If you hotplug something into something that is not designed for it w/o a controller you will likely glitch the other items in the target. Use a hotplug controller or design all your interface lines very carefully. Also consider what can go wrong. Peter -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads