> In general speaking... are there any major differences from 16Cxx Vs. 16Fxx > code? No. It's the same instruction set. Of course there are differences in peripherals between PICs, and obviously the 16C won't have features resulting directly from flash. Other than possibly modifying the config bits, code for a 16C should run on a 16F with the same peripheral set and pinout. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics