lesson10.asm

这里提供了一些单片机的实验方面的小程序

   
            ORG   0000H

   SQU_K  BIT    P3.4
   SAW_K  BIT    P3.5
   TRI_K  BIT    P3.6
   SIN_K  BIT    P3.7

   SQU_L  BIT    P1.0
   SAW_L  BIT    P1.1
   TRI_L  BIT    P1.2
   SIN_L  BIT    P1.3


   START:  MOV   P1,#0FFH
           MOV   P2,#0FFH
           MOV   P3,#0FFH
           MOV   DPTR,#SIN_TAB


   MAIN:   MOV   P0,#00H
           JNB   SQU_K,S1
           SETB   SQU_L
           JNB   SAW_K,S2
           SETB  SAW_L
           JNB    TRI_K,S3
           SETB    TRI_L
           JNB    SIN_K,S4
           SETB    SIN_L
           SJMP   MAIN

    S1:  CLR   SQU_L
         LCALL  SQUARE
         SJMP   MAIN

    S2:   CLR   SAW_L
         LCALL   SAWTOOTH
         SJMP   MAIN

    S3:  CLR   TRI_L
         LCALL  TRIANG
         SJMP   MAIN

    S4:  CLR  SIN_L
         LCALL  SINWAVE
         SJMP  MAIN


  SQUARE:
         MOV  R0,#00H

     J11: MOV  P0,#0FFH
          MOV  P2,#0FFH
          MOV  A,P2
          CPL  A
          MOV  R3,A

L11:DEC  R3
     CJNE  R3,#255,L11
      INC  R0
      INC  R0
      CJNE  R0,#254,J11
      MOV  R0,#00H

 J12:
       MOV  P0,#00H
       MOV  P2,#0FFH
       MOV  A,P2
       CPL  A
       MOV  R3,A

  L12:DEC  R3
       CJNE  R3,#255,L12
       INC R0
       INC R0
       CJNE  R0,#254,J12
       MOV  R0,#00H
       RET




    SAWTOOTH:
             CLR  A
            MOV  R7,A

        J21: MOV  P0,R7
               MOV  P2,#0FFH
               MOV  A,P2
               CPL  A
               MOV  R3,A

        L21: DEC  R3
             CJNE  R3,#255,L21
             INC  R7
             CJNE  R7,#255,J21
             RET



    TRIANG: MOV  R7,#00H

       J31: MOV  P0,R7
            MOV  P2,#0FFH
            MOV  A,P2
            CPL  A
            MOV  R3,A

       L31:DEC  R3
           CJNE  R3,#255,L31
           INC  R7
           INC  R7
           CJNE  R7,#254,J31

       J32:MOV  P0,R7
           MOV  P2,#0FFH
           MOV  A,P2
           CPL A
           MOV  R3,A

       L32:DEC  R3
           CJNE  R3,#255,L32
           DEC  R7
           DEC  R7
           CJNE  R7,#00,J32
           RET


    SINWAVE:MOV  R0,#00H

        K41:MOV  A,R0
            MOVC  A,@A+DPTR
            MOV   P0,A
            INC  R0
            MOV  P2,#0FFH
            MOV  A,P2
            CPL  A
            MOV  R3,A

        L41:DEC  R3
            CJNE  R3,#255,L41
            CJNE  R0,#85,K41

        K42:DEC  R0
            MOV  A,R0
            MOVC  A,@A+DPTR
            MOV  P0,A
            MOV  P2,#0FFH
            MOV  A,P2
            CPL  A
            MOV  R3,A

         L42:DEC   R3
            CJNE  R3,#255,L42
            CJNE  R0,#0,K42
            RET



    SIN_TAB:
             DB  0,0,0,0
             DB  1,1,2,3,4,5,6,8
             DB  9,11,13,15,17,19,22,24
             DB  27,30,33,36,39,42,46,49
             DB  53,56,60,64,68,72,76,80
             DB  84,88,92,97,101,105,110,114
             DB  119,123,128,132,136,141,145,150
             DB  154,158,163,171,175,179,183
             DB  187,191,195,199,202,206,209,213
             DB  216,219,222,225,228,231,233,236
             DB  238,240,242,244,246,247,249,250
             DB  251,252,253,254,255,255,255

       END