APPENDIX B

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A Digital Electronics Primer

Microcontroller units (MCUs) are great big blocks of digital electronic circuitry, but they still obey the basics of digital electronics. I’d like for us to take a short walk through these basics in this appendix. As we go through this, we’ll also be using a “breadboard”—which I explain in Appendix C.

This appendix aims to provide a basic introduction to digital electronics. It doesn’t cover the whole subject (which is vast), and it won’t make you into an instant expert on the subject. However, it should cover enough of the groundwork for you to understand the material presented throughout this book.

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