count60.vhd

用chdl编写液晶块驱动程序。有详细的说明

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
USE IEEE.STD_LOGIC_ARITH.ALL;
ENTITY COUNT60 IS
PORT(CLK:IN STD_LOGIC;
      CO:OUT STD_LOGIC;
      EN:IN STD_LOGIC;
    DOUT:OUT STD_LOGIC_VECTOR(5 DOWNTO 0));
END ENTITY;
ARCHITECTURE ART OF COUNT60 IS
SIGNAL CNT:STD_LOGIC_VECTOR(5 DOWNTO 0);
BEGIN
PROCESS(CLK)
BEGIN
IF CLK'EVENT AND CLK='1' THEN
  IF EN='1' THEN
    IF CNT="111011" THEN
      CNT<="000000";CO<='1';
    ELSE
      CNT<=CNT+1;CO<='0';
    END IF;
  END IF;
END IF;
END PROCESS;
DOUT<=CNT;
END ARCHITECTURE;