Home › Forums › Microcontrollers › PIC Microcontroller › port extenderThis topic contains 3 replies, has 2 voices, and was last updated by Ligo George 4 years, 10 months ago.Log In Register Lost PasswordViewing 4 posts - 1 through 4 (of 4 total)Author PostsJuly 18, 2014 at 4:42 am #8960 PNParticipanton MCP23017 , pin13,SDA should be connected to which pin of PIC18f4550?July 18, 2014 at 5:58 am #8961 Ligo GeorgeKeymasterMCP23017 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=56536You 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 PNParticipantHi, 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 GeorgeKeymasterNo, it will not work.. you need to develop codes for IC 23017.Author PostsLog In Register Lost PasswordViewing 4 posts - 1 through 4 (of 4 total)You must be logged in to reply to this topic.