s14-4.asm

手把手教你学单片机实验程序

	ORG 0000H
	LJMP MAIN
	ORG 030H
MAIN:	MOV R0,#0
	MOV A,#0FFH
LOOP:	CPL A
	MOV P0,A
	ACALL DEL
	CJNE R0,#40,LOOP
	SJMP $
DEL: 	MOV R7,#0FFH
DEL1:	MOV R6,#0FFH
DEL2:   MOV R5,#08H
DEL3:	DJNZ R5,DEL3
	DJNZ R6,DEL2
	DJNZ R7,DEL1
	INC R0
	RET
	END