p10_2.asm

单片机原理与应用实例教程 单片机原理与应用实例教程

		ORG		0000H
		LJMP	MAIN
		ORG		4100H
MAIN:	MOV DPTR, #1200H
		MOV A, #01010101B
		MOVX @DPTR, A
LOOP:	MOVX A, @DPTR
		RL	A
		MOV C, ACC.0
		MOV P3.3, C
		ACALL DELAY
		MOVX @DPTR, A
		AJMP LOOP		

DELAY:	MOV R5, #5H
DL3:	MOV R7, #82H		;延迟程序
DL1:	MOV R6, #0FFH
DL2:	NOP
		DJNZ R6, DL2
		DJNZ R7, DL1
		DJNZ R5, DL3
		RET
		
		END