pdf on this page have any
useful info for you (it's a PC-based controller if you hadn't seen it b4) ?
It seems that the only major adjustment on to the s/w would be the
timing (QBasic v .asm)

http://www.jameco.com/cgi-bin/ncommerce3/ExecMacro/Jameco/pageDisplay.d2w/re
port?content=cc-toc

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http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.