#define uchar unsigned char
uchar num;
sbit p10=P1^0;
void t0isr() interrupt 3
{
num++;
if(num>=100)
num=0;
p10=~p10;
}
main()
TMOD=0x20;
TH1=6;
TL1=6;
TR1=1;
ET1=1;
EA=1;
while(1);