Estoy usando la placa FPGA Spartan 2 y quiero contar las teclas presionadas desde el teclado, este es mi código VHDL:

library ieee ;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
use ieee.numeric_std.all;

ENTITY Keyboard IS
 PORT(CLOCK : IN STD_LOGIC;
      RESET : IN STD_LOGIC;
      RK : IN STD_LOGIC_VECTOR(3 DOWNTO 1);
      DE : OUT STD_LOGIC_VECTOR(3 DOWNTO 1);
      Invalid_Key : OUT STD_LOGIC := '0';
      Seg1 : OUT STD_LOGIC_VECTOR(7 Downto 0);
      Seg2 : OUT STD_LOGIC_VECTOR(7 Downto 0);
      LEDRow1 : OUT STD_LOGIC_VECTOR(7 Downto 0);
      LEDRow2 : OUT STD_LOGIC_VECTOR(7 Downto 0);       
      Key : OUT STD_LOGIC_VECTOR(0 TO 15));
END Keyboard;

Architecture Behavier OF Keyboard IS
 Signal CLK : STD_LOGIC_VECTOR(23 DOWNTO 0);
 Signal KC : STD_LOGIC_VECTOR(1 DOWNTO 0);
 Signal KEY_PUSH : STD_LOGIC_VECTOR(4 DOWNTO 0);
 Signal KeyTemp : STD_LOGIC_VECTOR(1 TO 16) := "0000000000000000";
 Signal Counter : STD_LOGIC_VECTOR(4 downto 0) := "00000";
Begin
 DE(3) <= '0';
 DE(2 DOWNTO 1) <= KC;
 KEY_PUSH <= KC & RK;

 Process(KEY_PUSH)
 begin
  Case KEY_PUSH is
   WHEN "11101" => --0
    if Counter <= 15 then
      Invalid_Key <= '0';
      Counter <= Counter + 1;
     KeyTemp(conv_integer(Counter)) <= '0';           
    else
     Invalid_Key <= '1';
    end if;
   WHEN "00110" => --1
    if Counter <= 15 then
      Invalid_Key <= '0';
     Counter <= Counter + 1;
      KeyTemp(conv_integer(Counter)) <= '1';
    else
     Invalid_Key <= '1';
    end if;

   WHEN "00101" =>
    Invalid_Key <= '1';  -- 2
   WHEN "00011" =>
    Invalid_Key <= '1';  -- 3
   WHEN "01110" =>
    Invalid_Key <= '1';  -- 4
   WHEN "01101" =>
    Invalid_Key <= '1';  -- 5
   WHEN "01011" =>
    Invalid_Key <= '1';  -- 6
   WHEN "10110" =>
    Invalid_Key <= '1';  -- 7
   WHEN "10101" =>
    Invalid_Key <= '1';  -- 8
   WHEN "10011" =>
    Invalid_Key <= '1';  -- 9
   WHEN "11011" => -- #
    Invalid_Key <= '1';  -- #   

   WHEN "11110" => -- *
     Invalid_Key <= '0';
    KeyTemp <= "0000000000000000";
    Counter <= "00000";
   WHEN OTHERS =>   
    Invalid_Key <= '0';
  End Case;

   case Counter is
    when "00000" => -- 0
     Seg1 <= "00111111";
      Seg2 <= "00111111";
    when "00001" => -- 1
     Seg1 <= "00111111";
      Seg2 <= "00000110";
    when "00010" => -- 2
     Seg1 <= "00111111";
      Seg2 <= "01011011";
    when "00011" => -- 3
     Seg1 <= "00111111";
      Seg2 <= "01001111";
    when "00100" => -- 4
     Seg1 <= "00111111";
      Seg2 <= "01100110";
    when "00101" => -- 5
     Seg1 <= "00111111";
      Seg2 <= "01101101";
    when "00110" => -- 6
     Seg1 <= "00111111";
      Seg2 <= "01111101";
    when "00111" => -- 7
     Seg1 <= "00111111";
      Seg2 <= "00100111";
    when "01000" => -- 8
     Seg1 <= "00111111";
      Seg2 <= "01111111";
    when "01001" => -- 9
     Seg1 <= "00111111";
      Seg2 <= "01101111";
    when "01010" => -- 10
     Seg1 <= "00000110";
      Seg2 <= "00111111";
    when "01011" => -- 11
     Seg1 <= "00000110";
      Seg2 <= "00000110";
    when "01100" => -- 12
     Seg1 <= "00000110";
      Seg2 <= "01011011";
    when "01101" => -- 13
     Seg1 <= "00000110";
      Seg2 <= "01001111";
    when "01110" => -- 14
     Seg1 <= "00000110";
      Seg2 <= "01100110";
    when "01111" => -- 15
     Seg1 <= "00000110";
      Seg2 <= "01101101";
    when "10000" => -- 16
     Seg1 <= "00000110";
      Seg2 <= "01111101";
    when others =>
     Seg1 <= "00000000";
     Seg2 <= "00000000";      
   end case;

  LEDRow1 <= KeyTemp(1 to 8);
  LEDRow2 <= KeyTemp(9 to 16);  

  if Counter = 16 then
   Key <= KeyTemp;
  end if;
 End Process;

 Process(CLOCK, CLK)
 begin
  IF (Clock'EVENT AND Clock='1') THEN
   Clk <= Clk + 1;
  END IF;    
 end Process;   

 Process(Reset, CLK(10))
 begin
  IF RESET = '1' THEN
   KC <= "00";
  ELSIF (CLK(10) 'EVENT AND CLK(10)='1') THEN 
   KC <= KC + 1;    
  END IF;
 end Process;   
END Behavier;

solo se aceptan las teclas 1 y 0

Quiero mostrar el valor del contador en 2 7 segmentos y mostrar los 0 y 1 en dos líneas de LED Matrix, pero hay un problema en el contador, creo que el problema es "Key_PUSH" o "RK" que cambian muchas veces cuando presiono una tecla .

¿Cómo puedo crear un contador para las teclas presionadas?