Navtex Receiver

[santamaria]

I start to built a navtex receiver with 16f876.i found on net sample code but it is in assembly and i can't understand what happends there.With little asm code that i can undestand i found that working with capture module to find if the sitor bits is 1 or 0 ,also he enables timer0 for taking 10 samples per sitor bits pwm etc.I can't understand how the interrupt is working and how to decode the navtex signal.I don't care about serial input or output or how to drive the lcd(i have made working code for lcd).below i have the code and if someone can explain me what he is doing there to start built the code or if it is possible to add the assembly code for reception and then put my code there but i don't know how to work with variables in assembly and pbp.

thanks