Home › Forums › Microcontrollers › PIC Microcontroller › port extender This topic contains 3 replies, has 2 voices, and was last updated by Ligo George 3 years, 5 months ago. Log In Register Lost Password Viewing 4 posts - 1 through 4 (of 4 total) Author Posts July 18, 2014 at 4:42 am #8960 PNParticipant on MCP23017 , pin13,SDA should be connected to which pin of PIC18f4550? July 18, 2014 at 5:58 am #8961 Ligo GeorgeKeymaster MCP23017 will not work with MikroC Port Expanding Library.. You need to develop your own library functions.. This link might help you : http://www.mikroe.com/forum/viewtopic.php?f=97&t=56536 You can connect SCL and SDA to PIN 34 and 33 respectively. Please refer the datasheet of 18F4550. October 1, 2014 at 12:08 pm #8872 PNParticipant Hi, i tried a prog using port extender IC 23S17 and worked fine. but i want to test it practically and i have IC 23017 available with me will it work? its Pin config is different.. October 3, 2014 at 1:14 pm #9369 Ligo GeorgeKeymaster No, it will not work.. you need to develop codes for IC 23017. Author Posts Log In Register Lost Password Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.