把明浩的1602的程序移植到了ATMEGA8上，共享一下。
/*============================================================
        使用1602液晶顯示的實驗例子     明浩  2004/2/27
==============================================================

SMC1602A(16*2)模擬口線接線方式
連接線圖: 
       ---------------------------------------------------
       |LCM-----51   | LCM-----51   | LCM------51      |
       --------------------------------------------------|
       |DB0-----P1.0 | DB4-----P1.4 | RW-------P2.0    |
       |DB1-----P1.1 | DB5-----P1.5 | RS-------P2.1    |
       |DB2-----P1.2 | DB6-----P1.6 | E--------P2.2    |
       |DB3-----P1.3 | DB7-----P1.7 | VLCD接1K電阻到GND|
       ---------------------------------------------------

SMC1602A(16*2)模擬口線接線方式
連接線圖: 
       ---------------------------------------------------
       |LCM-----M8  |  LCM-----M8 | LCM------M8    |
       ----------------------------------------------|
       |DB0-----PB0 | DB4-----PB4 | RW-------PD6     |
       |DB1-----PB1 | DB5-----PB5 | RS-------PD7     |
       |DB2-----PB2 | DB6-----PB6 | E--------PD5     |
       |DB3-----PB3 | DB7-----PB7 | VLCD接1K電阻到GND|
       ---------------------------------------------------


[注:AT89S51使用12M晶振]
=============================================================*/
/*************************************************************
  以前的c51的液晶顯示模塊移植到avr---atmega8中
*************************************************************/
/**************************************************************
#define LCM_RW  P1_1 //定義引腳
#define LCM_RS  P1_2
#define LCM_E   P1_0
#define LCM_Data  P2
#define Busy    0x80 //用于檢測LCM狀態字中的Busy標識

#include <at89x51.h>
**********************************************************/
#include <iom8V.h>
#include <macros.h>

#define CTLPORT PORTD   //模擬總線用了PD口的PD5,PD6,PD7
#define LCD_RS  7       // pin-0 on CTLPORT
#define LCD_RW  6       // pin-1 on CTLPORT
#define LCD_E   5       // pin-2 on CTLPORT

#define SET_LCD_E       CTLPORT|=(1<<LCD_E)        // LCD: E = 1
#define CLR_LCD_E       CTLPORT&=~(1<<LCD_E)       // LCD: E = 0
#define SET_LCD_RW      CTLPORT|=(1<<LCD_RW)       // LCD: R/W = 1 (read)
#define CLR_LCD_RW      CTLPORT&=~(1<<LCD_RW)      // LCD: R/W = 0 (write)
#define SET_LCD_RS      CTLPORT|=(1<<LCD_RS)       // LCD: R/S = 1 (data reg)
#define CLR_LCD_RS      CTLPORT&=~(1<<LCD_RS)      // LCD: R/S = 0 (status reg)

//#define DataPortOUT     PORTB                // 數據端口PB口
//#define DataPortIN      PINB
#define DataPortfx      DDRB
#define Busy            0x80
#define LCM_Data        PORTB                // 數據端口PB口
#define LCM_Data1       PINB                 // 數據端口PB口

#pragma data:code
unsigned char const table_1[] = {"1515484166"};
unsigned char const table_2[] = {"0123456789"}; 
#pragma data:data

void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,unsigned char BuysC);
unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
void LCMInit(void);
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData);
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char const *DData);
void Delay5Ms(void);
void Delay400Ms(void);



void main(void)
{
 unsigned  char i;
 DDRD=0XFF;//PD設為輸出
 DDRB=0XFF;//PB設為輸出
 Delay400Ms(); //啟動等待，等LCM講入工作狀態
 LCMInit(); //LCM初始化
 Delay5Ms(); //延時片刻(可不要)

