Bob Axtell wrote: > But powerup does NOT place > the device in a known state. > > ... > > If the SDA cannot be freed after 9 clocks, you either have > another master driving the bus, or you have a defective i2c device on > the bus. Or what if a device powers up in the clock stretch slave state? If the power up state is truly unknown (where did you see this?) then how do you know it isn't holding clock low, in which case you can't clock the bus and can never enter normal operation? ****************************************************************** Embed Inc, Littleton Massachusetts, (978) 742-9014. #1 PIC consultant in 2004 program year. http://www.embedinc.com/products -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist