Understanding a counter

[Altera_Forum]

I want to understand this code. Can anyone tell help me, how does it work? 

 library IEEE; use IEEE.STD_LOGIC_1164.ALL; use ieee.numeric_std.all; use ieee.std_logic_arith.all;-- Uncomment the following library declaration if using-- arithmetic functions with Signed or Unsigned values--use  IEEE.NUMERIC_STD.ALL;-- Uncomment the following library declaration if instantiating-- any Xilinx primitives in this code.--library UNISIM;--use UNISIM.VComponents.all; entity leds2_8 is GENERIC (n: positive := 2**22);    Port ( clkin : in STD_LOGIC;  clkout : out STD_LOGIC;  leds : out STD_LOGIC_VECTOR (7 downto 0)); end leds2_8; architecture Behavioral of leds2_8 is begin PROCESS (clkin) VARIABLE count: INTEGER RANGE 0 to n; variable counter : integer range 0 to 255;  BEGIN IF(clkin'EVENT AND clkin='1') THEN count :=count + 1; IF(count=n/2) THEN clkout <='1'; ELSIF (count=n) THEN clkout <='0';  count :=0; counter :=counter+1; leds <=conv_std_logic_vector(counter,8); END IF; END IF; END PROCESS; end Behavioral;

[Altera_Forum]

you got two counters (count 0 ~ 2^22 and counter 0~255). 

count outputs clkout at n/2 and n (not exactly right, should be n/2-1 and n-1 due to zero start value), it counts clocks counter drives led output and is enabled when count is max  both counters can be free running as they are binary range(0~255,0~ 2^22-1) if you correct your range.