I am currently trying to implement an IIC master mode routine for the '64. I have a software routine which works fine, but slowly. To speed things up I thought the hardware would help me out, but according to the data sheet then in master mode the only support is for start and stop bit interrupts to see if anyone else is using the bus. Control of the bits is only through the TRISC register, ignoring the port values, and presumably the fast serial register. Does anyone know if the only way to use this port is in software for master mode ? robin.abbott@dial.pipex.com