title: setting pins on various ports in gpio LM3SD96
body: <p>I want to set a few pins in GPIO ports PA, PD, and PF on a Stellaris LM3S9D96.</p>
  
  <p>I know the bit operation procedures needed to that, but I am confused on how to select different pins in ports PA, PD, etc. and <code>AND</code> them with appropriate masks. Could someone explain these operations to me?</p>