Have a look at this article. The PIC controls a Linx LR transmitter with data received from the PC serial port. It simulates the Holtek 8-bit encoder, and can control a Linx FCTN-RLY4-xxx receiver/relay, or a Linx KH2 receiver module. Both use the Holtek 8-bit decoder IC.

http://www.myamicus.co.uk/content.ph...Remote-Control

And this thread: http://www.picbasic.co.uk/forum/showthread.php?t=6581 has PBP code for decoding a Holtek 8-bit encoder.