> Can serial coms work, even at a slow speed, by bit banging when the crystal is > 32 kHz? Sure, as long as the bit rate is slow enough. You should be able to do 300 baud. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.