报警.asm

本科优秀毕业设计,倒车雷达,用单片机和c51实现的!

   ORG 0000H
   JMP MAIN

MAIN:

	  MOV SP,#4FH
	  MOV P0,#0FFH
	  MOV P1,#0FFH
	  MOV P2,#0FFH
	  MOV P3,#0FFH

      SETB P3.1
GOON: CALL DISPLAY
	  CPL  P3.1
	  
	  JMP  GOON



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 DL1MS
            INC R1            
            MOV A,R5 
			JNB ACC.0,ENDOUT
            RR A                  
            MOV R5,A              
           	JMP PLAY
ENDOUT:     MOV P1,#0FFH
			MOV P0,#0FFH            
            
			RET                      ;显示完成，返回
;
TABLE:DB 03H,9FH,25H,0DH,99H,49H,41H,01FH,01H,09H,03H
;;晶振12MHZ,延时0.25秒



DL1MS:      MOV R6,#14H
DL1:		MOV R7,#19H
DL2:  		DJNZ R7,DL2
			DJNZ R6,DL1

			RET






END