Blinking of led.....

This ckt explains about the ckt configuration. This ckt in which led blink will glow for 5 sec and remain off for another 5 sec.
The embedded C code for atmega 8 is as follows....

 #define F_CPU 1000000UL  // define the working frequency of atmega 8
 #include <avr/io.h>      // include avr files
 #include <util/delay.h>  // include header file for delay

//Function that defines the delay
//delayms(1000) - 1 sec delay

void delayms(uint16_t millis) {
  while ( millis ) {
    _delay_ms(1);
    millis--;
  }
}

// main program starts from here
int main(void) {
  DDRC = 0xFF;   // defines that C pORT will act as o/P port.
                 // if DDRC=0x00 ,then PORT C will act as I/P port.
  PORTC=0x00;    // initial declaration of PORT C
  while(1) {

    PORTC = 0x00;
    delayms(5000);  // delay for 5 sec

    PORTC = 0xFF;
    delayms(5000);
  }
  return 0;
}