Problem mit WIZ812MJ!

void write_data_wiznet(int registers, unsigned int data) {

   unsigned int address_l = 0;

   unsigned int address_h = 0;

   address_l = get_AddressL(registers);

   address_h = get_AddressH(registers);

   SPI &= ~SCS;  // SCS low setzen -> Wiznet enabled  

   //WIZNET &= ~CS;  // CS low setzen -> Wiznet enabled   

   //_delay_us(5); 

   write_spi(WIZNET_WRITE);

   write_spi(address_h);

   write_spi(address_l);

   write_spi(data);

   //WIZNET |= CS;   // CS high setzen -> Wiznet disabled

   SPI |= SCS;   // SCS high setzen -> Wiznet disabled

   //_delay_us(5); 

}

void init_spi() {

   // MISO -> input; MOSI -> output; SCK -> output; SS -> output

   SPI_DDR = 0xB0;

   SPI |= SCS;  //set 

   //SPI control register

   SPCR = 0x50;

   //SPI status register

   SPSR = 0x00;

   //SPI data register

   SPDR = 0x00;  

}

void init_wiznet() {

    // hardware reset

   WIZNET |= RESET;  //set

   _delay_ms(10);   

   WIZNET &= ~RESET;  //reset

   _delay_ms(30);     

   WIZNET |= RESET;  //set

   // register reset

   write_data_wiznet(MR, 0x80);

   // set gateway ip address 

   write_data_wiznet(GAR0, 192);

   write_data_wiznet(GAR1, 168);

   write_data_wiznet(GAR2,   0);

   write_data_wiznet(GAR3,   1);

   // set subnet mask 

   write_data_wiznet(SUBR0, 255);

   write_data_wiznet(SUBR1, 255);

   write_data_wiznet(SUBR2, 255);

   write_data_wiznet(SUBR3,   0);

   // set mac address 

   write_data_wiznet(SHAR0, 0x00);

   write_data_wiznet(SHAR1, 0x08);

   write_data_wiznet(SHAR2, 0xDC);

   write_data_wiznet(SHAR3, 0x01);

   write_data_wiznet(SHAR4, 0x02);

   write_data_wiznet(SHAR5, 0x03);

   // set own ip address 

   write_data_wiznet(SIPR0, 192);

   write_data_wiznet(SIPR1, 168);

   write_data_wiznet(SIPR2,   0);

   write_data_wiznet(SIPR3,  10);

}