![]() To add to the complexity pins can have more than one fuction and be labeled multiple names. If pin 0 was located on Port A the name would look something like PA0 ( Port A pin 0) PB0 (in the above datasheet) just means pin 0 is located on Port B of the Chip. Each port has a number of pins which are labeled 0,1,2,3 etc and stick out on different parts of the chip which is why a microcontroller's physical pin often time will be different than the pin number used when programming the chip. Pins are gathered into groups called "ports" these ports are labeled A,B,C etc. The manufacturer of the ATtiny85 is ATMEL (the AT in ATtiny85-actually stands for ATMEL) It's common for chips to have the first two initials of the company who makes them. ![]() Pin numbers used to program a chip on the Arduino IDE are based on how the chip manufacturer has internally named/aranged the pins. ![]() Before the connections are made there is a very important fact to know how pins on microcrontrollers/ICs are labeled. ![]()
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