999timer.asm

999秒的定时器

    ORG 0000H
    ajmp main
    ORG 000bh
    ajmp wt0
    org 0020h
main:mov 33h,#03h
     mov 34h,#0h
     mov 35h,#0h
     mov sp,#40h
     mov 20h,#0h
     mov 21h,#0h
     mov 22h,#0h
     mov TH0,#06h
     mov TL0,#06h
     mov TMOD,#02h
     setb ea
     setb et0
     clr tr0
ts:  mov 23h,33h
     mov 24h,34h
     mov 25h,35h
     mov r0,#25h
m: acall dsp
     jnb p3.4,tz
     jnb p3.5,dz
     jnb p3.3,sz
     ajmp m

sz:  acall dl
     jb p3.3,m
pss:  jnb p3.3,$
     mov 33h,23h
     mov 34h,24h
     mov 35h,25h
     setb tr0
     clr 00h
s:   acall dsp
q:   jnb p3.3,ts
     jnb 00h,s
     clr p3.7
     acall dl
     setb p3.7
     ajmp ts
tz:  acall dl
     jb p3.4,m
pk:  jnb p3.4,pk
     inc @R0
     mov A,@R0
     cjne A,#0ah,pk22
     mov @r0,#0h
pk22: ajmp m

dz:  acall dl
     jb p3.5,m
ppk: jnb p3.5,ppk
     dec r0
     mov a,r0
     cjne a,#22h,ppk22
     mov  r0,#25h
ppk22: ajmp m


tab: db 0c0h,0f9h,0a4h,0b0h,99h
     db 92h,82h,0f8h,80h,90h


dl:  mov r7,#02h
dl1: mov r6,#0ffh
dl2: djnz r6,dl2
     djnz r7,dl1
     ret


dsp: mov r7,#200
     mov r2,#8
     mov dptr,#tab
dsp0: mov a,25h
     movc a,@a+dptr
rx1: mov p1,a
     clr p3.0
     djnz r7,rx1
     mov r7,#200
     mov a,24h
     movc a,@a+dptr
     setb p3.0
rx2: mov p1,a
     clr p3.1
     djnz  r7,rx2
     mov r7,#200
     mov a,23h
     movc a,@a+dptr
     setb p3.1
rx3: mov p1,a
     clr p3.2
     djnz r7,rx3
     setb p3.2
     djnz r2,dsp0
     ret

wt0: inc 21h
     mov a,21h
     cjne a,#0c8h,toreti
     mov 21h,#0h
     inc 22h
     mov a,22h
     cjne a,#10,toreti
     mov 22h,#0h
     mov a,25h
     jz wt1
     dec 25h
     ajmp toreti
wt1: mov a,24h
     jz wt2
     dec 24h
     mov 25h,#09h
     ajmp toreti
wt2: mov a,23h
     jz wt3
     dec 23h
     mov 24h,#9
     mov 25h,#9
     ajmp toreti
wt3: clr tr0
     setb 00h
toreti: reti
      end
  
     

         
       
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