I'm very new and I can't find a good explanation for understanding the relationship between physical pin numbers and actual pin names.
For example, I'm looking at a Leonardo schematic, physical pin 32 shows its pin modes as "(ICP3/CLK0/OC4A)PC7" with a given pin name of "IO13*". I can't for the life of me figure out why calling that pin "IO13*" makes any sense and where that correlation is made. It confuses me to see something like pinMode(13,OUTPUT); that's referring to IO13* not the actual 13th pin.
Furthermore, lets say I want to use physical pin 9, named "SCLK" in the Leonardo schematic, as a digital output. I'm not sure how to relate pin 9 to being a digital IO so I can pass it into the function pinMode();
Thank you for any help!
Here's a link to the Leonardo schematic for reference. http://arduino.cc/en/uploads/Main/arduino-leonardo-schematic_3b.pdf