0~9led

基于单片机的0~9led倒序显示

        LED1 BIT P2.0
	ORG 0000H
	LJMP START
	ORG 030H
START:	MOV 20H,#00H  
	MOV A,20H	
	MOV R4,#3
	MOV R0,#10
MAIN:	  
	MOV DPTR,#TAB	
	MOVC A,@A+DPTR	
	MOV P3,A	    
  	ACALL DEL	   
	MOV A,20H	
	INC A					
	MOV 20H, A
	DJNZ R0,MAIN
	JMP LED
	RETI
LED:	CLR LED1
	ACALL DEL01
	SETB LED1
	ACALL DEL01
	DJNZ R4,LED
	JMP START
DEL: 	MOV R7,#05
DEL1:	MOV R6,#0FFH
DEL2:   MOV R5,#0FFH
DEL3:	DJNZ R5,DEL3
	DJNZ R6,DEL2
	DJNZ R7,DEL1
	RETI
DEL01: 	MOV R1,#03
DEL11:	MOV R2,#0FFH
DEL21:  MOV R3,#0FFH
DEL31:	DJNZ R3,DEL31
	DJNZ R2,DEL21
	DJNZ R1,DEL11
	RETI
TAB:	DB 90H,80H,0F8H,82H,92H,99H,0B0H,0A4H,0F9H,0C0H	 
	END