.INCLUDE "m8def.inc" .DEF mp = R16 rjmp main main: ldi mp,0b11111111 out DDRB,mp out DDRC,mp out DDRD,mp loop: ldi mp,0x00 out PORTB,mp out PORTC,mp out PORTD,mp ldi mp,0xFF out PORTB,mp out PORTC,mp out PORTD,mp rjmp loop