AVR ExampleT1int.c

#include <avr/io.h>
#include <avr/interrupt.h>


//  if ( (TIFR1 & 0x01) == 0x01)  // If the overflow flag is set
//  ... then following Interrupt routine is called

ISR (TIMER1_OVF_vect)          
 { 
	   PORTB = PORTB ^ 0b????????; // Toggle the LED
           TCNT1 = 0x????;             // Restart T/C1 - reload
	// Following is not necessary as it is cleared automatically
        // TIFR1 = 0x01;               // Clear the overflow flag
  }
      
int main( void )
{
  /* *********************** Init device ************************************ */

  ...

// Enable interrupts:

  TIMSK1 = 0x01;            // Timer 1 overflow interrupt enable
   sei();                   // Assembler macro for global int. enable


  /* *********************** Main Loop ************************************** */

  do {

        asm("nop");                 // Do nothing

  } while(1);                       // And do this forever


 return(0);
}

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