PIC18F2680 - EEPROM Daten nach Reset weg

void main (void)

{

    ...

    WriteEEPROM(0,1,0xDE);

    temp = ReadEEPROM(0,1);

    ...

}

unsigned char ReadEEPROM(unsigned char addressh, unsigned char address)

{

    EECON1=0;                   //ensure CFGS=0 and EEPGD=0 

    EEADR = address;

    EEADRH = addressh;

    EECON1bits.RD = 1;

    return(EEDATA);

}

void WriteEEPROM(unsigned char addressh ,unsigned char address,unsigned char data)

{             

    EECON1=0;                   //ensure CFGS=0 and EEPGD=0

    EECON1bits.WREN = 1;        //enable write to EEPROM

    EEADR = address;            //setup Address

    EEADRH = addressh;

    EEDATA = data;              //set data

    //required sequence according to datasheet

    EECON2 = 0x55;              

    EECON2 = 0xaa;              

    EECON1bits.WR = 1;          //initiate write cycle

    while(!PIR2bits.EEIF);      //wait until finished

    EECON1bits.WREN = 0;        //end write cycle

    PIR2bits.EEIF = 0;      //clearing write operation flag bit    

}