51單片機結構簡單，架構體系完備，學習資料豐富，應用領域廣泛。通過對51單片機的學習，可幫助小白實現快速入門電子設計，理解電路系統工作原理，為高級嵌入式芯片的學習及開發打下堅實基礎。

本篇描述

1、51+Proteus8.10；

2、學習ADC0808/0809模擬量檢測、數據轉換、1602顯示驅動；

仿真設計

采用Proteus作為仿真設計工具。Proteus是一款著名的EDA工具（仿真軟件），從原理圖布圖、代碼調試到單片機與外圍電路協同仿真，一鍵切換到PCB設計，真正實現了從概念到產品的完整設計。

軟件設計

采用Keil作為軟件設計工具。Keil提供了包括C編譯器、宏匯編、鏈接器、庫管理和一個功能強大的仿真調試器等在內的完整開發方案，通過一個集成開發環境（μVision）將這些部分組合在一起。

#include 
#include "SMC1602.h"
#include "DATransform.h"
#define TIME0H 0x3C
#define TIME0L 0xB0


unsigned char uc_Clock=0;    //?¨ê±?÷0?D????êy
bit b_DATransform=0;


void vShowVoltage(unsigned int uiNumber)
{
  unsigned char ucaNumber[3],ucCount;


  if(uiNumber>999)          
    uiNumber=999;


  ucaNumber[0]=uiNumber/100;                //°?????êy×?μ???????′?è?êy×é?￡
  ucaNumber[1]=(uiNumber-100*(int)ucaNumber[0])/10;              
  ucaNumber[2]=uiNumber-100*(int)ucaNumber[0]-10*ucaNumber[1];


  for(ucCount=0;ucCount<3;ucCount++)
    {
    vShowOneChar(ucaNumber[ucCount]+48);        //′óê×??μ?????eò?ê?3??￡
    if(ucCount==0)
      vShowOneChar('.');
    }
}


void main()
{
  TMOD=0x01;      //?¨ê±?÷0￡??￡ê?1?￡
  TH0=TIME0H;
  TL0=TIME0L;
  TR0=1;        //???ˉ?¨ê±?÷?￡
  ET0=1;        //?a?¨ê±?÷?D???￡
  EA=1;        //?a×ü?D??
  vdInitialize();
  vWriteCMD(0x84);     //D′è???ê??eê?μ??·￡¨μú?tDDμúò???????￡
  vShowChar("Voltage:");
  vWriteCMD(0xC9);
  vShowChar("(V)");


  while(1)
    {
    if(b_DATransform==1)
      {
      b_DATransform=0;
      vWriteCMD(0xC4);
      vShowVoltage(uiADTransform());
      }
    }
}


void Time0() interrupt 1
{
  if(uc_Clock==0)
    {
    uc_Clock=5;
    b_DATransform=1;
    }
  else
    uc_Clock--;


  TH0=TIME0H;       //???′?¨ê±?÷0?￡
  TL0=TIME0L;
}

SMC1602.c

#include"SMC1602.h"


void vWriteCMD(unsigned char ucCommand)            
{
  vDelay();        //?è?óê±?￡
  LCDE=1;          //è?oó°?￡ì￡?￡????aD′è??üá?×′ì??￡
  LCDRS=0;
  LCDRW=0;
  LCDPORT=ucCommand;      //?ùê?3??üá??￡
  LCDE=0;          //×?oó?′DD?üá??￡
}


void vWriteData(unsigned char ucData)            
{
  vDelay();         //?è?óê±?￡
  LCDE=1;           //è?oó°?￡ì￡?￡????aD′è?êy?Y×′ì??￡
  LCDRS=1;
  LCDRW=0;
  LCDPORT=ucData;         //?ùê?3?êy?Y?￡
  LCDE=0;           //×?oó??ê?êy?Y?￡
}


void vShowOneChar(unsigned char ucChar)
{
  switch(ucChar)
    {
    case ' ': vWriteData(0x20);break;
    case '!': vWriteData(0x21);break;
    case '"': vWriteData(0x22);break;
    case '#': vWriteData(0x23);break;
    case '$': vWriteData(0x24);break;
    case '%': vWriteData(0x25);break;
    case '&': vWriteData(0x26);break;
    case '>': vWriteData(0x27);break;
    case '(': vWriteData(0x28);break;
    case ')': vWriteData(0x29);break;
    case '*': vWriteData(0x20);break;
    case '+': vWriteData(0x2A);break;
    case '-': vWriteData(0x2D);break;
    case '/': vWriteData(0x2F);break;
    case '=': vWriteData(0x3D);break;
    case '<': vWriteData(0x3E);break;
    case '?': vWriteData(0x3F);break;
    case '.': vWriteData(0x2E);break;
    case ':': vWriteData(0x3A);break;


