用MSP430的32768Hz晶振写的时钟

typedef unsigned char uchar;
typedef unsigned int  uint;
//typedef也是一种宏定义类型,其书写方式和#define相反

/*******液晶端口初始化*******/
#define out P3DIR|=BIT0+BIT1+BIT2//把P3_012三个口设为输出
#define lcd_enset P3OUT|=BIT2
#define lcd_enclear P3OUT&=~BIT2
#define lcd_rw1 P3OUT|=BIT1
#define lcd_rw0 P3OUT&=~BIT1
#define lcd_rs1 P3OUT|=BIT0
#define lcd_rs0 P3OUT&=~BIT0
#define keyin (P1IN & 0x0f)
 uchar temp,keynum=0;
int shi=23,fen=59,miao=55;//此处用char型会在按键调整减数到0时出错
/**********/
/*延时子程序*/
//调用8个时钟周期，返回6个，循环4个
//总周期个数为: 8+6+4*n=14+4*n 个时钟周期
//默认800k时钟，所以周期为1.25us 公式修正：17.5+5*n=定时时间
void delay(unsigned int x)//延时
{
 unsigned int i;
 i=x;
 for(;i>0;i--) ;
}
/******LCD写指令程序***********/
void write_com(unsigned char com)
{ out;
  P4DIR=0XFF;
  P4OUT=com;
  lcd_rw0;
  lcd_rs0;
  _NOP();
  lcd_enclear;
  delay(10);
  lcd_enset;
  delay(10);
  lcd_enclear;
}
/***********LCD写数据**************/
void write_data(unsigned char dat)
{   out;
   P4DIR=0XFF;
   P4OUT=dat;
   lcd_rw0;
   lcd_rs1;
   _NOP();
   _NOP();
   lcd_enclear;
   delay(10);
   lcd_enset;
   delay(10);
   lcd_enclear;
}
/*****写时分秒********/
void write_sfm(uchar add,uchar dat)
{
  uchar a,b;
  a=dat/10;
  b=dat%10;
  write_com(0x80+0x40+add);
  write_data(a+0x30);
  write_data(b+0x30);
 
}

/*********lcd初始化，写lcd功能与方式控制********/
void lcd_init()
{  out;
   write_com(0x38);
   delay(20);
   write_com(0x0f);
   delay(20);
   write_com(0x06);
   delay(20);
   write_com(0x0c);
   delay(20);
   write_com(0x01);
   delay(20);
  
   
   [page]
   
}

void Clock(void)
{
miao++;
  if(miao==60)
        {
          miao=0;
          fen++;
            if(fen==60)
              {
               fen=0;
               shi++;
                if(shi==24)
                  {
                    shi=0;                                   
                  }
                 write_sfm(2,shi);   
              }
         write_sfm(5,fen);
        }
write_sfm(8,miao);
   
}

void keyscan()
{
 
 if(keyin!=0x0f)
   {
           delay(5);            //延时消抖
            if(keyin != 0x0f)   //再次检测按键状态
            {
             temp=keyin;             
             while(keyin != 0x0f);  //等待按键被放开             
               if(temp==0x0e)
               {
                 keynum++;
                  switch(keynum)
                  {
                    case 1:                  
                         _DINT();
                       // CCTL0 &=~ CCIE; //两种停止时钟的方法效果一样                 
                        write_com(0x80+0x40+9);
                        write_com(0x0f);//光标开始闪
                        break;
                    case 2:
                          write_com(0x80+0x40+6);break;
                    case 3:
                          write_com(0x80+0x40+3);break;
                    case 4:                  
                         keynum=0;
                         write_com(0x0c);//开显示，光标不显示
                       _EINT();
                        //  CCTL0|=CCIE; //使用相应打开时钟的方法
                      break;
                  }
               }          
              if(temp==0x0d)
               {
                 // while(keyin != 0x0d);  //等待按键被放开     
                switch(keynum)
                {
                   case 1:
                     miao++;
                     if(miao==60)miao=0;
                     write_sfm(8,miao);
                     write_com(0x80+0x40+9);
                     break;
                    case 2:
                     fen++;
                     if(fen==60)fen=0;
                     write_sfm(5,fen);
                     write_com(0x80+0x40+6);
                     break;
                    case 3:
                     shi++;
                     if(shi==24)shi=0;
                     write_sfm(2,shi);
                     write_com(0x80+0x40+3);
                     break; 
                }    
              } 
            
            if(temp==0x0b)
               {
                 // while(keyin != 0x0d);  //等待按键被放开     
                switch(keynum)
                {
                   case 1:
                     miao--;
                     if(miao==-1)miao=59;
                     write_sfm(8,miao);
                     write_com(0x80+0x40+9);
                     break;
                    case 2:
                     fen--;
                     if(fen==-1)fen=59;
                     write_sfm(5,fen);
                     write_com(0x80+0x40+6);
                     break;
                    case 3:
                     shi--;
                     if(shi==-1)shi=23;
                     write_sfm(2,shi);
                     write_com(0x80+0x40+3);
                     break; 
                }    
              }   
                                                
            } 
   }
 }

int main( void )
{ P6DIR|=BIT3;
  P6OUT|=BIT3;
  //上两句是打开1602的背光电源
 
  WDTCTL = WDTPW + WDTHOLD;
      
       lcd_init();
       delay(500);
      
    write_com(0x80+0x40+4);
    write_data(':');
    write_com(0x80+0x40+7);
    write_data(':'); 
    write_sfm(2,shi);      
    write_sfm(5,fen);      
    write_sfm(8,miao);
   
   
     CCR0 = 32768 - 1;//设置定时器A的中断时间为1S
    TACTL = TASSEL_1 + MC_1; //计数时钟ACLK, 增计数模式
    CCTL0 |= CCIE; //使能CCR0比较中断
    _EINT();//打开全局中断
   
   
     P1DIR = 0xf0;  //设置P1.0~P.3为输入状态
   // P1DIR = BIT7;  //设置P1.0~P.3为输入状态，P1.7为输出
   // P1OUT = 0;
  //以上两句是在没有独立按键情况下把P1_7拉低成为地线 
   
      while(1)
      {
        keyscan(); 
      //本程序如果加低功耗模式会使按键功能失效        
      }
}

/*******************************************
函数名称：TimerA_ISR
功    能：定时器A的中断服务函数
********************************************/
#pragma vector=TIMERA0_VECTOR
__interrupt void TimerA_ISR(void)
{
    Clock();    
 }
//到此时钟加按键完成