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align=left><BR>;99计数器<BR><BR>;***************************************************************************<BR>;*
(程序转载请著明出处 ，未声明可适应本站腾龙/isp开发套件/倚天版开发套件
*<BR>;* E-mail:sxj1974@163.com (51c51 test web)
51单片机学习网，自学单片机的网站
*<BR>;* Create by :石学军 <A
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*<BR>;***************************************************************************
<BR>a_bit equ 20h<BR>b_bit equ 21h<BR>temp equ 22h<BR><BR>star: mov
temp,#0 ;初始化<BR>stlop: acall display ;调用显示子程序<BR>inc temp ;缓冲区加一.<BR>mov
a,temp<BR>cjne a,#100,next<BR>mov temp,#0<BR>next: ljmp stlop
;循环显示<BR><BR>display: mov a,temp<BR>mov b,#10<BR>div ab<BR>mov b_bit,a
;分开十位和个位.<BR>mov a_bit,b<BR><BR>mov dptr,#numtab<BR>mov r0,#4<BR>dpl1: mov
r1,#250<BR>dplop: mov a,a_bit<BR>MOVC A,@A+DPTR ;查表取欲显示的数据<BR>mov p0,a
;送显示<BR>clr p2.6 ;开通位选<BR>acall d1ms<BR>setb p2.6<BR>mov a,b_bit<BR>MOVC
A,@A+DPTR ;显示十位.<BR>mov p0,a<BR>clr p2.5<BR>acall d1ms<BR>setb
p2.5<BR>djnz r1,dplop ;100次没完循环<BR>djnz r0,dpl1
;4个100次没完循环<BR>ret<BR><BR><BR>D1MS: MOV R7,#80<BR>DJNZ
R7,$<BR>RET<BR><BR><BR>numtab: db
28h,7eh,0a2h,62h,74h,61h,21h,7ah,20h,60h<BR>;0 1 2 3 4 5 6 7 8
9<BR><BR><BR>end<BR><FONT color=#454545
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