title: The use of CPOL/CPHA settings in SPI communication
body: <p>Could any one please give me real life examples where the 4 modes of CPOL/CPHA configuration in SPI communication are useful? I understand how they work but fail to know when to use them. I have read some refer shortly for compatibility purposes due to non-standard implementations, how is this so?</p>
  
  <p>Thanks</p>