#include"reg51.h"

sbit spk=P3^4;

void delay(unsigned int);

main(){

while(1){

spk=1;

delay(1);

spk=0;

delay(1);

}

}

void delay(unsigned int t){

int i,j;

for(i=0;i

for(j=0;j<200;j++){ p="">

}

}

}