    case '0': vWriteData(0x30);break;
    case '1': vWriteData(0x31);break;
    case '2': vWriteData(0x32);break;
    case '3': vWriteData(0x33);break;
    case '4': vWriteData(0x34);break;
    case '5': vWriteData(0x35);break;
    case '6': vWriteData(0x36);break;
    case '7': vWriteData(0x37);break;
    case '8': vWriteData(0x38);break;
    case '9': vWriteData(0x39);break;


    case 'A': vWriteData(0x41);break;
    case 'B': vWriteData(0x42);break;
    case 'C': vWriteData(0x43);break;
    case 'D': vWriteData(0x44);break;
    case 'E': vWriteData(0x45);break;
    case 'F': vWriteData(0x46);break;
    case 'G': vWriteData(0x47);break;
    case 'H': vWriteData(0x48);break;
    case 'I': vWriteData(0x49);break;
    case 'J': vWriteData(0x4A);break;
    case 'K': vWriteData(0x4B);break;
    case 'L': vWriteData(0x4C);break;
    case 'M': vWriteData(0x4D);break;
    case 'N': vWriteData(0x4E);break;
    case 'O': vWriteData(0x4F);break;
    case 'P': vWriteData(0x50);break;
    case 'Q': vWriteData(0x51);break;
    case 'R': vWriteData(0x52);break;
    case 'S': vWriteData(0x53);break;
    case 'T': vWriteData(0x54);break;
    case 'U': vWriteData(0x55);break;
    case 'V': vWriteData(0x56);break;
    case 'W': vWriteData(0x57);break;
    case 'X': vWriteData(0x58);break;
    case 'Y': vWriteData(0x59);break;
    case 'Z': vWriteData(0x5A);break;


    case 'a': vWriteData(0x61);break;
    case 'b': vWriteData(0x62);break;
    case 'c': vWriteData(0x63);break;
    case 'd': vWriteData(0x64);break;
    case 'e': vWriteData(0x65);break;
    case 'f': vWriteData(0x66);break;
    case 'g': vWriteData(0x67);break;
    case 'h': vWriteData(0x68);break;
    case 'i': vWriteData(0x69);break;
    case 'j': vWriteData(0x6A);break;
    case 'k': vWriteData(0x6B);break;
    case 'l': vWriteData(0x6C);break;
    case 'm': vWriteData(0x6D);break;
    case 'n': vWriteData(0x6E);break;
    case 'o': vWriteData(0x6F);break;
    case 'p': vWriteData(0x70);break;
    case 'q': vWriteData(0x71);break;
    case 'r': vWriteData(0x72);break;
    case 's': vWriteData(0x73);break;
    case 't': vWriteData(0x74);break;
    case 'u': vWriteData(0x75);break;
    case 'v': vWriteData(0x76);break;
    case 'w': vWriteData(0x77);break;
    case 'x': vWriteData(0x78);break;
    case 'y': vWriteData(0x79);break;
    case 'z': vWriteData(0x7A);break;


    default: break;
    }
}


void vShowChar(unsigned char ucaChar[])
{
  unsigned char ucCount;
  for(ucCount=0;;ucCount++)
    {
    vShowOneChar(ucaChar[ucCount]);
    if(ucaChar[ucCount+1]=='?')
      break;
    }
}


void vDelay()
{
  unsigned int uiCount;
  for(uiCount=0;uiCount<250;uiCount++);
}

SMC1602.h

#ifndef __SMC1602_H__
#define__SMC1602_H__
#include 
#define vdInitialize()  vWriteCMD(0x01);vWriteCMD(0x38);vWriteCMD(0x0C);    //3?ê??ˉ
#define LCDRS P3_5  
#define LCDRW P3_6  
#define LCDE P3_7  
#define LCDPORT P0
voidvDelay();//?óê±oˉêy?￡
voidvWriteCMD(unsignedcharucCommand);//°?1???üá?D′è?LCD?￡
voidvWriteData(unsignedcharucData);//°?1??êy?YD′è?LCD?￡
voidvShowOneChar(unsignedcharucChar);
voidvShowChar(unsignedcharucaChar[]);
#endif

DATransform.c

#include 
#define START P3_4  //ATART￡?ALE?ó?ú?￡0->1->0:???ˉAD×a???￡
#define EOC P3_3   //×a??íê±?óé0±?1.
#define OUTPORT P2 


unsigned int uiADTransform()
{
  unsigned int uiResult;


  START=1;       //???ˉAD×a???￡
  START=0;


  while(EOC==0);     //μè′y×a???áê??￡


  uiResult=OUTPORT;   //3?è?×a???á1??￡


  uiResult=(100*uiResult)/51;       //′|àí?????á1??￡


  return uiResult;
}

DATransform.h

#ifndef __DATRANSFORM_H__
#define__DATRANSFORM_H__
unsignedintuiADTransform();
#endif