Frequency_setting: process(SMCLK, RESET)

    begin

        if RESET = '1' then
        time_counter <= "0000000000000000000000";
        shift_counter <= "00000000";

        elsif SMCLK'event and SMCLK = '1' then
        shift_counter <=  shift_counter + "1";

        if shift_counter(7 downto 0) = "11111111" then
            shift_counter <= "00000000";
            flag_8b <= '1';
        else
            flag_8b <= '0';
        end if;

            if  flag_half_sec = '0' then
                time_counter <= time_counter + "1";

            if time_counter(21 downto 0) = "1111111111111111111111" then
                        flag_half_sec <= '1';
                    else
                        flag_half_sec <= '0';
                    end if;
                end if;
            end if;

    end process Frequency_setting;