十年專注單片機方案開發(fā)的方案公司英銳恩，分享F72+24C01+LED+按鍵。英銳恩現(xiàn)提供服務(wù)產(chǎn)品涉及主控芯片：8位單片機、16位單片機、32位單片機及各類運算放大器等。

#include
#include
#define uchar  unsigned char
#define uint   unsigned int

#define bitset(var,bitno)((var)|=1<<(bitno))
#define bitclr(var,bitno)((var)&=~(1<<(bitno)))

static volatile unsigned char acc @ 0x20;
static volatile bit acc0     @ (unsigned)&acc*8+0;
static volatile bit acc7     @ (unsigned)&acc*8+7;

static volatile unsigned char err @ 0x21;
static volatile bit err0     @ (unsigned)&err*8+0;
static volatile bit err3     @ (unsigned)&err*8+3;
static volatile bit err6     @ (unsigned)&err*8+6;
static volatile bit err7     @ (unsigned)&err*8+7;
#define  SCL   RA1 //1  ;24C01-6
#define  SDA   RA2 //2  ;24C01-5
#define  SCLIO  TRISA1 //1
#define  SDAIO  TRISA2 //2
#define  SLAW   0x0A0//尋址字節(jié)寫
#define  SLAR   0x0A1//尋址字節(jié)讀
#define  KS1   RA3
#define  KS2   RA4
#define  KS3   RA5
#define  Ksec  RC0
#define  Kmin  RC1

const   unsigned char table[11]={ 0x0C0, 0x0F9, 0x0A4,0x0B0, 0x99, 0x92,0x82, 0x0F8,0x80,0x90,0x0ff};
unsigned  char  y,Tsmh, sec, min,hour ;
uchar  BCD[4];//數(shù)據(jù)送LED的數(shù)據(jù) 暫存區(qū)
uchar  Reeprom[5];
/////中斷//////////////////
void  interrupt  adint( )
  {  uchar x,y,z;
      TMR0=39;
     OPTION =0x87;// B'10000111'    //取消B口上拉電阻    1:256 預(yù)分頻器分配給定時器0，分頻比1:64
      //ADIF=0;//清/AD中斷標志位
      T0IF=0;//        ;清定時器0溢出中斷標志位
      x++;// 記 數(shù)器
      if(x==18)

    {  
         x=0;
         sec--; //秒-1  
          y++;   //秒   記 數(shù)器
          if(y==60)
                {
                  y=0;
                  min--;//分-1
                  z++;  // 記 數(shù)器
                  if(z==60)
                          {
                            z=0;
                            hour--; //時-1
                           }
                 }
         }        
  }
//延時子程序
void delay()
{  
  unsigned  int i=300;
   while(i--); //for(i=300;0<i;>}
//十六進制轉(zhuǎn)十進制程序
void  H_BCD (uchar x,uchar i)
{  
        
    BCD [1]=x%10;
    BCD [0]=x/10;
    BCD [3]=i%10;
    BCD [2]=i/10;              // BCD [0]=x/100;
}

void display()//顯示程序
    {  
       unsigned char b,c;
         b=0x10;
        for(c=0;c<4;c++)
         {
      PORTB=table[BCD[c]] ;      
      PORTC=(PORTC&8)|b;
            CLRWDT();
      delay();
            b=b<<1;
           

}  PORTB=err;
            PORTC=(PORTC&8)|4;
            CLRWDT();
      delay();
            PORTC=PORTC&8;
}
//系統(tǒng) 各I/O初始化子程序
void  initial ()
{   TRISB=0;
    TRISC=3;
    ADCON1=7;;//設(shè)置RA為IO口
    TRISA=0x0ff;
  
   OPTION=135;//取消B口上拉電阻  B'10000111';   1:256     B'10000101'1:64
             // 預(yù)分頻器分配給定時器0，
    T0IF= 0; // 清溢出中斷標志位
    T0IE=1;    //定時器0溢出中斷允許
  //  GIE=1;    //總中斷允許
    TMR0=39;
}
//////////////24C01/////////////////
//--------應(yīng)答位檢查---------
void  Cack()
{ SCL=1;
  SDAIO=1;//輸入1
  SCLIO=0;
  err7=SDA;//c=1錯誤ERR
  SCL=0;
}

///--------發(fā)送非應(yīng)答位----------
void  Mnack()
{  
   SDA=1;
   SCLIO=0;
   SDAIO=0;//輸出
   SCL=1;
   NOP();
   NOP();
   SCL=0;
   SDA=0;
}
//-------發(fā)送應(yīng)答位---------------
void  Mack()

{
  SDA=0;
  SCLIO=0;
  SDAIO=0;//輸出
  SCL=1;
  NOP();
  NOP();
  SCL=0;
  SDA=1;
}
//--------停止IC總線---------------
void  Stop()
{
     SDA=0;
     SCLIO=0;
     SDAIO=0;//輸出
     SCL=1;
     NOP();
     NOP();
     SDA=1;
     NOP();
     NOP();
}
//--------;啟動IC總線-------------
void  Sta()
{
    SDAIO=0;//輸出
    SCLIO=0;
    SDA=1;

   SCL=1;
    NOP();
    NOP();
    SDA=0;
    NOP();
    NOP();
    SCL=0;
}
    
//--------寫一字節(jié)------------------------
void  Wrbyt(uchar x)
{
  uchar i;
  acc=x;
  SCLIO=0;

