用最通用的PIC16F877 硬件I2C 要分四次写入和读出这个数据， 请看下面的source code
#define uint unsigned int
#define ulong unsigned long
uint Databuf1, Databuf2;
ulong Databuf;
void Write_AT24C02(uchar WriteAddr,uchar Databuf)
{
SEN=1;
while(SEN==1);
SSPIF=0;
SSPBUF=0xA0;
while(SSPIF==0); //?¡à|ì?¡¤¡é?¨a¨a¨o¡à??a?1
SSPIF=0;
SSPBUF=WriteAddr;
while(SSPIF==0);
SSPIF=0;
SSPBUF=Databuf;
while(SSPIF==0);
SSPIF=0;
PEN=1;
while(PEN==1);
SSPIF=0;
}
unsigned Read_AT24C02(uchar Addr)
{
unsigned char buf;
SEN=1;
while(SEN==1);
SSPIF=0;
SSPBUF=0xA0;
while(SSPIF==0);
SSPIF=0;
SSPBUF=Addr;
while(SSPIF==0);
SSPIF=0;
RSEN=1;
while(SSPIF==0);
SSPIF=0;
SSPBUF=0xA1; //¡¤¡é?¨aAT24C02|ì??¡Â?t|ì??¡¤o¨a?¨￠D?o?
while(SSPIF==0); //?¡à|ì?¡¤¡é?¨a¨a¨o¡à??a?1
SSPIF=0; //??SSPIF¡à¨o????
RCEN=1; //¨|¨¨???¨￠?¨oD¨a
while(SSPIF==0); //?¡à|ì?¡¤¡é¨a¨o?a?1
buf=SSPBUF; //?¨￠3?¨oy?Y¡¤?¨¨?buf?D?Y¡ä?
ACKDT=1; //?¡ä¨¨¡¤¨¨?¨oy?Y??
ACKEN=1; //¡¤¡é?¨a¨®|¡äeD?o?
while(SSPIF==0); //?¡à|ì?¡¤¡é?¨a¨a¨o¡à??a?1
SSPIF=0; //??SSPIF¡à¨o????
PEN=1; //2¨2¨|¨2IIC¨a¡ê?1D?o?
while(PEN==1); //?¡à|ì?¨a¡ê?1?a?1
SSPIF=0; //??SSPIF¡à¨o????
return(buf); //???¨￠3?¨oy?Y¡¤|ì??
}
Write_AT24C02(0x00,0xff);
Write_AT24C02(0x01,0xff);
Write_AT24C02(0x03,(98888-65536)/256);
Write_AT24C02(0x04,(98888-65536)%256);
Databuf1=Read_AT24C08(0x00);
Databuf1=Databuf<<8|Read_AT24C02(0x01);
Databuf2=Read_AT24C08(0x03);
Databuf2=Databuf<<8|Read_AT24C02(0x04);
Databuf=Databuf1|Databuf2;
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