void sio3_init(void)
{
  __disable_interrupt();

  // SI/O3 Control register (protect off bevor writing to this register)
  PRCR = 7;

  //Sout3 output, Input-output-port, MSB first, external clock, high output
  S3C = 0xA3;

  //Interrupt control register  (polarity select bit: rising edge, Interrupt Level 6)
  S3IC |= (1<<2) | (1<<1);

  //disable writing to P9 and SI/O3 direction register
  PRCR = 0;

  //Interrupt cause select register select S I/O 3
  IFSR = 0;

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

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

   __enable_interrupt();
}


#pragma vector=SIO3
__interrupt void sio3_handler(void)
{
  //Write 8-Bit Value into Array
  daten[data_counter]=S3TRR;

  //Increment counter
  data_counter++;

  //S3 Transmit/Receive Register reset
  S3TRR = 0x00;

  //toggle P9.3 for time measurement here
  //TIMEPORT ^= (1<<TIMEPIN);
}