Finally I have found how to send messages in plain text, so here is my message again. For those who have read it already, I'm sorry !! Could anybody send me the software for the I2C routines in assembler for a PIC16C63 !! Master Mode!!!!!!!! There are two ways to program the I2C possibilities of the PIC : one by using the SSP module and another one without using the SSP module. If possible could you send me both. The main questions are : Can I use the SSP-module of the PIC16C63 to be the single master of a fully implemented I2C-bus (this means a bus with many slaves !!) If yes, when I move a byte to the register SSPBUF will it be send to the I2C bus without writing any software for it ?? When I can't use the SSP module, is there anybody who can give me the source code for the I2C routines ?? Or give me some clues !! Can somebody help me please, its very urgent !! Greetings from Glenn Goovaerts from Belgium