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|        ---------------------------------------------------   [注:AT89S51使用12M晶振] =============================================================*/ #define LCM_RW  P2_0 //定義引腳 
#define LCM_RS  P2_1 
#define LCM_E   P2_2
 #define LCM_Data  P1 
#define Busy    0x80 //用于檢測LCM狀態字中的Busy標識 
＃i nclude <at89x51.h> void WriteDataLCM(unsigned char WDLCM); 
void WriteCommandLCM(unsigned char WCLCM,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 code *DData); 
void Delay5Ms(void); 
void Delay400Ms(void); 
unsigned char code uctech[] = {"uctech"}; 
unsigned char code net[] = {"uctech.icpcn.com"}; 
void main(void) 
{ 
 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, 5, uctech); 
 DisplayListChar(0, 0, net); 
 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; 
 LCM_RS = 1; 
 LCM_RW = 0; 
 LCM_E = 0; //若晶振速度太高可以在這后加小的延時 
 LCM_E = 0; //延時 
 LCM_E = 1; 
} 
//寫指令 
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC為0時忽略忙檢測 
{ 
 if (BuysC) ReadStatusLCM(); //根據需要檢測忙 
 LCM_Data = WCLCM; 
 LCM_RS = 0; 
 LCM_RW = 0;  
 LCM_E = 0; 
 LCM_E = 0; 
 LCM_E = 1;  
} 
//讀數據 
unsigned char ReadDataLCM(void) 
{ 
 LCM_RS = 1;  
 LCM_RW = 1; 
 LCM_E = 0; 
 LCM_E = 0; 
 LCM_E = 1; 
 return(LCM_Data); 
} 
//讀狀態 
unsigned char ReadStatusLCM(void) 
{ 
 LCM_Data = 0xFF;  
 LCM_RS = 0; 
 LCM_RW = 1; 
 LCM_E = 0; 
 LCM_E = 0; 
 LCM_E = 1; 
 while (LCM_Data & Busy); //檢測忙信號 
 return(LCM_Data); 
} 
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); 
} 
//按指定位置顯示一串字符 
void DisplayListChar(unsigned char X, unsigned char Y, unsigned char code *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 = 5; 
 unsigned int TempCycB; 
 while(TempCycA--) 
 { 
  TempCycB=7269; 
  while(TempCycB--); 
 }; 
}