51单片机入门——捕获（内部中断）

ID:65608 · 发表于 2014-9-12 01:01

#include<reg52.h>
#define uchar unsigned char
#define uint unsigned int
uchar shi,ge,a,b;
uint num ;
sbit dula=P2^6;
sbit wela=P2^7;
uchar code table[]=
{
  0x3f,0x06,0x5b,0x4f,
  0x66,0x6d,0x7d,0x07,
  0x7f,0x6f,0x77,0x7c,
  0x39,0x5e,0x79,0x71
};
void delayms(uint);
void display(uchar shi,uchar ge)
{
  dula=1;
  P0=table[shi];
  dula=0;
  P0=0xff;
  wela=1;
  P0=0xfe;
  wela=0;
  delayms(5);
  dula=1;
  P0=table[ge] ;
  dula=0;
  P0=0xff;
  wela=1;
  P0=0xfd;
  wela=0;
  delayms(5);
}
void delayms(uint xms)
{
uint i,j;
for(i=xms;i>0;i--)
   for(j=110;j>0;j--);
}
uint read()
{
uchar t1,th1,th2;
uint val;
while(1)
{
   th1=TH0;
t1=TL0;
th2=TH0;
if(th1==th2)
   break;
}
val=th1*256+t1;
return val;
}
void main()
{ TMOD=0x01;
TH0=(65536-45872)/256;
TL0=(65536-45872)%6;
EA=1;
ET0=1;
TR0=1;
while(1)
{
   display(a,b);
}
}
  void T1_time()interrupt 1
{
TH0=(65536-45872)/256;
TL0=(65536-45872)%6;
num=read();
if(num==99)
{
   num=0;
}

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