單片機(jī)動(dòng)態(tài)數(shù)碼管顯示hello匯編程序

51單片機(jī)動(dòng)態(tài)數(shù)碼顯示技術(shù)
電路是P0口接數(shù)碼管的字型碼筆段，P2口接數(shù)碼管的數(shù)位選擇端，P1。7接一個(gè)開關(guān)，當(dāng)開關(guān)接高電平時(shí)，顯示“12345”字樣；當(dāng)開關(guān)接低電平時(shí)，顯示“hello”字樣。
匯編語言源程序：
               ORG 00H
     START: JB P1.7,DIR1
               MOV DPTR ,#TABLE1
               SJMP DIR
    DIR1:   MOV DPTR ,#TABLE2
      DIR:   MOV R0,#00H
               MOV R1,#01H
     NEXT: MOV A,R0
              MOVC A,@A+DPTR
              MOV P0,A
              MOV A,R1
              MOV P2,A
              LCALL DAY
              INC R0
              RL A
              MOV R1,A
              CJNE R1,#0DFH,NEXT
              SJMP START
   DAY:    MOV R6,#4
     D1:    MOV R7,#248
              DJNZ R7,$
              DJNZ R6,D1
              RET
TABLE1: DB 06H,5BH,4FH,66H,6DH
TABLE2: DB 78H,79H,38H,38H,3FH
             END