>> Do unused inputs really need to be connected to ground? What is the effect if they are not grounded? Does it affect operation of the PIC? << This has been beaten to death several times. Check the archive. I leave unused pins open and set them as outputs. I usually tie unused input-only pins to ground. ***************************************************************** Olin Lathrop, embedded systems consultant in Devens Massachusetts (978) 772-3129, olin@embedinc.com, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.