Hiya, I am using the 16C77 and trying to use the SSP in master mode. Does the PIC actually do anything for me? I set the mode in SSPCON and setup the TRISC ports as inputs, stuffed a value into SSPBUF and nothing happened (got LEDs on the output. Is there anything else I should be doing (i.e. how do you set the 100khz or 400kHz rate) or is the firmware master mode as much use as a manager in a crisis (i.e. I have to do all the work myself and bit-bang it?) If I have to do this, how tolerent is the I2c bus of other things happening? I will be having a number of other interrupts going off at the same time, so this could delay any software implementation. Cheers Catchy..