I was intrigued by the low price so I purchased a so-called Pro Mini EVB board which is based on the SSOP20 version of the LGT8F328P . What puzzles me most is that some pins (i.e. 3/4, 8/9 and 10/11) are shared somehow. I've been using Nano and Pro Mini clones for years, but this is the first time I come across shared pins. Could someone tell me how can I use, say, pins 3 and 4 as digital inputs at the same time? Or pins 8 as input and 9 as an output?
Thanks in advance,