1、.原理圖：源程序：/*標(biāo)題：定時(shí)器中斷 精確到00.01的秒表效果：能清零重新開(kāi)始，暫停，繼續(xù)計(jì)時(shí)，能精確到0.01秒作者： 皖績(jī)小挺說(shuō)明：使用12m晶振,四位數(shù)碼管，3個(gè)按鍵*/#include#define uint unsigned int#define uchar unsigned charuint temp,tt,qian,bai,shi,ge;sbit smg_q=p10;sbit smg_b=p11;sbit smg_s=p12;sbit smg_g=p13;sbit key1 = p37;sbit key2 = p36;sbit key3 = p35;uchar code ta

2、ble=0xc0,0xf9,0xa4,0xb0,0x99, 0x92,0x82,0xf8,0x80,0x90;精品.uchar code table1=0x40,0x79,0x24,0x30,0x19, 0x12,0x02,0x78,0x00,0x10;/帶小數(shù)點(diǎn)void keyscan();void display(uint shi,uint ge);void delay(uint z);void init();/*主函數(shù)*/void main()init();/初始化子程序while(1)if(tt=1) tt=0;temp+;if(temp=10000) temp=0; qian=tem

3、p/1000;bai=temp%1000/100;shi=temp%100/10;ge=temp%10; keyscan(); display(shi,ge);/*延時(shí)*/void delay(uint z)uint x,y;for(x=z;x0;x-)for(y=110;y0;y-);/*精品.按鍵控制*/void keyscan()if(key1=0) /清零并重新開(kāi)始計(jì)時(shí)temp=0;tr0=1;if(key2=0) /暫停計(jì)時(shí)tr0=0;if(key3=0) /繼續(xù)計(jì)時(shí)tr0=1; /*顯示*/void display(uint shi,uint ge) smg_q=0;p0=tabl

4、eqian;delay(1);smg_q=1;p0=0xff;smg_b=0;p0=table1bai;delay(1);smg_b=1;p0=0xff;smg_s=0;p0=tableshi;delay(1);smg_s=1;p0=0xff;smg_g=0;p0=tablege;精品.delay(1);smg_g=1;p0=0xff;/*初始化*/void init()smg_q=1;smg_b=1;smg_s=1;smg_g=1;temp=0;tmod=0x01;th0=(65536-10000)/256;tl0=(65536-10000)%256;ea=1;et0=1;tr0=1;/*中斷*/void t0() interrupt 1th0=(6