m8texterninterrupt07132026.asm

;; (c) david vajda
;; 07/13/2026
;; externes intervall

.include "m8def.inc"

.org 0x0000
rjmp RESET
.org INT0addr
rjmp INT0hndlr
.org INT1addr
rjmp INT1hndlr

RESET:
ldi r16, HIGH (RAMEND)
out SPH, r16
ldi r16, LOW (RAMEND)
out SPL, r16
ldi r16, 0xff
out DDRB, r16

ldi r16, (1 << ISC11) | (1 << ISC10) | (1 << ISC01) | (1 << ISC00)
out MCUCR, r16

ldi r16, (1 << INT1) | (1 << INT0)
out GICR, r16

ldi r16, 0xff
main001: rjmp main001

INT0hndlr:
dec r16
out PORTB, r16
reti

INT1hndlr:
inc r16
out PORTB, r16
reti