task decrement_time;
begin
  prescaler <= prescaler + 1;
  if (prescaler == 26'd49999999)
  begin
    prescaler <= 0;
    secs <= secs - 1;
    if (secs < 1)
    begin
      secs <= 9;
      ten_secs <= ten_secs - 1;
      if (ten_secs < 1)
      begin
        ten_secs <= 5;
        mins <= mins - 1;
      end
    end
  end
end
endtask