Hi mackrackit.

My mistake, I should have said:

If the count reaches 65536ms then the Interrupt flag TMR1IF PIR.0 goes to 1 then the program jumps to:
Code:
RESET_VT
Not the DEFINE.

So when the program jumps after PIR.0 = 1 to RESET_VT it then runs the Register saving code, then the INTERRUPT routine, then restores all the previously saved values back to exactly the same condition as pre - RESET_VT. Can we come back to that part the ASM stuff later but for now assume there was some DATA received and the next block of PBP code.

Dave