1602基本液晶显示屏，学会对1602操作，编程能力会更进一步的，下面我将自己的代码放在下面，仅供参考。

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

entity lcd1602 is port
(
	clk:		in std_logic; 
	rs,rw,en:	out std_logic; 
	beer:		out bit; 
	lcd_date:	out std_logic_vector(7 downto 0)
); 
-- rest: out std_logic); 
end lcd1602; 

architecture xianshi of lcd1602 is type state is(s0,s1,s2,s3,s4,s5,s6,s7,s8,s9,sa,sb,sc,sd,se,sf,sg,sh,si,sj);
--s1 显示模式设置状态 38H 
--s2 显示关闭状态 08H 
--s3 显示清屏状态 01H 
--s4 显示开，光标设置 0cH 
--s5 显示光标移动状态 06H 
--S6 写地址状态，显示在哪行与列 
--s7 写数据状态 

signal current_state:	state; 
signal lcd_clk:			std_logic; 
signal count:			integer range 0 to 2500000; -- 
signal cnt:				integer range 0 to 3; 
begin 
	beer	<=	'1'; 
	en		<=	lcd_clk; 
	rw		<=	'0'; 
end
	
process(clk)-- 产生lcd_clk 
begin 
	if clk'event and clk='1' then 
		if count = 2500000 then 
			count <= 0; -- 
			cnt <= cnt+1; 
			lcd_clk <= not lcd_clk; 
		else 
			count <= count+1; 
		end if; 
	end if; 
end process; 

process(clk,lcd_clk) 
begin 
	if lcd_clk'event and lcd_clk='1' then 
		rs<='0';
		case current_state is 
		when s0=>lcd_date<="00111000";--显示模式设置状态 38H 
		current_state<=s1; when s1=>lcd_date<="00001000";-- 显示关闭状态 08H 
		current_state<=s2; when s2=>lcd_date<="00000001";-- 显示清屏状态 01H 
		current_state<=s3; when s3=>lcd_date<="00001100";--显示开，光标设置 0cH 
		current_state<=s4; when s4=>lcd_date<="00000110";--显示光标移动状态 
		current_state<=s5; when s5=>lcd_date<="10000001";--写地址状态，显示在哪行与列 入口地址 
		current_state<=s6; when s6=>rs<='1';----写数据，字符W 
		lcd_date<="01010111"; --
		when 3=>lcd_date<="01000011"; 
		current_state<=s7;when s7=>rs<='1';----写数据，字符W 
		lcd_date<="01010111";
		current_state<=s8;	when s8=>rs<='1';----写数据，字符W 
		lcd_date<="01010111"; 
		current_state<=s9;	when s9=>rs<='1';----写数据，字符. 
		lcd_date<="00101110"; 
		current_state<=sa;  when sa=>rs<='1';----写数据，字符L 
		lcd_date<="01001100"; 
		current_state<=sb; 	when sb=>rs<='1';----写数据，字符J 
		lcd_date<="01001010"; 
		current_state<=sc; 	when sc=>rs<='1';----写数据，字符D 
		lcd_date<="01000100"; 
		current_state<=sd; 	when sd=>rs<='1';----写数据，字符X 
		lcd_date<="01011000"; 
		current_state<=se; 	when se=>rs<='1';----写数据，字符. 
		lcd_date<="00101110"; 
		current_state<=sf; 	when sf=>rs<='1';----写数据，字符C 
		lcd_date<="01000011"; 
		current_state<=sg; 	when sg=>rs<='1';----写数据，字符o 
		lcd_date<="01001111"; 
		current_state<=sh; 	when sh=>rs<='1';----写数据，字符. 
		lcd_date<="00101110"; 
		current_state<=si; 	when si=>rs<='1';----写数据，字符C 
		lcd_date<="01000011"; 
		current_state<=sj; 	when sj=>rs<='1';----写数据，字符C 
		lcd_date<="01000011"; 
		current_state<=s0; 	when others=>rs<='1'; 
		lcd_date<="01000000"; 
		current_state<=s0; 
		end case; 
	end if; 
end process; 
end xianshi;