原理图:源程序:/＊*＊*＊＊＊＊＊＊＊＊*＊**＊＊＊＊＊＊*＊＊*＊＊＊＊*＊＊＊***＊＊＊＊＊＊**＊＊*****＊＊＊*＊＊＊＊*标题：ﻩ定时器中断 精确到 00、0 １得秒表效果:能清零重新开始，暂停,继续计时,能精确到０、０ 1 秒作者： 皖绩小挺说明：ﻩ使用１ 2M 晶振，四位数码管，3 个按键***＊＊＊*＊＊*＊＊****＊****＊＊＊*＊*****＊＊＊＊*＊**＊＊＊＊**＊＊*＊*＊*＊*＊**＊＊*＊＊*＊/＃ｉ nc ｌ ude〈ｒｅ g52、h〉#ｄ efine ｕ int un ｓ ign ｅｄ int#ｄｅ f ｉ n ｅ uc ｈａ r u ｎｓ ig ｎ e ｄ charu ｉ nt temp,ｔ t,qian，bai，s ｈ i，ge；ｓ bit sm ｇ＿q=P1＾0;sbi ｔ s ｍ g＿b=P1^1;sbit s ｍｇ_s=Ｐ１^２；sbit smg_ｇ=P1^３;sbit k ｅｙ 1 = P3^７；ﻩsb ｉ t key2 ＝ Ｐ 3^6；sbit ｋ ey3 ＝ P ３＾5;uchar ｃ o ｄ e table[]={０ xc ０，０ｘ f ９，0xa ４,0 ｘ b0,0x ９ 9, ﻩﻩ0x9 ２，0 ｘ 82，0xf ８，0x80，0x9 ０｝；u ｃｈ ar ｃ o ｄ e t ａ ble1［］={0x ４０,０ x ７ 9,0x24，0x ３ 0，0x19, ﻩ0ｘ 12,0 ｘ 0 ２,0x ７８，0x ０ 0,0 ｘ 10}；／/带小数点void ｋ eysc ａｎ(）；ｖｏｉ d ｄ isplay（u ｉ nt ｓ h ｉ，u ｉ nt ge）；voi ｄ ｄ elay（ｕ int z）;ｖｏ id ｉ ni ｔ(）;/＊***＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊＊*＊＊＊＊***＊*＊＊＊*＊＊＊***＊＊**＊＊*＊＊＊**＊**＊*＊*主函数＊＊＊＊＊＊＊*＊*＊*＊＊＊＊*＊＊＊***＊＊*＊＊**＊**＊＊*＊＊＊＊＊＊＊＊＊＊*＊＊＊＊*＊＊＊＊*＊＊＊***＊*＊／void main(）｛ﻩinit（）；／/初始化子程序w ｈ ile（1）ﻩ｛ﻩi ｆ（tt＝=1）ﻩ ｛ﻩﻩﻩtt＝０;ﻩtemp＋+;ﻩﻩi ｆ(ｔ em ｐ==１ 000 ０) {ﻩﻩt ｅ mp=0;ﻩﻩ ｝ﻩｑ ia ｎ=t ｅ mp/1000;ﻩbai=ｔ e ｍｐ%１ 000/１ 00；ﻩshi=te ｍ p%１ 0 ０/1 ０;ﻩｇ e=tem ｐ%１ 0；ﻩﻩ ｝ ke ｙ sca ｎ（)； ﻩdi ｓ p ｌａ y（shi,ge）;}}／＊＊*＊＊*＊＊＊＊＊**＊****＊**＊*＊＊*＊＊**＊＊＊*＊＊＊*＊*＊*＊*＊**＊**＊＊＊＊***＊＊*＊＊＊＊*＊＊*＊ﻩﻩﻩ延时****＊＊＊***＊＊＊**＊***＊***＊＊＊*＊＊＊＊＊*＊****＊＊＊＊*＊*＊＊＊＊****＊＊*＊*＊＊*＊**＊＊＊＊*＊*/voi ｄ delay...
