I'm thinking about connecting an output pin on an ATTiny85 to a an external interrupt pin on the ATMega328p.
Two questions: 1. Thinking about directly connecting the ports and then using OUTPUT mode on the Tiny and INPUT_PULLUP on the 328. Any problems with this setup?
- Currently this is one way, Tiny signalling to the 328. If in the future I want to make this bi-directional (i2c for example), would I need an external pull-up resistor between the two?