void I2C_INI ()
{


 SSPEN = 1;
 SSPM3 = 1;
 SSPM2 = 0;
 SSPM1 = 0;
 SSPM0 = 0;
 SSPCON2 = 0;
 SMP = 0;
 CKE = 0;
 SSPADD = 10;


}

void I2C_IDLE ()
{
 while (SSPSTAT.2 == 1);
 while ((SSPCON2 & 0x1F) > 0);
}

void I2C_FERTIG ()	
{
 while (SSPIF == 0);	
 SSPIF = 0;
}

void I2C_BUS_START ()		// Start - Bit
{
 SEN = 1;
 while (SEN);
}

void I2C_BUS_START_rep ()	// 
{
 RSEN = 1;
 while (RSEN == 1);
}

void I2C_BUS_STOPP ()		// Stopp - Bit
{
 I2C_IDLE ();
 PEN = 1;
 while (PEN == 1);
}

void I2C_ACK ()
{
 ACKDT = 0;
 ACKEN = 1;
 I2C_FERTIG ();
}

void I2C_NACK ()
{
 ACKDT = 1;
 ACKEN = 1;
 I2C_FERTIG (); 
}


void I2C_W (char x)		// Daten schreiben
{
 SSPIF = 0;	
 SSPBUF = x;
 while (SSPIF == 0);
}

void I2C_R ()			// Daten lesen
{
 RCEN = 1;			// PIC soll den Takt erzeugen
 while (RCEN);
 ACKEN = 1;
 while (ACKEN);
 
 I2Cempfang = SSPBUF;		
}



void RTC_INI ()
{

 I2C_BUS_START ();
 I2C_W (0xA0);		// zum lesen adressieren
 I2C_W (0x00);		// Adresse im pcf 8583
 I2C_W (0x80);		// 0 in das register schreiben
 I2C_BUS_STOPP ();

 I2C_BUS_START ();
 I2C_W (0xA0);		// zum lesen adressieren
 I2C_W (0x02);		// Adresse im pcf 8583
 I2C_W (0x00);		// 0 in das register schreiben
 I2C_BUS_STOPP ();

 I2C_BUS_START ();
 I2C_W (0xA0);		// zum lesen adressieren
 I2C_W (0x00);		// Adresse im pcf 8583
 I2C_W (0x00);		// 0 in das register schreiben
 I2C_BUS_STOPP ();


}

void RTC_auslesen ()
{
 I2C_BUS_START ();
 I2C_W (0xA0);		// Adresspointer auf die auszu-
 I2C_W (0x02);		// lesende adresse stellen
 I2C_BUS_START_rep ();
 I2C_W (0xA1);		// zum lesen adressieren
 I2C_R ();		// Daten vom bus einlesen
 I2C_NACK ();
 sek = I2Cempfang;
 I2C_BUS_STOPP ();
}


//*************************************************

void sek_umrechnen ()
{
 if (sek.0 == 1)
 {
  ze6 = '1';
 }

 if (sek.1 == 1)
 {
  ze6 = '2';
 }

 if (sek.0 && sek.1 == 1)
 {
  ze6 = '3';
 }

 if (sek.3 == 1)
 {
  ze6 = '4';
 }

 if (sek.3 && sek.0 == 1)
 { 
  ze6 = '5';
 }

 if (sek.3 && sek.1 == 1)
 {
  ze6 = '6';
 }

 if (sek.3 && sek.0 && sek.1 == 1)
 {
  ze6 = '7';
 }

 if (sek.4 == 1)
 {
  ze6 = '8';
 }
 if (sek.4 && sek.0 == 1)
 {
  ze6 = '9';
 }
if (sek.0 && sek.1 && sek.2 && sek.3 && sek.4 == 0)
 {
  ze6 = '0';
 }
}


void main ()
{
PIC_INI ();
I2C_INI ();
RTC_INI ();

while (1)
{
RTC_AUSLESEN ();
sek_umrechnen ();
LDC_AUSGABE ();
}

}