【正文】 ～27,411～417附錄A 程序清單 limiw equ 30h 。厘米位 miao equ 31h 。秒位 fenmi equ 32h 。分米位 fmiao equ 33h 。分秒位 meter equ 34h 。米位 fenzh equ 35h 。分位 point equ 36h 。小數(shù)點位 shimi equ 37h 。十米位 shifn equ 38h 。十分位 sudu equ 39h 。速度控制 jishk equ 3ah 。記時開始 zhond equ 3bh zhodu equ 3ch zhon equ 3eh maicho equ 3fh jinweb equ 40h bhcs equ 41h dpan equ 42h fenchu equ 43h fencun equ 44h pand equ 45h fenmc equ 51h org 0000h ajmp main org 000bh ajmp st0 org 001bh ajmp st1 org 0100h main: mov limiw,00h mov miao,00h mov fenmi,00h mov fmiao,00h mov meter,00h mov fenzh,00h mov point,0bh mov shimi,00h mov shifn,00h mov jishk,00h mov zhond,00h mov zhodu,00h mov zhon,00h mov maicho,00h mov jinweb,03h mov bhcs,00h mov sp,6fh mov tmod,21h mov th0,3ch mov tl0,0b0h mov th1,9ch mov tl1,9ch setb ea setb et0 setb et1 mov p1,0aah acall xianshi qidong: jb ,qidong acall delay jb ,qidong mov sudu,03h clr clr setb tr1 start: jnb ,start acall delay jnb ,start mov sudu,07h setb tr0 mov jishk,01h call delaa call delaa call delaa call delaa call delaajiance: mov c, mov 22h,c mov c, mov 23h,c mov c, mov 24h,c mov c, mov 25h,c mov c, mov 26h,czhangai: jb 25h,stop jnb 22h,youzhuan jnb 23h,youzhuan jnb 24h,zuozhuan jnb 26h,zuozhuan ajmp jiancezuozhuan: clr clr mov sudu,05h acall delaa setb setb mov sudu,07h ajmp jianceyouzhuan: clr clr mov sudu,05h acall delaa setb setb mov sudu,07h ajmp jiance stop: acall delay jnb 25h,zhangai clr tr0 mov a,fenmi mov fenmc,a mov a,02h add a,fenmc mov fenmc,a here: cjne a,fenmi,here clr tr1 setb acall delaa setb ajmp $ st0: push acc push psw mov th0,3ch mov tl0,0b0h inc zhond mov a,0ah cjne a,zhond,out mov zhond,00h inc zhodu mov a,02h cjne a,zhodu,miepo mov point,0bh mov zhodu,00h inc miao mov a,0ah cjne a,miao,out mov miao,00h inc fmiao mov a,06h cjne a,fmiao,out mov fmiao,00h inc fenzh mov a,0ah cjne a,fenzh,out mov fenzh,00h inc shifn out: call xianshi outb: pop psw pop acc reti miepo: mov point,0ah ajmp out st1: push acc push psw inc zhon mov a,sudu cjne a,zhon,hig setb ajmp outi hig: mov a,0ah cjne a,zhon,outi mov zhon,00h clr outi: mov a,01h cjne a,jishk,outb jb ,gao mov c, mov 21h,c orl c,20h clr 20h jc youbh ajmp outb gao: setb 20h ajmp outb youbh: inc maicho mov a,jinweb cjne a,maicho,outb mov maicho,00h inc bhcs mov a,02h cjne a,bhcs,jici mov jinweb,03h goon:inc limiw mov a,0ah cjne a,limiw,out mov limiw,00h inc fenmi cjne a,fenmi,out mov fenmi,00h inc meter cjne a,meter,out mov meter,00h inc shimi ajmp out jici: mov jinweb,02h ajmp goonxianshi: mov p1,0aah mov p1,0cch mov a,limiw swap a add a,miao mov p1,a nop nop mov p1,0ddh mov a,fenmi swap a add a,fmiao mov p1,a nop nop mov p1,0eeh mov a,0b0h add a,point mov p1,a nop nop mov p1,0eeh mov a,meter swap a add a,fenzh mov p1,a nop nop mov p1,0ffh mov a,shimi swap a add a,shifn mov p1,a ret delay: mov 46h,0ffh mov 47h,0ffh i:djnz 47h,i1 i1:djnz 46h,i ret delaa: mov 48h,0ah ii:mov 49h,0afh ii2:mov 50h,0ffh ii3:djnz 50h,ii3 djnz 49h,ii2 djnz 48h,ii ret附錄B 硬件原理