lcd计数显示程序

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

use IEEE.STD_LOGIC_ARITH.ALL;

use IEEE.STD_LOGIC_UNSIGNED.ALL;

---- Uncomment the following library declaraTIon if instanTIaTIng

---- any Xilinx primiTIves in this code.

--library UNISIM;

--use UNISIM.VComponents.all;

entity counter is

    Port ( clk : in std_logic;

     resetn : in std_logic;

           dout : out std_logic_vector(7 downto 0);

           lcd_en : out std_logic;

           lcd_rs : out std_logic;

           lcd_rw   : out std_logic);

end counter;