> >>To use I2C master mode, you have to do every bit change in software, >>so you can use every other PIC. >> >Are you suggesting that you cannot use the i2c control registers to perform >output of data and interrupt on receive etc while acting as a master? >I can see that you would have to generate Sr, St and NACK yourself for bus >master control purposes but cannot see a problem with the general data >transmission to and fro. >Cheers At least in the I2C mode, the SSP would not generate a clock signal, so the data won't come out. Somebody else in the PICLIST proposed to switch to SPI mode, to act as an I2C master. Might work, but then, the slaves couldn't do clock stretching and so on. Would only be a crude imitation of I2C. regards, Wolfram +-----------------------------------------------------+ | Wolfram Liebchen | | Forschungsinstitut fŸr Optik, TŸbingen, Deutschland | | mailto:liebchen@ffo.fgan.de | +-----------------------------------------------------+