ram_fill.asm

来自「c51 用于cygnal 芯片 」· 汇编 代码 · 共 72 行

;-----------------------------------------------------------------------------
;	CYGNAL INTEGRATED PRODUCTS, 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 (c8051f000.inc)					; Include register definition file.


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


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


           ; Reset Vector
           cseg AT 0
           ljmp Main               ; Locate a jump to the start of code at 
                                   ; the reset vector.


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

Code_Seg   segment  CODE

           rseg     Code_Seg       ; Switch to this code segment.
           using    0              ; Specify register bank for the following
                                   ; program code.


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, AR0			; write to indexed address with address value
					djnz 	R0,loop			  ; check if finished
	
					sjmp 	$					    ; loop here forever


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

END