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Add a Glossary appendix page #223

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@@ -46,3 +46,7 @@ more information and coordination
- [A little Rust with your C](./interoperability/
- [Unsorted topics](./unsorted/
- [Optimizations: The speed size tradeoff](./unsorted/


[Appendix A: Glossary](./appendix/
@@ -0,0 +1,16 @@
# Appendix A: Glossary

The embedded ecosystem is full of different protocols, hardware components and
vendor-specific things that use their own terms and abbreviations. This Glossary
attempts to list them with pointers for understanding them better.

Term | Meaning
I2C | Sometimes referred to as `I² C` or Inter-IC. It is a protocol meant for hardware communication within a single integrated circuit. See [] for more details
SPI | Serial Peripheral Interface
USART | Universal synchronous and asynchronous receiver-transmitter
UART | Universal asynchronous receiver-transmitter
FPU | Floating-point Unit. A 'math processor' running only operations on floating-point numbers
PAC | Peripheral Access Crate