Your choice is 18cxxx or use 10 MHz crystal with PLL enabled more instruction more power. By the way 18cxxx can't run 40 MHz on extended temp range the limit is 25 MHz unless you have external 40 MHz clock. I personally like 18cxxx better then any of 16. Andre Abelian I would to work with a pic similar to 16F84 or 16F87X, but at 40MHz Wallace do Valle Barros -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.