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외부 인터럽트 8개(INT0~INT7) 사용 할 때의 샘플코드입니다.
 
// AVRStuduio용 
#include <avr/io.h>
#include <avr/interrupt.h>
//
volatile unsigned char a=0;
//
ISR(INT0_vect){ a^=0x01; }
ISR(INT1_vect){ a^=0x02; }
ISR(INT2_vect){ a^=0x04; }
ISR(INT3_vect){ a^=0x08; }
ISR(INT4_vect){ a^=0x10; }
ISR(INT5_vect){ a^=0x20; }
ISR(INT6_vect){ a^=0x40; }
ISR(INT7_vect){ a^=0x80; }
//
int main(){ 
    DDRA=0xFF;  PORTD=0x0F; PORTE=0xF0;
    EICRA=0xAA; EICRB=0xAA; EIFR=0xFF; EIMSK=0xFF;
    SREG=0x80;
    while(1){
        PORTA=a;
    }
}
 
//-------------------
//코드비젼용 
#include <mega128.h>
//
unsigned char a=0;
//
interrupt [EXT_INT0] void ext_int0_isr(void){ a^=0x01; }
interrupt [EXT_INT1] void ext_int1_isr(void){ a^=0x02; }
interrupt [EXT_INT2] void ext_int2_isr(void){ a^=0x04; }
interrupt [EXT_INT3] void ext_int3_isr(void){ a^=0x08; }
interrupt [EXT_INT4] void ext_int4_isr(void){ a^=0x10; }
interrupt [EXT_INT5] void ext_int5_isr(void){ a^=0x20; }
interrupt [EXT_INT6] void ext_int6_isr(void){ a^=0x40; }
interrupt [EXT_INT7] void ext_int7_isr(void){ a^=0x80; }
//
void main(){ 
    DDRA=0xFF;  PORTD=0x0F; PORTE=0xF0;
    EICRA=0xAA; EICRB=0xAA; EIFR=0xFF; EIMSK=0xFF;
    SREG=0x80;
    while(1){
        PORTA=a;
    }
}
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