.include "tn45def.inc"
.def temp = R16
.cseg
.org 0
rjmp reset

delay:
   ldi temp, 0       ; 1 cycle
   delayloop:
      dec temp       ; 1 cycle
      brne delayloop ; 2 cycles when true, 1 cycle when false
   ret               ; 4 cycles

reset:
   sbi DDRB, PB2
   loop:
      sbi PORTB, PB2 ; 2 cycles
      rcall delay    ; 3 cycles
      cbi PORTB, PB2 ; 2 cycles
      rcall delay    ; 3 cycles
      rjmp loop      ; 2 cycles