  SDAIO=0;
  for(i=8;i>0;i--)
  {
  
   SDA=acc7;
   SCL=1;
   NOP();
   NOP();
   SCL=0;
   SDA=0;
   acc=acc<<1;
   }
}
//---------讀一字節(jié)-----------------
uchar   Rdbyt( )
{
    uchar i;
    SCLIO=0;
    SDAIO=1;//;輸入
    for(i=8;i>0;i--)
     {  
         acc=acc<<1;//接收數(shù)據(jù)左移寄存器
         SCL=1;
         acc0=SDA;
         SCL=0;
         NOP();
       }
     return(acc);
}
////---------讀n個數(shù)據(jù)----------------

void  Rdnbyt (uchar SLARtemp ,uchar Repromn,uchar temp2) //Repromn傳送數(shù)據(jù)個數(shù)
  {  
     uchar i;
     i= temp2;
     do{
        Sta();           //啟動IC總線-//    
        Wrbyt(SLARtemp); //寫一字節(jié)
        Cack();          //應(yīng)答位檢查-
       } while(err7==1);
    
       while(Repromn--)
       {
        Reeprom[i]=Rdbyt();  //讀一字節(jié)

 i++;
         Mack(); //發(fā)送應(yīng)答位
        }
      Mnack();  // 發(fā)送非應(yīng)答位
      Stop();   //停止IC總線
}
//---------寫n個數(shù)據(jù)---------------
void  Wrnbyt(uchar SLAwtemp , uchar Wepromn,uchar temp1)
{  uchar i;
   i= temp1;
    err7=1;

  while(Wepromn--)
     {
       if(err7==1)            //c=1E0,ERR
         {   i=temp1;
             Sta();           //啟動IC總線
             Wrbyt(SLAwtemp); //寫一字節(jié)
             Cack();          //應(yīng)答位檢查-
           }
          Wrbyt( Reeprom[i]);// Reeprom[t]);//寫一字節(jié)
          i++;
          Cack();//應(yīng)答位檢查
     }
    Stop();   //停止IC總線    
}
//////////按鍵掃描/////////////////////////////////////////////////

void   Key()
   {
       uchar a,b,i,c,d;
      if( KS3==0)
      {  a=20;
          while(a--) display();
         if(56!=(PORTA&56))
         {
            while( KS3==0) display(); di();
            if (Ksec ){b=1;i=3;c=1;}//是秒？？？
            else      {b=3;i=5;c=3;}//
               d=0;  
            while (b<i&&d<20)>             {    
                 uchar  z,x;
                 for(z=50;z>0&&b<i;z--)>                  {   z--;
                      H_BCD (Reeprom[c],Reeprom[c+1] );  //十六進制轉(zhuǎn)十進制程序
                      display(); 

  a=PORTA&56 ;
                      switch(a)
                        {
                           case 48 : if(Reeprom[b]!=99) //110 ks1=0
                                        Reeprom[b]++;
                                     for(x=10;x>0&&56!=(PORTA&56);x--)
                                        display();d=0; break;
                           case 40 : if(Reeprom[b]!=0) //101 ks2=0
                                       Reeprom[b]--;
                                    for(x=10;x>0&&56!=(PORTA&56);x--)
                                       display(); d=0; break;
                            case 24 :  b++;   while( KS3==0) display();d=0; break; //011 ks3=0
                         }

  }
                      if (b<i)
                      {
                        for(z=50; z>0&&56==(PORTA&56);z--)//被調(diào)整數(shù)閃爍程序
                        {  
                          if (b==1||b==3) { BCD[0]=10; BCD[1]=10;}
                          else            { BCD[2]=10; BCD[3]=10;}
                          display( );
                          //z--;
                        
                        } d++;
                       }
                }
                 while( KS3==0)display( );
                Wrnbyt( SLAW ,5,0); //寫2個數(shù)據(jù)
                Tsmh=0;
                err3=1; //開機結(jié)束
                
           }

 }
}
void main()
  {
        initial ();  //系統(tǒng) 各I/O初始化子程序
        Wrnbyt ( SLAW ,1,0); //寫1個數(shù)據(jù)=0
        Rdnbyt ( SLAR ,4,1); //尋址字節(jié)讀#0A1
        sec= Reeprom[1];
        min= Reeprom[3];
        err3=0;
        bitclr( err,0);
        Tsmh=1; 

while(1)
       {  
           while (Tsmh)
           {    ei();
                if(err3==0){ if (Ksec ){H_BCD (sec,Reeprom[2]);Tsmh=sec;}//秒
                            else      {H_BCD (min,Reeprom[4]);Tsmh=min;}//分
                            RC3=0; bitclr( err,1); bitset( err,2);
                           } //關(guān)機
                else      { if (Ksec ){H_BCD (Reeprom[1],sec);Tsmh=sec;}//秒
                            else      {H_BCD (Reeprom[3],min);Tsmh=min;}//分
                            RC3=1; bitset( err,1); bitclr( err,2);
                           } //開機
               display(); //顯示程序
               Key();     //按鍵掃描
              if(err6!=Ksec){Tsmh=0;err6=Ksec;  err3=1;} //判斷是否轉(zhuǎn)換//開機結(jié)束
            }
          if(err3==0) {err3=1;sec=Reeprom[2];min=Reeprom[4];} //送開機 數(shù)據(jù)
          else        {err3=0;sec=Reeprom[1];min=Reeprom[3];} //送關(guān)機 數(shù)據(jù)
          if (Ksec ) Tsmh=sec;
          else       Tsmh=min;
        }
}

（文源網(wǎng)絡(luò)，侵刪）