#define F_CPU 1000000UL
#define CLK PINB2
#include <avr/eeprom.h>
#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>


ISR(EXT_INT0_vect)
{

PORTA|=_BV(PORTA1);
}

int main(void)
{
//init
cli();
DDRA=0b00000111;
PORTA=0x00;
DDRB=0x00;
PORTB=0b0001100;
// MCUCR|=_BV(1); //Setting INT0 to falling edge interrupt
MCUCR|=1<<ISC01 | 1<<ISC00;
GIMSK|=(1<<INT0); //enable INT0 interrupt
//endinit
sei();
while(1)
{
// if (PINB&(1<<CLK))
{
PORTA|=_BV(PORTA0);
PORTA&=~_BV(PORTA0);
}
}
}

/*******************************************************
This program was created by the
CodeWizardAVR V2.60 Evaluation
Automatic Program Generator
*******************************************************/

#include <tiny44.h>

// Declare your global variables here

// External Interrupt 0 service routine
interrupt [EXT_INT0] void ext_int0_isr(void)
{
// Place your code here

}

void main(void)
{
// Declare your local variables here

// Crystal Oscillator division factor: 1
#pragma optsize-
CLKPR=(1<<CLKPCE);
CLKPR=(0<<CLKPCE) | (0<<CLKPS3) | (0<<CLKPS2) | (0<<CLKPS1) | (0<<CLKPS0);
#ifdef _OPTIMIZE_SIZE_
#pragma optsize+
#endif

// Input/Output Ports initialization
// Port A initialization
// Function: Bit7=In Bit6=In Bit5=In Bit4=In Bit3=In Bit2=In Bit1=In Bit0=In
DDRA=(0<<DDA7) | (0<<DDA6) | (0<<DDA5) | (0<<DDA4) | (0<<DDA3) | (0<<DDA2) | (0<<DDA1) | (0<<DDA0);
// State: Bit7=T Bit6=T Bit5=T Bit4=T Bit3=T Bit2=T Bit1=T Bit0=T
PORTA=(0<<PORTA7) | (0<<PORTA6) | (0<<PORTA5) | (0<<PORTA4) | (0<<PORTA3) | (0<<PORTA2) | (0<<PORTA1) | (0<<PORTA0);

// Port B initialization
// Function: Bit3=In Bit2=In Bit1=In Bit0=In
DDRB=(0<<DDB3) | (0<<DDB2) | (0<<DDB1) | (0<<DDB0);
// State: Bit3=T Bit2=T Bit1=T Bit0=T
PORTB=(0<<PORTB3) | (0<<PORTB2) | (0<<PORTB1) | (0<<PORTB0);

// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
// Mode: Normal top=0xFF
// OC0A output: Disconnected
// OC0B output: Disconnected
TCCR0A=(0<<COM0A1) | (0<<COM0A0) | (0<<COM0B1) | (0<<COM0B0) | (0<<WGM01) | (0<<WGM00);
TCCR0B=(0<<WGM02) | (0<<CS02) | (0<<CS01) | (0<<CS00);
TCNT0=0x00;
OCR0A=0x00;
OCR0B=0x00;

// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Disconnected
// OC1B output: Disconnected
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=(0<<COM1A1) | (0<<COM1A0) | (0<<COM1B1) | (0<<COM1B0) | (0<<WGM11) | (0<<WGM10);
TCCR1B=(0<<ICNC1) | (0<<ICES1) | (0<<WGM13) | (0<<WGM12) | (0<<CS12) | (0<<CS11) | (0<<CS10);
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;

// Timer/Counter 0 Interrupt(s) initialization
TIMSK0=(0<<OCIE0B) | (0<<OCIE0A) | (0<<TOIE0);

// Timer/Counter 1 Interrupt(s) initialization
TIMSK1=(0<<ICIE1) | (0<<OCIE1B) | (0<<OCIE1A) | (0<<TOIE1);

// External Interrupt(s) initialization
// INT0: On
// INT0 Mode: Falling Edge
// Interrupt on any change on pins PCINT0-7: Off
// Interrupt on any change on pins PCINT8-11: Off
MCUCR=(1<<ISC01) | (0<<ISC00);
GIMSK=(1<<INT0) | (0<<PCIE1) | (0<<PCIE0);
GIFR=(1<<INTF0) | (0<<PCIF1) | (0<<PCIF0);

// USI initialization
// Mode: Disabled
// Clock source: Register & Counter=no clk.
// USI Counter Overflow Interrupt: Off
USICR=(0<<USISIE) | (0<<USIOIE) | (0<<USIWM1) | (0<<USIWM0) | (0<<USICS1) | (0<<USICS0) | (0<<USICLK) | (0<<USITC);

// Analog Comparator initialization
// Analog Comparator: Off
ACSR=(1<<ACD) | (0<<ACBG) | (0<<ACO) | (0<<ACI) | (0<<ACIE) | (0<<ACIC) | (0<<ACIS1) | (0<<ACIS0);
ADCSRB=(0<<ACME);
DIDR0=0x00;

// ADC initialization
// ADC disabled
ADCSRA=(0<<ADEN) | (0<<ADSC) | (0<<ADATE) | (0<<ADIF) | (0<<ADIE) | (0<<ADPS2) | (0<<ADPS1) | (0<<ADPS0);


// Global enable interrupts
#asm("sei")

while (1)
      {
      // Place your code here

      }
}