f84atmpo.asm

16位PIC单片机汇编语言编写模板1。学习16位单片机的好资料

;**********************************************************************
;   This file is a basic code template for assembly code generation   *
;   on the PICmicro PIC16F84A. This file contains the basic code      *
;   building blocks to build upon.                                    *  
;                                                                     *
;   If interrupts are not used all code presented between the ORG     *
;   0x004 directive and the label main can be removed. In addition    *
;   the variable assignments for 'w_temp' and 'status_temp' can       *
;   be removed.                                                       *                        
;                                                                     *
;   Refer to the MPASM User's Guide for additional information on     *
;   features of the assembler (Document DS33014).                     *
;                                                                     *
;   Refer to the respective PICmicro data sheet for additional        *
;   information on the instruction set.                               *
;                                                                     *
;   Template file built using MPLAB V4.00 with MPASM V2.20 and        *
;   MPLINK 1.20 as the language tools.                                *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Filename:	    xxx.asm                                           *
;    Date:                                                            *
;    File Version:                                                    *
;                                                                     *
;    Author:                                                          *
;    Company:                                                         *
;                                                                     * 
;                                                                     *
;**********************************************************************
;                                                                     *
;    Files required:                                                  *
;                                                                     *
;                                                                     *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Notes:                                                           *
;                                                                     *
;                                                                     *
;                                                                     *
;                                                                     *
;**********************************************************************


	list      p=16F84A            ; list directive to define processor
	#include <p16F84.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 (examples)

; example of using Uninitialized Data Section
INT_VAR       UDATA     0x0C   
w_temp        RES     1           ; variable used for context saving 
status_temp   RES     1           ; variable used for context saving

; example of using Overlayed Uninitialized Data Section
; in this example both variables are assigned the same GPR location by linker
G_DATA        UDATA_OVR           ; explicit address can be specified
flag          RES     2           ; temporary variable (shared locations - G_DATA)

G_DATA        UDATA_OVR   
count         RES     2           ; temporary variable (shared locations - G_DATA)




;**********************************************************************
RESET_VECTOR  CODE    0x000       ; processor reset vector
  		goto    start             ; go to beginning of program


INT_VECTOR   CODE    0x004        ; interrupt vector location
		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


; isr code can go here or be located as a call subroutine elsewhere


		movf    status_temp,w     ; retrieve copy of STATUS register
		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    CODE
start

        nop                       ; code starts here (example)
        banksel  flag             ; example 
        clrf   flag               ; example
; remaining code goes here










		END                     ; directive 'end of program'