IIRC (has been a long time) it takes a few AVR instructions to set or celar a single output pin (also to decide on the value of a single pin?) Wouter > Why would you say that AVR is no a leader in I/O intensive > operations ? -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads