ram_fill.asm

来自「8051试验程序 基础教材」· 汇编 代码 · 共 67 行

;-----------------------------------------------------------------------------
;	Copyright (C) 2005 Silicon Laboratories, Inc.
;
;
; 	FILE NAME  	: RAM_FILL.ASM
; 	TARGET MCU	: C8051F000
; 	DESCRIPTION	: This program disables the watchdog timer and fills RAM with
;				  	  value equal to address.
;
;  	NOTES:
;	(1)	This note intentionally left blank.
;
;
;-----------------------------------------------------------------------------


;-----------------------------------------------------------------------------
; EQUATES
;-----------------------------------------------------------------------------

#include "ioC8051F000.h"					; Include register definition file.


;-----------------------------------------------------------------------------
; VARIABLES
;-----------------------------------------------------------------------------
	


																
;-----------------------------------------------------------------------------
; RESET and INTERRUPT VECTORS
;-----------------------------------------------------------------------------


           ; Reset Vector
           ASEGN CSEG01:CODE,0
           ljmp Main               ; Locate a jump to the start of code at
                                   ; the reset vector.


;-----------------------------------------------------------------------------
; MAIN PROGRAM CODE
;-----------------------------------------------------------------------------

            RSEG RAM_FILL:CODE ; switch to code segement

Main: 			; Disable the WDT. (IRQs not enabled at this point.)
					; If interrupts were enabled, we would need to explicitly disable
					; them so that the 2nd move to WDTCN occurs no more than four clock
					; cycles after the first move to WDTCN.
					mov	WDTCN, #0DEh
					mov	WDTCN, #0ADh

					mov 	R0, #00H		  ; use R0 as pointer to memory location
loop:			                mov 	@R0, 0			  ; write to indexed address with address value -- register bank 0
					djnz 	R0,loop			  ; check if finished
	
					sjmp 	$			  ; loop here forever


;-----------------------------------------------------------------------------
; End of file.

          END