单片机制作简易定时器

系统图：

程序：

#include
unsigned char code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,
0x80,0x90};
unsigned char count;
unsigned char second,temp;
bit alarmflag;
void delay(unsigned int i)
{ unsigned char j;
  while(i--)for(j=248;j>0;j--);
}
void main()
{
 TMOD=0x22;
 TH0=0x06;
 TL0=0x06;
 TH1=0x06;
 TL1=0x06;
 TR1=1;
 ET1=1;
 EA=1;
 ET0=1;
 P1=table[count/10];
 P0=table[count%10];
 while(1)
     {
      if(P3_2==0)
         {
           delay(20);
           if(P3_2==0)
             {
               count++;
               if(count==60){count=0;}
               P1=table[count/10];
               P0=table[count%10];
             }
           while(P3_2==0);temp=count;
         }
       else if(P3_3==0)
              {
                delay(20);
                if(P3_3==0)
                  {
                    TR0=1;
                  }
              }
     }
}
void time0() interrupt 1
{
  static unsigned int nn;
  nn++;
  if(nn==4000)
     {
      second=count--;
      P0=table[second%10];P1=table[second/10];
      if(second<=0){second=0;}
     }
}
void time1() interrupt 3
{
  static unsigned int kk,ll,pp;
  kk++;
  if(kk==4000)
     {temp=count;
      ll++;
      if(ll==temp)
         {ll=0;P2_1=0;
         }
       pp++;
       if(pp==6)
      {P0=table[0xc0];P1=table[0xc0];P2_1=1;pp=0;}
     }
}