8-9-3.asm

书籍8051入门篇

;8-9-3.ASM
COUNT	DATA	30H
$MOD51
	ORG	0000H
	MOV	P1,#0FFH	;将FFH送到P1
	MOV	COUNT,#3FH
;
LOOP:	SETB	P1.5		;P1.5=1,LED不亮
	ACALL	DELAY
	CLR	P1.5		;P1.5=0,LED亮
	ACALL	DELAY
	DJNZ	COUNT,LOOP
	SJMP	$		;ENDLESS LOOP
;				
DELAY:	MOV	R2,#00H		;R2=00H				
DLY1:	MOV	R3,#00H		;R3=00H
	DJNZ	R3,$		;把R3内容减1直到R3=0		
	DJNZ	R2,DLY1		;R2-1
	RET					
;
	END