> Interrupt:
>     bcf           INTCON,GIE
>     btfss        INTCON,GIE
>     goto        $ - 2

Interrupts are already off by the time you get into the interrupt routine.
Nothing will magically re-enable them.

>     bsf          PORTB,LED    ; turn on LED
>     call         Delay15ms
>     call         Delay15ms
>     call         Delay15ms
>     call         Delay15ms
>     bcf         PORTB,LED
>     btfsc      PIR1,RCIF       ; see if RX flag is set
>     call        RS232_Receive  ; if it is, call RS232_Receive
>     retfie

Read the section about interrupts carefully.  You have major misconceptions
here.  For example, this interrupt routine will randomly and asynchronously
appear to trash state in the foreground routine.  After reading and
understanding the manual, see QQQ_INTR.ASPIC at http://www.embedinc.com/pic
as an example interrupt module.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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