void int1_init(void)
{
#if MULLE_BOARD

  __disable_interrupt();
  //interrupt control register  (polaritiy select bit: faling edge, Interrupt Level 1)
  INT1IC |= 0x01;
  INT1IC &= 0xC9;
  //reset interrupt request bit
  INT1IC &= 0xF7;
  //Interrupt request cause select register (int pol. switching bit: one edge)
  IFSR &= 0xFD;
  puts("INT1 initialized.\n");
  __enable_interrupt();

#endif //MULLE_BOARD
}
//------End Initialize INT1----------------------------------------


//-------INT1 Interrupt Service Routine----------------

#pragma vector=INT1
__interrupt void int1_handler(void)
{
  //only for testing
  printf("INT1 int %d\n", data_counter);

  //receive 8 Bit every time an INT1 Interrupt occurs
  //Transmit/receive data starts after setting transmitting data in SI/O3 transmit/receive register
  S3TRR = S3TRR;

  //reset  interrupt request bit
  INT1IC &= 0xF7;

  // Simon:
  // SI/O3 Interrupt request bit setzen ?
  // zum aufruf von SI/O3 ISR aufgerufen
  S3IC |= (1<<3);
}
//--------End INT1 Interrupt Service Routine------------------------------------


/*------------------------------------------------------------------------
  SIO3 Init added/changed by 
  ----------------------------------------------------------------------*/
void sio3_init(void)
{
#if MULLE_BOARD
  __disable_interrupt();
  /*------------------------------------------------------------------------\
  | SI/O3 Control register (protect off before writing to this register)    |
  |//Sout3 output, Input-output-port, MSB first, external clock, high output|
  \------------------------------------------------------------------------*/
  // setting up configuration  ----------------------------------------------
  //PROTECT OFF
  PRCR = 7;

  S3C |= 0xA0;
  //S3BRG must not be set, Transfer Bitrate is determined by ext. clk from ECK Chip !

  // Interrupt behaviour --------
  //Interrupt control register  (polarity select bit: rising edge, Interrupt Level 6)
  S3IC = 0x06;
  //in Interrupt cause select register: select SI/O3
  IFSR = 0x00;

  //reset Interrupt request bit for SI/O3
  S3IC &= ~(1<<3);

  //PROTECT ON
  PRCR = 0x00;
  //Transmit/receive data starts after setting transmitting data in SI/O3 transmit/receive register
  //S3TRR = 0x00;

  puts("SI/O3 initialized.\n");
  __enable_interrupt();

#endif //MULLE_BOARD
}



/*------------------------------------------------------------------------
  SIO3 ISR added/changed by 
  ----------------------------------------------------------------------*/
#pragma vector = SIO3
__interrupt void sio3_handler(void)
{
  //only for testing
  printf("SIO3 int %d\n", data_counter);

  //save S3TRR content in daten Array
  daten[data_counter] = S3TRR;
  //increment array
  data_counter++;

  //reset Interrupt enable bit to 0
  S3IC &= ~(1<<3);
}