> The minimum wait time for programming one location of a > 16F877 is 4mS. DS30262C page 15: program cycle time Max 10 ms DS39025D page 3-179: program cycle time Max 5 ms The first document was the first one to describe 16f877 programming, but it lumps the chip together with the 16x8x chips. Olin, do you have a reference somewhere that DS30262C is no longer valid for 16f877? Wouter van Ooijen -- ------------------------------------------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.