Program

#include <inttypes.h>
#include <avr/io.h>
#include <avr/iom168.h>
#include <avr/interrupt.h>
#include <avr/sleep.h>

/* FUSE bity:
 * HF = 1 1 0 1  1 0 0 1     0xD9 (default)
 *      1 1 0 0  1 0 0 1     0xC9
 * LF = 1 1 1 0  0 0 0 1     0xE1 (default)
 *      1 1 1 0  0 1 1 1     0xE7
 *
 * read      avrdude -p atmega168 -P usb -c usbasp    -U lfuse:r:"low.bin":r -U hfuse:r:"high.bin":r
 * write     avrdude -p atmega168 -P usb -c usbasp    -U lfuse:w:"low.bin":r -U hfuse:w:"high.bin":r
 * fuseswrite     avrdude -p atmega168 -P usb -c usbasp -B 200 -U lfuse:w:0xE7:m
 */

#define OSCFREQ 12000000L

int main (void){

    while(1)
    {
    }

    return 0;
}