mkleemann

/* ATmega8 with internal 4Mhz clock (6cycle + 64ms) */

#include <avr/io.h>
#include <avr/sleep.h>
#include <avr/interrupt.h>
#include <util/delay.h>

int main(void)
{
   DDRC |= (1 << PC2) | (1 << PC1);     // leds for testing

mkleemann

// All values/comments are valid with ATmega8 running at Fosc = 4.000MHz

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

// TIMER0 with prescaler clkI/O/1024
#define TIMER0_PRESCALER      (1 << CS02) | (1 << CS00)


void main()

mkleemann

// All values/comments are valid with ATmega8 running at Fosc = 4.000MHz

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

// TIMER1 with prescaler clkI/O/1024
#define TIMER1_PRESCALER      (1 << CS12) | (1 << CS10)

// ~15s (4MHz@1024 prescale value)
#define TIMER1_COMPARE_VALUE  0xE4E1

mkleemann

// All values/comments are valid with ATmega8 running at Fosc = 4.000MHz

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

// TIMER2 with prescaler clkT2S/1024
#define TIMER2_PRESCALER      (1 << CS22) | (1 << CS21) | (1 << CS20)

// TIMER2 output compare value
// --> value 98 is 25.088ms (4MHz@1024 prescale factor)