What is DDR in AVR? Understanding Data direction registers in AVR Controllers - YouTube
![Solved 1 - General purpose I/O with a Keypad [25 pts] In | Chegg.com](https://media.cheggcdn.com/media/b6b/b6bdfcfe-e51f-4c0a-b8c6-e06e56ba95bf/phpUNfTMh "Solved 1 - General purpose I/O with a Keypad [25 pts] In | Chegg.com")
Solved 1 - General purpose I/O with a Keypad [25 pts] In | Chegg.com
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