 DisplayListChar(0, 0, table_1);
 DisplayListChar(0, 1, table_2);
 /*Delay400Ms(); //啟動等待，等LCM進入工作狀態
 WriteCommandLCM(0x08,1); //關閉顯示
 WriteCommandLCM(0x01,1); //顯示清屏
 WriteCommandLCM(0x06,1); // 顯示光標移動設置
 WriteCommandLCM(0x0f,1); // 顯示開及光標設置，閃
 for(i=0;i<8;i++)
 {
  DisplayOneChar(i, 0, table_1[i]); //顯示單個字符
 }
 WriteCommandLCM(0x07,1); // 顯示光標移動設置
 
 for(i=0;i<8;i++)
 {
  DisplayOneChar(i+8, 0, table_2[i]); //顯示單個字符
 }
 WriteCommandLCM(0x0c,1); // 顯示開及光標設置，不閃
 ReadDataLCM();//測試用句無意義*/
 while(1);
}

//寫數據
void WriteDataLCM(unsigned char WDLCM)
{
 ReadStatusLCM(); //檢測忙
 LCM_Data = WDLCM;
 SET_LCD_RS;
 CLR_LCD_RW;
 SET_LCD_RS;
 CLR_LCD_RW;
 CLR_LCD_E; //若晶振速度太高可以在這后加小的延時
 CLR_LCD_E; //延時
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 SET_LCD_E;
 SET_LCD_E;
}

//寫指令
void WriteCommandLCM(unsigned char WCLCM,unsigned char BuysC) //BuysC為0時忽略忙檢測
{
 if (BuysC) ReadStatusLCM(); //根據需要檢測忙
 LCM_Data = WCLCM;
 CLR_LCD_RS;
 CLR_LCD_RW; 
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 SET_LCD_E; 
 SET_LCD_E; 
}

//讀數據
unsigned char ReadDataLCM(void)
{
 SET_LCD_RS; 
 SET_LCD_RW;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 SET_LCD_E;
 SET_LCD_E;
 return(LCM_Data);
}

//讀狀態
unsigned char ReadStatusLCM(void)
{
 DDRB=0x00; //輸入
 CLR_LCD_RS;
 SET_LCD_RW;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 CLR_LCD_E;
 SET_LCD_E;
 while (LCM_Data1 & Busy); //檢測忙信號
 DDRB=0xff;//變回輸出
 return(LCM_Data1);
}

void LCMInit(void) //LCM初始化
{
 LCM_Data = 0;
 WriteCommandLCM(0x38,0); //三次顯示模式設置，不檢測忙信號
 Delay5Ms(); 
 WriteCommandLCM(0x38,0);
 Delay5Ms(); 
 WriteCommandLCM(0x38,0);
 Delay5Ms(); 

 WriteCommandLCM(0x38,1); //顯示模式設置,開始要求每次檢測忙信號
 WriteCommandLCM(0x08,1); //關閉顯示
 WriteCommandLCM(0x01,1); //顯示清屏
 WriteCommandLCM(0x06,1); // 顯示光標移動設置
 WriteCommandLCM(0x0C,1); // 顯示開及光標設置
}

//按指定位置顯示一個字符
void DisplayOneChar(unsigned char X, unsigned char Y, unsigned char DData)
{
 Y &= 0x1;
 X &= 0xF; //限制X不能大于15，Y不能大于1
 if (Y) X |= 0x40; //當要顯示第二行時地址碼+0x40;
 X |= 0x80; //算出指令碼
 WriteCommandLCM(X, 0); //這里不檢測忙信號，發送地址碼
 WriteDataLCM(DData);
 WriteCommandLCM(X, 0); //光標返回，調節時很重要
}

//按指定位置顯示一串字符
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char const *DData)
{
 unsigned char ListLength;

  ListLength = 0;
 Y &= 0x1;
 X &= 0xF; //限制X不能大于15，Y不能大于1
 while (DData[ListLength]>0x20) //若到達字串尾則退出
  {
   if (X <= 0xF) //X坐標應小于0xF
    {
     DisplayOneChar(X, Y, DData[ListLength]); //顯示單個字符
     ListLength++;
     X++;
    }
  }
}

//5ms延時
void Delay5Ms(void)
{
 unsigned int TempCyc = 5552;
 while(TempCyc--);
}

//400ms延時
void Delay400Ms(void)
{
 unsigned char TempCycA = 9;
 unsigned int TempCycB;
 while(TempCycA--)
 {
  TempCycB=7777;
  while(TempCycB--);
 };
}