TinyBlinkV2

.NOLIST
#ifndef _TN13DEF_INC_
  .include "tn13def.inc"
#endif

;.include "regs.inc"

;timers
.equ CLK1024 = (1<<CS00) | (1<<CS02)

;ticks
.equ T0MAXTICK = 2

;work
.def t0tick = R22
.def state = R21

.org 0
  rjmp reset

.org 0x0003
  rjmp TIM0_OVF


.macro outi
  push R16
  ldi    r16, @1
  out    @0, r16
  pop R16
.endm

;==============================================================
.macro show
  push R17

  OUTI PORTB, 1


;  mov R17, state
;  dec R17

;  breq PC+3
;  OUTI PORTB, (1 << 0)
;  rjmp m1
;  OUTI PORTB, (0 << 0)

;  m1:

  pop R17
.endm


;==============================================================
;ISR
TIM0_OVF:

  OUTI PORTB, 1

  dec t0tick
  breq PC+2
  reti
  push R17
  ldi R17, 1
  eor state, R17
  ldi t0tick, T0MAXTICK
  pop R17
  reti

;==============================================================

reset:
  ;RAM stack
    ldi R17, low(RAMEND)
    OUT SPL, R17

  ;PORTS
    OUTI DDRB, 0xFF
    OUTI PORTB, 0

  outi COM0A1, 1
  outi COM0A0, 0

  ;timers
    ;outi tccr0a, 0b10100011      ; режим fast pwm
    ;COM00, 0
    ;COM01, 0
    ;WGM0, 0
    ;WGM1, 0
    ;WGM2, 0

    outi TCNT0, 0b0000101      ; делитель на 1024
    ;outi gtccr, 0b00000001        ; сброс предделителя
  ;OUTI TCCR0A, 8

  ;init
    ldi state, 1
    ldi t0tick, T0MAXTICK

    sei

;==============================================================
main:
  ;show
  breq main