ex2.a51

ID-15 读卡器的读写资料,很古老,但很实用

ORG 	8000H
LJMP 	Main
ORG 	80F0H
Main: 
MOV 	R7, #0 
Loop: 
MOV 	R6, #0
DJNZ 	R6, $
DJNZ 	R6, $
DJNZ 	R6, $
DJNZ 	R6, $
DJNZ 	R7, Loop

CPL 		P1.0 	; P 1 .0 取反
CPL 		P1.1 	; P 1 .1 取反
CPL 		P1.2 	; P 1 .2 取反
CPL 		P1.3 	; P 1 .3 取反
CPL 		P1.4	; P 1 .4 取反
CPL	    	P1.5 	; P 1 .5 取反
CPL 		P1.6 	; P 1 .6 取反
CPL 		P1.7 	; P 1 .7 取反
SJMP 	Main
END