jnb.asm

4个按键判断指令防真实验 4个按键判断指令防真实验

     ORG  0000H
     LJMP MAIN
     ORG  001CH
MAIN:JNB P3.2,L1
     LCALL DELAY
     JNB P3.3,L2
     LCALL DELAY
	 JNB P3.4,L3
	 LCALL DELAY
	 JNB P3.5,L4
	 LJMP MAIN
L1:  MOV P1,#00H
     LCALL DELAY
	 MOV P1,#0FFH
	 LCALL DELAY
	 JNB P3.3,L2
	 JNB P3.4,L3
	 JNB P3.5,L4
	 LJMP L1
L2:  MOV A,#0FEH
SS:  MOV P1,A
	 LCALL DELAY
	 JNB P3.2,L1
	 JNB P3.4,L3
	 JNB P3.5,L4
	 RL A
	 LJMP SS
L3:  MOV A,#01H
     SETB C
DD:  MOV P1,A         
	 LCALL DELAY
	 JNB P3.2,L1
     JNB P3.3,L2
	 JNB P3.5,L4	 
	 RLC A
	 CPL C
	 LJMP DD
L4:  MOV 30H,#0FFH
     MOV R0,#30H
	 MOV A,#55H
	 ANL A,@R0
EE:	 MOV P1,A
	 LCALL DELAY
	 JNB P3.2,L1
     JNB P3.3,L2
	 JNB P3.4,L3
	 RL A
	 LJMP EE
DELAY: MOV R1,#255
    QQ:MOV R2,#255
	   DJNZ R2,$
	   DJNZ R1,QQ
	RET
	END