51定时器和外部中断

#define uint unsigned int
#define uchar unsigned char
sbit p2_0=P2^0;
sbit p2_2=P2^1;
sbit p2_4=P2^2;
uchar num=11;
uchar tt=0;
uchar bai,shi,ge,bai1,num1;
uchar code table[]=
{~0x3f,~0x06,~0x5b,~0x4f,
~0x66,~0x6d,~0x7d,~0x07,
~0x7f,~0x6f,~0x77,~0x7c,
~0x39,~0x5e,~0x79,~0x71};
void delay(uint z);
void main()
{
TMOD=0x01;//设置定时方式
TH0=(65536-50000)/256;//计算定时时间
TL0=(65536-50000)%6;
EA=1;// 开总中断
EX0=1;
IT0=1;
ET0=1; //
TR0=1; //开启0定时器
p2_0=1;
p2_4=1;
p2_2=1;

while(1)

//if(tt==120)

//{tt=0;

//num=10;

//}







//num=12;
shi=num/10;
ge=num;
p2_0=0;
P0=table[shi];
delay(14);
p2_0=1;
p2_2=0;
P0=table[ge];
delay(14);
p2_2=1;


}

void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
void ds() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%6;
tt++;


}
//void zd() interrupt 0
//{
// num++ ;
//}