Pull up resistors help ensure that the digital input can be interpreted as either high or low, even when the pin is disconnected. Most often we put them on the outside of a processor, but for reasons of cost and convenience we may activate the internal pull-ups on a processor input pin.
These particular slides correspond to Chapter 4 of the textbook, "The AVR Microcontroller and Embedded Systems Using Assembly and C: Using Arduino Uno and Atmel Studio."
The original slides and the main reference book can be found by the original author, Sepehr Naimi. See his website, nicerland.com, as well as co-author's website: www.microdigita...
The slides are used with permission. They have been updated by James Smith to reflect the way he teaches EECS 2021 at York University.
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