SparkFun Forums

[ohnoitsaninja]

Hello, I need an 8 bit wide PORT, and PORTD is already used up with serial and a hardware interrupt on port2. PORTB is too small. My understanding is that A6 and A7 on the redstick should be accessible through PORTC however my testing shows PORTC only going from A0-A5 like an Uno. Any chance an easy modification somewhere could fix this? I'm uploading to the redstick in the arduino IDE under Uno/Genuino, could it be as easy as changing this to something else?

edit: Selecting pro mini uploads but has no difference. I've since found documentation saying A6 and A7 on redstick are analog only. Is there simply no way to have an 8-bit wide port and a hardware interrupt?

[MonsterBot]

No. That is limited in hardware. You'll have to combine it with two other pins to get 8-bits or you can also use a SIPO IC such as a 595 (which would only require 3 pins).