Hmmm, I see what you mean. Pages 72 and 83 seem to contradict, although I have to be honest and say I haven't used Synch mode and so not noticed that discrepancy before. It's possible that there's an error in the datasheet (wouldn't be the first) http://www.microchip.com/download/lit/suppdoc/errata/80073d.pdf mentions only that ADEN should be spelled ADDEN. I guess it's 50:50 which page you believe until you try it. I've got a small project that will use inter-PIC comms but that's not due to be done for a few days yet. I'll be interested if anything is found out that will affect that job. Keep in touch please -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads