> Could it be a silicon bug? e.g. divisor not providing the correct > clocks in the F88. This doesn't make sense. There is no internal clock in a slave. In fact the clock rate register is re-used for something else in slave mode if I remember right, like the slave address. It's been a long time since I used hardware IIC on a PIC because of all the problems. My first answer is don't design a system around IIC using PIC hardware. ***************************************************************** Embed Inc, embedded system specialists in Littleton Massachusetts (978) 742-9014, http://www.embedinc.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist