maikuangceliang.asm

此代码为89c51单片机的汇编语言

     org    0000h
     ajmp   main
     org    0003h
     ajmp   pint0s
main: mov   sp,#60h        ;中断初始化
      mov   tmod,#09h
      mov   th0,#00h
      mov   tl0,#00h
      setb  it0
      setb  ea
      setb  ex0
      setb  tr0
main1:mov   r0,#79h        ;显示器的始端口
      mov   r1,#02h
      mov   r3,30h          ;读定时器t0的值
      mov   r2,31h
      acall loop2           ;十进制调整
      mov   a,r6            ;BCD码调整
      acall loop4
      mov   a,r5
      acall loop4
main2:acall disp            ;调用显示
      djnz  33h,tt
      sjmp  main1
tt:   sjmp  main2

pint0s:mov  30h,tl0
      mov   31h,th0
      mov   tl0,#00h
      mov   th0,#00h
      reti

loop2:clr   a            ;二进制转换为十进制(r2r3=r4r5r6)
      mov   r4,a
      mov   r5,a
      mov   r6,a
      mov   r7,#16
loop3:clr   c
      mov   a,r3
      rlc   a
      mov   r3,a
      mov   a,r2
      rlc   a             ;c为bi
      mov   r2,a          ;(r4r5r6)+(r4r5r6)=(r4r5r6)*2+c
                          ;十进制加
      mov   a,r6
      addc  a,r6
      da    a
      mov   r6,a
      mov   a,r5
      addc  a,r5
      da    a
      mov   r5,a
      mov   a,r4
      addc  a,r4
      da    a
      mov   r4,a
      djnz  r7,loop3
      ret

loop4:mov   32h,a
      anl   a,#0fh       ;拆为非压缩的BCD数
      mov   @r0,a
      inc   r0
      mov   a,32h
      swap  a
      djnz  r1,loop4
      mov   r1,#02h
      ret

disp: mov  r0,#79h        ;设79H-7C为显示缓冲器
      mov  r3,#1
      mov  a,#0efh
gg:   mov  r4,a         ;数码管动态显示
      mov  p0,#00h
      mov  p2,a
      mov  a,@r0
      mov  dptr,#aa
      movc a,@a+dptr
ee:   mov  p0,a
      acall delay
      inc  r0
      MOV    A,R3
      JB     ACC.3,ff
      RL     A
      MOV    R3,A
      mov    a,r4
      rl     a
      SJMP   gg
ff:    ret

aa:   DB     0EDH,28H,0CBH,0ABH,2EH         ;0,1,2,3,4
      DB     0A7H,0E7H,29H,0EFH,0AFH	    ;5,6,7,8,9

delay:MOV    R7,#02H	                    ;延时子程序
cc:   MOV    R6,#0FFH
dd:   DJNZ   R6,dd
      DJNZ   R7,cc
      RET
      end