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|
       ---------------------------------------------------

Keyboard接線
   PS/2--------51
      1 DATA------P3.4
   3 GND
      4 VCC
      5 CLK-------P3.3 接在51的外部中斷，觸發(fā)方式為低電平

本程序源碼只供學(xué)習(xí)參考，不得應(yīng)用于商業(yè)用途，如有需要請聯(lián)系作者。

[注:AT89x51使用12M或11.0592M晶振,實(shí)測使用11.0592M]
[Keil uV2 7.01編譯運(yùn)行通過 程序中沒有做鍵盤數(shù)據(jù)的奇偶校驗(yàn)]

=============================================================*/
#include
#include "scancodes.h"

#define LCM_RW  P2_0 //定義LCD引腳
#define LCM_RS  P2_1
#define LCM_E   P2_2
#define LCM_Data  P1

#define Key_Data P3_4 //定義Keyboard引腳
#define Key_CLK  P3_3

#define Busy    0x80 //用于檢測LCM狀態(tài)字中的Busy標(biāo)識

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);
void Decode(unsigned char ScanCode);
void WriteDataLCM(unsigned char WDLCM);
void WriteCommandLCM(unsigned char WCLCM,BuysC);

unsigned char ReadDataLCM(void);
unsigned char ReadStatusLCM(void);
unsigned char code cdle_net[] = {"www.cdle.net--"};
unsigned char code email[] = {"pnzwzw@cdle.net"};
unsigned char code Cls[] = {"                "};
static unsigned char IntNum = 0; //中斷次數(shù)計(jì)數(shù)
static unsigned char KeyV; //鍵值
static unsigned char DisNum = 0; //顯示用指針
static unsigned char Key_UP=0, Shift = 0;//Key_UP是鍵松開標(biāo)識，Shift是Shift鍵按下標(biāo)識
static unsigned char BF = 0; //標(biāo)識是否有字符被收到

void main(void)
{
unsigned char TempCyc;

Delay400Ms(); //啟動等待，等LCM講入工作狀態(tài)
LCMInit(); //LCM初始化
Delay5Ms(); //延時(shí)片刻(可不要)

DisplayListChar(0, 0, cdle_net);
DisplayListChar(0, 1, email);
ReadDataLCM();//測試用句無意義
for (TempCyc=0; TempCyc<10; TempCyc++)
   Delay400Ms(); //延時(shí)
DisplayListChar(0, 1, Cls);

IT1 = 0; //設(shè)外部中斷1為低電平觸發(fā)
EA = 1;
EX1 = 1; //開中斷

do
  {
   if (BF)
    Decode(KeyV);
   else
    EA = 1; //開中斷
  }
while(1);
}

//寫數(shù)據(jù)
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(shí)
LCM_E = 0; //延時(shí)
LCM_E = 1;
}

//寫指令
void WriteCommandLCM(unsigned char WCLCM,BuysC) //BuysC為0時(shí)忽略忙檢測
{
if (BuysC) ReadStatusLCM(); //根據(jù)需要檢測忙
LCM_Data = WCLCM;
LCM_RS = 0;
LC