求各位前辈指导 51单片机时钟问题

只看该作者 · 2013-6-6 21:59

#include<AT89X51.h>
#define uchar unsigned char
uchar code table[]={0xc0,0xf9,0xc4,0xb0,0x99
,0x92,0x82,0xf8,0x80,0x90}; //共阳数码管
uchar time,num,hour,min,sec;
void delay(uchar x)
{
TMOD=0x01;
TR0=1;
while(x--)
{
  TH0=0x1c;
  TL0=0x18;
  while(!TF);
  TF0=0;
  time++;
}
TR0=0;
}
void write(uchar num,chose)
{
uchar i;

for(i=0;i<2;i++)
{
   P0=0xff;
   P2=~chose;//位选

   if(i==0)
   {
      P0=table[num%10];//段选
   }
   else
      P0=table[num/10];//段选

   chose=chose<<1;
   delay(5);
}
}
void display()
{
P0=0xff;
P2=0xdb;
P0=0xbf;
delay(5);
}//-隔开时，分，秒显示
void time_add()
{
if(time==1000)
{
sec++;
if(sec==60)
   {
   sec=0;
   min++;
   if(min==60)
      {
         min=0;
         hour++;
         if(hour==24)
            {
            hour=0;
         }
      }
   }
}
}
void main()
{
hour=23;
min=37;
sec=50;
while(1)
{
  write(sec,0x01);
  write(min,0x08);
  write(hour,0x40);
  display();
  time_add();
}
}