672tempo.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 object module code         *
;   generation on the PICmicro PIC12C672. This file contains the      *
;   basic code building blocks to build upon.  As a project minimum   *
;   the 12c672.lkr file will also be required for this file to        *
;   correctly build. The .lkr files are located in the MPLAB          *  
;   directory.                                                        *
;                                                                     *
;   If interrupts are not used all code presented between the         *
;   code section "INT_VECTOR" and code section "MAIN" can be removed. *
;   In addition the variable assignments for 'w_temp' and             *
;   'status_temp' can be removed.                                     *
;                                                                     *
;	If interrupts are used, as in this template file, the 12c672.lkr  *
;   file will need to be modified. Refer to the readme.tmp file for   *
;   this information.                                                 *
;                                                                     *
;   If the internal RC oscillator is not implemented then the first   *
;   four instructions after the code section "MAIN" are not required. *
;                                                                     *
;   Refer to the MPASM User's Guide for additional information on     *
;   features of the assembler and linker (Document DS33014F).         *
;                                                                     *
;   Refer to the respective PICmicro data sheet for additional        *
;   information on the instruction set.                               *
;                                                                     *
;   Template file built using MPLAB V3.99.18 with MPASM V2.15.06 and  *
;   MPLINK 1.10.11 as the language tools.                             *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Filename:	    xxx.asm                                           *
;    Date:                                                            *
;    File Version:                                                    *
;                                                                     *
;    Author:                                                          *
;    Company:                                                         *
;                                                                     * 
;                                                                     *
;**********************************************************************
;                                                                     *
;    Files required:                                                  *
;                                                                     *
;                                                                     *
;                                                                     *
;**********************************************************************
;                                                                     *
;    Notes:                                                           *
;                                                                     *
;                                                                     *
;                                                                     *
;                                                                     *
;**********************************************************************

	list      p=12c672            ; list directive to define processor
	#include <p12c672.inc>        ; processor specific variable definitions

	errorlevel  -302              ; suppress message 302 from list file

	__CONFIG   _CP_OFF & _WDT_ON & _MCLRE_ON & _PWRTE_ON & _EXTRC_OSC_CLKOUT 

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




;***** VARIABLE DEFINITIONS (examples)

; example of using Uninitialized Data Section
INT_VAR       UDATA_SHR   
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     1           ; temporary variable (shared locations - G_DATA)

G_DATA        UDATA_OVR   
count         RES     1           ; 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


; these first 4 instructions are not required if the internal oscillator is not used
MAIN    CODE
start
		call    0x7FF             ; retrieve factory calibration value
		bsf     STATUS,RP0        ; set file register bank to 1 
		movwf   OSCCAL            ; update register with factory cal value 
		bcf     STATUS,RP0        ; set file register bank to 0


; remaining code goes here


 



		END                       ; directive 'end of program'