#include //Definition 51 special function register

sbit led=P1^0;

void delay( ) //Delay 0.2 second function

{

int i;

for(i=0;i<=30000;i++); //For loop 30000 times

}

void main( ) //Main function

{

void delay( ); //Declare delay function

led=0; //LED extinguish

while(1) //while loop

{

led=-led; //LED light up

delay( ); //Call delay function

}}