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#include <avr/io.h>
.section .text ; denotes code section
.global __vector_1 ; INT0_vect
__vector_1:
INC R1
STS PORTB, R1
RETI
.global main
main:
LDI R16, 255
STS DDRB, R16 ; port B as output
LDI R16, 0b11111011
STS DDRD, R16 ; only pin PD2 as input
COM R16 ; enable Pull-up only on PD2, INT0
STS PORTD, R16
LDI R16, 2 ; make INT0 trigger on falling edge
STS MCUCR, R16
LDI R16, 0x40 ; enable INT0 enable bit of GICR
STS GICR, R16
CLR R1
SEI ; enable interrupts
loop: ; infinite wait loop
RJMP loop
.end
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