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);
}
}