89C52单片机制作秒表

1. 动态显示

2. 七段译码的编码表

3. 定时器的设置

单片机的时钟信号为11.0592MHz，选取46080对应0.05s。

程序：

#include#include  sbit P2_2=P2^2 ;sbit P2_3=P2^3 ;void delay(unsigned char dly){  unsigned char i,j;   for(i=255;i>0;i--)    for(j=dly;j>0;j--);}unsigned char num,time;void  timer0()interrupt 1{  TH0=(65535-46080)/256;   TL0=(65535-46080)% 256;  num++;  if(num==20)    { num=0; time++;}}void intial(){   TMOD=0x01;   ET0=1;   EA=1;   TR0=1;   num=0;}void main(){  unsigned char table[]={0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90};  unsigned char shi,fen;  intial();  while(1)    { if(time==60)   time=0; shi=time/10; fen=time% 10; P2_2=1; P2_3=0; P0=table[shi]; delay(2); P2_2=0; P2_3=1; P0=table[fen]; delay(2);}}