频率计初步1.asm

是我在电子竞赛期间写的一些单片机汇编程序

ledf equ 0a000h
org 0000h
ajmp main
org 0003h
ajmp intx0
org 000bh
ajmp intt0
org 0100h
main:
      mov     sp,#5fh
      setb    it0
      setb    px0        ;外部中断0优先
      mov     tmod,#01h
xiayi:mov     th0,#0ech
      mov     tl0,#78h
      SETB    EA
      SETB    ET0
      SETB    EX0   ;   外中断
      setb    tr0
      mov     r7,#0c8h
wait: acall   display
      cjne    r7,#00h,wait
      mov     ie,#00h   ;只显示一秒到时的所测频率
      clr     tr0
      mov     r1,#30h;   (30h)送到40单元
      mov     r0,#40h
zaici:mov     b,@r1
      mov     @r0,b
      inc     r0
      inc     r1
      cjne    r1,#38h,zaici
      mov     r0,#30h
fanh: mov     @r0,#00h  ;将显示寄存器地址内容清零
      inc     r0
      cjne    r0,#38h,fanh
      ajmp    xiayi


display:
      mov        dptr,#ledf
      mov        r0,#40h
next: mov        a,@r0
      acall      table
      movx       @dptr,a
      acall      delay
      inc        r0
      inc        dptr
      cjne       r0,#48h,next
      ret


intx0:      ;外中段
      push        psw
      push        acc
      clr         ex0  ;禁止外中断
      mov         r1,#30h
cmp:  cjne        @r1,#09h,first
      mov         @r1,#00h
      inc         r1
      cjne        r1,#38h,cmp
      ajmp        wanbi
first:inc         @r1
wanbi:setb        ex0
      pop         acc
      pop         psw
      reti


intt0:               ;定时器0中断
      push     psw
      push     acc
      clr      tr0
      mov      th0,#0ech
      mov      tl0,#78h
      dec      r7
huiqu:setb     tr0
      pop      acc
      pop      psw
      reti


;delay:
;       mov       r5,#10h
;delay0:mov       r4,#40h
;delay1:djnz      r4,delay1
;       djnz      r5,delay0
;       ret


table:
      inc       a
      movc      a,@a+pc
      ret
      db        0c0h,0f9h,0a4h,0b0h,099h,092h,082h,0f8h,80h,090h
      end