> But when my Master wants to request data from one of the slaves, do they need to switch (I2C) roles to actually do the transfer? AFAIK, if master wnats data it will READ, so by Master means initiator of request, request itself may be read or write. Dmitriy. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu