unsigned char IicBusRead(IicPack *IicData)
{
 unsigned char i,ret;

 /* Ramdom Read Cycle / Sequential Ramdom Read Cycle */
 IicData->iic_DeviceAddress &= 0xFE;      /* WRITE Setting Device Address */
 StartCondition();          /* Start Condition */
 while (1) {
  if ((ret=ByteWrite(IicData->iic_DeviceAddress)) == NOACK) /* WRITE Device Address */
   break;           /* NoAck Detect */
  if ((ret=ByteWrite(IicData->iic_MemoryAddress)) == NOACK) /* WRITE Memory Address */
   break;           /* NoAck Detect */
  IicData->iic_DeviceAddress |= 0x01;     /* READ Setting Device Address */
  StartCondition();         /* ReStart Condition */
  if ((ret=ByteWrite(IicData->iic_DeviceAddress)) == NOACK) /* WRITE Device Address */
   break;           /* NoAck Detect */
  for (i=1; i<IicData->iic_NumberOfByte; i++) {  /* specified bytes as loop */
   ByteRead(IicData->iic_Data, ACK);    /* Read data (Ack output) */
   IicData->iic_Data++;       /*  */
  }
  ByteRead(IicData->iic_Data, NOACK);     /* Read data (NoAck output) */
  break;
 }
 StopCondition();          /* Stop Condition */
 return(ret);
}

这是瑞萨网上的一个iic例程.
在这个例程中,  "->"  这个表达式是表示什么
IicData->iic_DeviceAddress &= 0xFE;      /* WRITE Setting Device Address */