The RISC-V Reader is a concise introduction and reference for embedded systems programmers, students, and the curious to a modern, popular, open architecture. RISC-V spans from the cheapest 32-bit embedded microcontroller to the fastest 64-bit cloud computer. The text shows how RISC-V followed the good ideas of past architectures while avoiding their mistake. Highlights include: - Introduces the RISC-V instruction set in only 100 pages, including 75 figures - 2-page RISC-V Reference Card that summarizes all instructions - 50-page Instruction Glossary that defines every instruction in detail - 75 spotlights of good architecture design using margin icons - 50 sidebars with interesting commentary and RISC-V history - 25 quotes to pass along wisdom of noted scientists and engineers Ten chapters introduce each component of the modular RISC-V instruction set--often contrasting code compiled from C to RISC-V versus the older ARM, Intel, and MIPS architectures--but readers can start programming after Chapter 2.