project source code to blink led

//program to blink the led LED1
//Target board s/n 102011
//Manufacturer Technophilia

#include "reg51.h"   //header file for 8051 series of micro controller modified
#include "delay.h" //header file for generating time delay
void main()
 {
  while(1)
   {
    p20=1; //on the LED1
delay(1000); //give a time delay of 1000 mili second or 1 second for LED to on
p20=0; //off the LED1
delay(1000);    //give a time delay of 1000 mili second or 1 second for LED to off
   }
 }