单片机编程请求赐教，谢谢....

只看该作者 · 2011-8-10 20:56

本帖最后由 MENGREN 于 2011-8-10 21:34 编辑

刚刚注册的新号，还没有积分，所以不能提供问题分，期待高人无偿赐教，在此拜过。
买了块单片机学习开发板，今天遇到了一个编程问题，关于歌曲《生日快乐》的汇编程序。看了几遍，那个SING子语句，还是不甚清楚，所以请教高人解读下SING语句的意思，谢谢哈。你的无私帮助的不只是我，还有许许多多的同道中人。
程序如下：



   ORG    0000H
      JMP    MAIN
      ORG    000BH
      JMP    INTT0
      ORG    0100H
MAIN: MOV    SP,#60H
      MOV    TMOD,#01H
      SETB ET0
      SETB EA
      SETB TR0
START0: ;clr P1.5
      MOV    30H,#00H
NEXT: MOV    A,30H
      MOV    DPTR,#TABLE
      MOVC A,@A+DPTR
      MOV    R2,A
      JZ    ENDD
      ANL    A,#0FH
      MOV    R5,A
      MOV    A,R2
      SWAP A
      ANL    A,#0FH
      JNZ    SING
      CLR    TR0
      JMP    D1
SING: DEC    A
      MOV    22H,A
      RL    A
      MOV    DPTR,#TABLE1
      MOVC A,@A+DPTR
      MOV    TH0,A
      MOV    21H,A
      MOV    A,22H
      RL    A
      INC    A
      MOVC A,@A+DPTR
      MOV    TL0,A
      MOV    20H,A
      SETB TR0
D1:    CALL DELAY
      INC    30H
      JMP    NEXT
ENDD: CLR    TR0
      JMP    START0
INTT0:
      PUSH PSW
      PUSH ACC
      MOV    TL0,20H
      MOV    TH0,21H
      CPL    P1.5
      POP    ACC
      POP    PSW
      RETI
DELAY:  MOV    R7,#02
DELAY0: MOV    R4,#187
DELAY1: MOV    R3,#248
      DJNZ R3,$
      DJNZ R4,DELAY1
      DJNZ R7,DELAY0
      DJNZ R5,DELAY
      RET
TABLE:  DB 82H,01H,81H,94H,84H,0B4H,0A4H,04H
      DB 82H,01H,81H,94H,84H,0C4H,0B4H,04H
      DB 82H,01H,81H,0F4H,0D4H,0B4H,0A4H,94H
      DB 0E2H,01H,0E1H,0D4H,0B4H,0C4H,0B4H,04H
      DB 82H,01H,81H,94H,84H,0B4H,0A4H,04H
      DB 82H,01H,81H,94H,84H,0C4H,0B4H,04H
      DB 82H,01H,81H,0F4H,0D4H,0B4H,0A4H,94H
      DB 0E2H,01H,0E1H,0D4H,0B4H,0C4H,0B4H,04H
//TABLE1: DW 64260,64400,64524,64580,64684,64777,64820,64898
//    DW 64968,65030,65058,65110,65157,65178,65217


END