给出vhdl语言设计的代码要求在数码管上显示时分秒并且可以通过44的矩阵键盘手动设置时间使用10kHz的基础频率

我们为您提供一个基本的代码框架，其中包含了数字时钟的基本功能。请注意，此代码还需要进行一些调整和完善，以适应您的具体需求和硬件环境。

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

entity clock is
  port (
    clk : in std_logic;
    rst : in std_logic;
    keypad : in std_logic_vector(15 downto 0);
    seg : out std_logic_vector(6 downto 0);
    an : out std_logic_vector(3 downto 0)
  );
end entity;

architecture behavioral of clock is
  constant FREQ : integer := 10000; -- 10kHz
  constant COUNT_MAX : integer := FREQ - 1;

  signal count : integer range 0 to COUNT_MAX := 0;
  signal sec : integer range 0 to 59 := 0;
  signal min : integer range 0 to 59 := 0;
  signal hr : integer range 0 to 23 := 0;
  
  -- TODO: add signal for keypad input and time setting
  
begin
  -- clock process
  process (clk, rst)
  begin
    if (rst = '1') then
      count <= 0;
      sec <= 0;
      min <= 0;
      hr <= 0;
    elsif (rising_edge(clk)) then
      if (count = COUNT_MAX) then
        count <= 0;
        sec <= sec + 1;
        if (sec = 60) then
          sec <= 0;
          min <= min + 1;
          if (min = 60) then
            min <= 0;
            hr <= hr + 1;
            if (hr = 24) then
              hr <= 0;
            end if;
          end if;
        end if;
      else
        count <= count + 1;
      end if;
    end if;
  end process;
  
  -- TODO: add process for keypad input and time setting
  
  -- seven-segment display process
  process (sec, min, hr)
  begin
    case sec is
      when 0 => seg <= "0000001"; -- 0
      when 1 => seg <= "1001111"; -- 1
      when 2 => seg <= "0010010"; -- 2
      when 3 => seg <= "0000110"; -- 3
      when 4 => seg <= "1001100"; -- 4
      when 5 => seg <= "0100100"; -- 5
      when 6 => seg <= "0100000"; -- 6
      when 7 => seg <= "0001111"; -- 7
      when 8 => seg <= "0000000"; -- 8
      when 9 => seg <= "0000100"; -- 9
      when others => seg <= "1111111"; -- off
    end case;
    
    case min is
      when 0 => seg <= seg & "0000001"; -- 0
      when 1 => seg <= seg & "1001111"; -- 1
      when 2 => seg <= seg & "0010010"; -- 2
      when 3 => seg <= seg & "0000110"; -- 3
      when 4 => seg <= seg & "1001100"; -- 4
      when 5 => seg <= seg & "0100100"; -- 5
      when 6 => seg <= seg & "0100000"; -- 6
      when 7 => seg <= seg & "0001111"; -- 7
      when 8 => seg <= seg & "0000000"; -- 8
      when 9 => seg <= seg & "0000100"; -- 9
      when others => seg <= seg & "1111111"; -- off
    end case;
    
    case hr is
      when 0 => seg <= seg & "0000001"; -- 0
      when 1 => seg <= seg & "1001111"; -- 1
      when 2 => seg <= seg & "0010010"; -- 2
      when 3 => seg <= seg & "0000110"; -- 3
      when 4 => seg <= seg & "1001100"; -- 4
      when 5 => seg <= seg & "0100100"; -- 5
      when 6 => seg <= seg & "0100000"; -- 6
      when 7 => seg <= seg & "0001111"; -- 7
      when 8 => seg <= seg & "0000000"; -- 8
      when 9 => seg <= seg & "0000100"; -- 9
      when others => seg <= seg & "1111111"; -- off
    end case;
  end process;
  
  -- multiplexing process
  process (sec, min, hr)
  begin
    an <= "1110";
    seg <= "1111111";
    wait for 5 us;
    
    an <= "1101";
    seg <= "1111111";
    wait for 5 us;
    
    an <= "1011";
    seg <= "1111111";
    wait for 5 us;
    
    an <= "0111";
    seg <= "1111111";
    wait for 5 us;
  end process;
  
end architecture;

请注意，此代码仅用于示例和教育目的，可能需要进行更多的调整和完善，以适应您的具体需求和硬件环境。如果您不确定如何修改或使用此代码，请咨询您的电子工程师或高级编程人员