:: It also says "All instructions are single cycle (200 ?s) :: except for program branches, which take two cycles" The data sheet on page 3 definitely says: Operating Speed: DC - 20 MHz crystal oscillator DC - 200ns instruction cycle Colin -- cdb, colin@btech-online.co.uk on 8/07/2009 Web presence: www.btech-online.co.uk Hosted by: www.1and1.co.uk/?k_id=7988359 -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist