PCF8563

PCF8563的SCL为时钟输入端，数据随时钟信号同步输入器件或从器件输出；SDA为双向引脚，用于串行数据的输入输出；INT是中断信号输出端，可通过设置报警寄存器按指定时间在该脚产生报警信号，低电平有效；SDA、SCL、INT均为漏极开路，必须上拉电阻；X1、X2分别为反相放大器的输入、输出端；可在X1端接入32.768kHz的石英晶振，配置成片内振荡器。

 PCF8563的从地址：读地址SLAR为A3H、写地址SLAW为A2H，PCF8563I2C通信实现有字节写/读两种状态。；屏蔽无效位 MOV MIN，A ；送秒寄存器 MOV A，41H ；取分字节 ANL A，#7EH ；屏蔽无效位

＃i nclude <reg52.h>
＃i nclude <intrins.h>
#define uchar unsigned char
sbit SDA=P3^4;
sbit SCL=P3^5;
sbit P10=P1^0;
uchar g8563_Store[4];
uchar code c8563_Store[4]={0x00,0x59,0x07,0x01};

void Delay()
{
   // {P10=1;_nop_();P10=0;}

    _nop_();
   _nop_();
}

void Start()
{ EA=0;
   SDA=1;
   SCL=1;
   Delay();
   SDA=0;
   Delay();
   SCL=0;
}

void Stop()
{
   SDA=0;
   SCL=0;
   Delay();
   SCL=1;
   Delay();
   SDA=1;
   Delay();
   EA=1;
}

void WriteACK(uchar ack)
{
   SDA=ack;
   Delay();
   SCL=1;
   Delay();
   SCL=0;
}

void WaitACK()
{ uchar errtime=20;
   SDA=1;
   Delay();
   SCL=1;
   Delay();
   while(SDA)
   { errtime--;
      if(!errtime) Stop();
   }
   SCL=0;
   Delay();
}

void writebyte(uchar wdata)
{
   uchar i;
   for(i=0;i<8;i++)
   {
       if(wdata&0x80) SDA=1;
       else SDA=0;
       wdata<<=1;
       SCL=1;
       Delay();
       SCL=0;
   }
   WaitACK(); //I2C器件或通讯出错，将会退出I2C通讯

}

uchar Readbyte()
{
   uchar i,bytedata;
   SDA=1;
   for(i=0;i<8;i++)
   {
      SCL=1;
      bytedata<<=1;
      bytedata|=SDA;
      SCL=0;
      Delay();
   }
   return(bytedata);
}

void writeData(uchar address,uchar mdata)
{
   Start();
   writebyte(0xa2);
   writebyte(address);
   writebyte(mdata);
   Stop();
}

uchar ReadData(uchar address)
{ uchar rdata;
   Start();
   writebyte(0xa2);
   writebyte(address);
   Start();
   writebyte(0xa3);
   rdata=Readbyte();
   WriteACK(1);
   Stop();
   return(rdata);
}
void ReadData1(uchar address,uchar count,uchar * buff)
{ uchar i;
   Start();
   writebyte(0xa2);
   writebyte(address);
   Start();
   writebyte(0xa3);
   for(i=0;i<count;i++)
   {
        buff[i]=Readbyte();
        if(i<count-1) WriteACK(0);
   }
  WriteACK(1);
   Stop();
}

void P8563_Read()
{ uchar time[7];
    ReadData1(0x02,0x07,time);
    g8563_Store[0]=time[0]&0x7f;
    g8563_Store[1]=time[1]&0x7f;
    g8563_Store[2]=time[2]&0x3f;
    g8563_Store[3]=time[4]&0x07;
}

void P8563_gettime()
{
    P8563_Read();
    if(g8563_Store[0]==0)
      P8563_Read();
}

void P8563_settime()
{
     uchar i;
     for(i=2;i<=4;i++) { writeData(i,g8563_Store[i-2]); }
     writeData(6,g8563_Store[3]);
}

void P8563_init()
{
    uchar i;
    if((ReadData(0xa)&0x3f)!=0x8)
    {
        for(i=0;i<=3;i++) g8563_Store[i]=c8563_Store[i];
        P8563_settime();
        writeData(0x0,0x00);
        writeData(0xa,0x8);
        writeData(0x1,0x12);
        writeData(0xd,0xf0);
    }
}