显示.asm

本科优秀毕业设计,倒车雷达,用单片机和c51实现的!

	ORG  0000H
    LJMP  START



START:	MOV SP,#4FH
		MOV P0,#0FFH
		MOV P1,#0FFH
		MOV 40H,#00
		MOV 41H,#01
		MOV 42H,#02
		MOV 43H,#03
		MOV 44H,#04
		MOV 45H,#05
		MOV 46H,#06
		MOV 47H,#07
	    MOV 48H,#08
		MOV 49H,#09



DISPLAY:    MOV R1,#40H 
			MOV R5,#07FH
PLAY:       MOV A,R5     
            MOV P0,#0FFH
			MOV P1,A
			MOV A,@R1

			MOV DPTR,#TABLE
            MOVC A,@A+DPTR 
            MOV P0,A   
			CALL DELAY
            INC R1            
            MOV A,R5 
			JNB ACC.0,ENDOUT
            RR A                  
            MOV R5,A              
           	JMP PLAY
ENDOUT:     MOV P1,#0FFH
			MOV P0,#0FFH            
            
		
            JMP DISPLAY                ;显示完成，返回
TABLE:DB 03H,9FH,25H,0DH,99H,49H,41H,01FH,01H,09H,0FFH  ;0-9,最后一个为全灭 
        

;;晶振12MHZ,延时1秒

DELAY:MOV 72H,#100
LOOP3:MOV 71H,#100
LOOP1:MOV 70H,#47
LOOP0:DJNZ 70H,LOOP0
      NOP 
      DJNZ 71H,LOOP1
      MOV 70H,#46
LOOP2:DJNZ 70H,LOOP2
      NOP
      DJNZ 72H,LOOP3
      MOV 70H,#48
LOOP4:DJNZ 70H,LOOP4 

    RET



END