led.asm

用组合语言编写的8051控制LED亮灭的程序,适合8051的初学者.

ORG 0100H
tmp1: DB 01H,02H,04H,08H,10H,20H,40H,80H,81H,82H
tmp2: DB 84H,88H,90H,0A0H,0C0H,0C1H,0C2H,0C4H,0C8H,0D0H
tmp3: DB 0E0H,0E1H,0E2H,0E4H,0E8H,0F0H,0F1H,0F2H,0F4H,0F8H
tmp4: DB 0F9H,0FAH,0FCH,0FDH,0FEH,0FFH,0FFH,00H,0FFH,00H



ORG 0000H
LJMP MAIN
ORG 0200H
MAIN:MOV DPTR,#0100H	
	MOV R7,#40
	LCALL DELAY
	LCALL DELAY
L2:	CLR A
	MOVC A,@A+DPTR
	CPL A
	MOV P2,A
	LCALL DELAY
	INC DPTR
	DJNZ R7,L2
	LJMP MAIN

DELAY:	MOV R5,#255
D1:	MOV R6,#255
	DJNZ R6,$
	DJNZ R5,D1
	RET
END