dear all, i m interfacing 24c16an with c8051f120. i have sck and sda on p0.6 and p0.7 when i dont enable the crossbar for smbus, these lines toggle as normal port pins but when i enable the crossbar that time my smb0cr register is configured at 100Khz i.e i m using communication at 100Khz but still i notice that SCK line doesnot toggle as clock line it is steady at 3V i.e supply to ic. i check the hardware, there is no short to any supply i did P0 = 0xff as initialisation, and made then open drain. but still the sck line is steady, no clock seen on it. due to this i get NAK and my communication stops pls suggest the solution. in case any doubts pls let me know thank you all