I have designed a custom board using the Atmega328 from Sparkfun. It "talks to other hardware using a latched parallel port or register. All seems well except for bit0 and bit1 appear stuck. I realize they are RX and TX on an Arduino, but I know they can be used as digital I/O also. Some googling a…

Using pin 2 and 3 as digital I/O

Topic		Replies	Views
Programming the 328 3rd Party Boards	26	8027	May 6, 2021
23 I/O ATmega328 Hardware	13	4290	May 7, 2021
full 23 i/o pins on atmega328 3rd Party Boards	9	7070	May 6, 2021
digitalWrite pins 0 and 1 Troubleshooting	8	6872	May 6, 2021
Using ATmega328 PB6 and PB7 as digital pins? Programming	11	17194	May 5, 2021