@startuml
start

:posedge clk;

'--- Step timer ---
if (step_cnt >= (freq_idx == 1 ? STEP_2SEC_MAX : STEP_4SEC_MAX)) then (yes)
  :step_cnt := 0;
  if (freq_idx == 5) then (yes)
    :freq_idx := 0;
  else (no)
    :freq_idx := freq_idx + 1;
  endif
else (no)
  :step_cnt := step_cnt + 1;
endif

'--- Recalculate half-period ---
:max_count := calc_max_count(freq_idx);

'--- Blink generation for led ---
if (max_count == 0) then (0 Hz)
  :blink_cnt := 0;
  note right
    led_base сохраняет предыдущее
    значение (нет мигания)
  end note
else (f > 0)
  if (blink_cnt >= max_count) then (toggle)
    :blink_cnt := 0;
    :led_base := ~led_base;
  else (count)
    :blink_cnt := blink_cnt + 1;
  endif
endif

'--- 1 Hz generation for pin ---
if (pin_cnt >= PIN_1HZ_HALF_MAX) then (toggle)
  :pin_cnt := 0;
  :pin_base := ~pin_base;
else (count)
  :pin_cnt := pin_cnt + 1;
endif

'--- Outputs (combinational) ---
:led    = ~led_base;
:pin    = pin_base;
:pin_10 = led;

stop
@enduml