sbit beep=P2^3;

void delay(){
unsigned int j,k;
for(j=0;j<100;j++) {}
for(k=0;k<25500;k++) {}
}

void main()
{
unsigned char h1;
h1=0x01;
while(1){
delay();
beep=1;
delay();
h1=_crol_(h1,1);
P1=h1;
beep=0;
delay();
 }
}