ATmega88 @ 8MHz 16

atmega88-16.c

/* code016.c ATmega88 @ 8MHz */
#include <avr/io.h>
#include <avr/interrupt.h>    // Einbinden von interrupt.h (Interrupt Funktionen)
#include <avr/wdt.h>      // Einbinden von wdt.h (Watchdog Funktionen)
 
uint8_t counter = 100;
 
int main(void)
{
    DDRD = 0xFF;
    PORTD = 0x00;
     
    wdt_reset();            // watchdog timer reset
    wdt_enable(WDTO_60MS);  // watchdog enable, time-out 60ms
    WDTCSR = (1<<WDIE);
    sei();                  // Interrupts aktivieren
     
    asm ("NOP");            // no operation
     
    while(1)
    {
        while (counter >= 0)
        {
            counter --;
            PORTD = (1<<PD7); // LED D7 ON
        }
        wdt_reset();            // watchdog timer reset
    }
}
 
ISR (WDT_vect)                  // ISR Watchdogtimer Overflow Interrupt
{
    PORTD |= (1<<PD6);            // LED D6 ON
    WDTCSR = (1<<WDIE);           // Watchdog Interrupt aktivieren
}