;**********************************************************************
;   This file is a basic code template for assembly code generation   *
;   on the PIC16C61. This file contains the basic code                *
;   building blocks to build upon.                                    *  
;                                                                     *
;   Refer to the MPASM User's Guide for additional information on     *
;   features of the assembler (Document DS33014).                     *
;                                                                     *
;   Refer to the respective PIC data sheet for additional             *
;   information on the instruction set.                               *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Filename:      xxx.asm                                           *
;    Date:                                                            *
;    File Version:                                                    *
;                                                                     *
;    Author:                                                          *
;    Company:                                                         *
;                                                                     * 
;                                                                     *
;**********************************************************************
;                                                                     *
;    Files required: P16C61.INC                                       *
;                                                                     *
;                                                                     *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Notes:                                                           *
;                                                                     *
;                                                                     *
;                                                                     *
;                                                                     *
;**********************************************************************


    list      p=16c61             ; list directive to define processor
    #include <p16c61.inc>         ; processor specific variable definitions

    __CONFIG   _CP_OFF & _WDT_ON & _PWRTE_ON & _RC_OSC 

; '__CONFIG' directive is used to embed configuration data within .asm file.
; The lables following the directive are located in the respective .inc file.
; See respective data sheet for additional information on configuration word.


;***** VARIABLE DEFINITIONS
w_temp        EQU     0x0C        ; variable used for context saving 
status_temp   EQU     0x0D        ; variable used for context saving


;**********************************************************************
PROCESSOR_RESET CODE    0x000             ; processor reset vector
        goto    main              ; go to beginning of program

ISR     CODE    0x004             ; interrupt vector location

Interrupt:
        movwf   w_temp            ; save off current W register contents
        movf    STATUS,w          ; move status register into W register
        movwf   status_temp       ; save off contents of STATUS register
        movf    status_temp,w     ; retrieve copy of STATUS register
        
        ;Place ISR Here
        
        movwf   STATUS            ; restore pre-isr STATUS register contents
        swapf   w_temp,f
        swapf   w_temp,w          ; restore pre-isr W register contents
        retfie                    ; return from interrupt

MAIN_PROGRAM    CODE    

main:

; remaining code goes here

        END                       ; directive 'end of program'

