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#include<reg52.h>
unsigned char a,num;
sbit LED1=P1^3;
void main()
{
num=0;
EA=1;
ET0=1;
TMOD=0x01;
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
TR0=1;
while(1)
{
if(num==20)
{
num=0;
LED1=~LED1;
}
}
}
void time0() interrupt 1
{
TH0=(65536-50000)/256;
TL0=(65536-50000)%256;
num++;
}
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