#define uchar unsigned char
sbit  DS1302_CLK = P2^4;              //實時時鐘時鐘線引腳 
sbit  DS1302_IO  = P2^5;              //實時時鐘數據線引腳 
sbit  DS1302_RST = P2^3;              //實時時鐘復位線引腳


void write_1302(uchar data_1302)//向1302中寫入一個字節
{
	uchar i;
	for(i=0;i<8;i++)
	{
		DS1302_IO=(bit)(data_1302&0x01);
		DS1302_CLK=1;
		DS1302_CLK=0;
		data_1302>>=1;
	}
}

uchar read_1302(void)		//從1302中讀取一個字節
{
	uchar i,data_1302;
	for(i=0;i<8;i++)
	{
		data_1302>>=1;
		if(DS1302_IO)
		{
			data_1302|=0x80;
		}
		DS1302_CLK=1;
		DS1302_CLK=0;
	}
	return (data_1302);
}


//讀出1302的時間序列
void read_serial(uchar j[8])
{
	uchar i;
	DS1302_RST = 0;
	DS1302_CLK = 0;
	DS1302_RST = 1;
	write_1302(0xbf);//0xbf為連續讀出的命令代碼
	for(i=0;i<8;i++)
	{
		j[i] = read_1302();
	}
	DS1302_CLK = 1;
	DS1302_RST = 0;

}

//寫入1302的時間序列
void write_date_time(uchar j[8])
{
	uchar i;
	DS1302_RST = 0;
	DS1302_CLK = 0;
	DS1302_RST = 1;
	write_1302(0xbe);//0xbe為連續寫入的命令代碼
	for(i=0;i<8;i++)
	{
		write_1302(j[i]);
	}
	DS1302_CLK = 1;
	DS1302_RST = 0;
}