According to my limited google, the STV5730 went end of life in 2005.
I did come across this site which might offer you some info. It contains hex for a PIC (16F873) and schematics http://www.pi6tv.net/picosd/picosd_uk.html
Also that he uses the same Xtal (17,734475 MHz) as a reference for both chips. The PIC code uses a 20Mhz xtal, and has a different pin out to that specified in the 16F873 code.
I think you need to link to the source of the PBP code and presumably the associated schematic etc
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