RISC-V for Arm Developers
Everything in this folder so far has described one architecture. The reason that is a reasonable way to spend eleven pages is that Cortex-M is what the overwhelming majority of microcontroller work is written against. The reason it is not the only thing worth knowing is that RISC-V parts are now genuinely shipping in volume — the ESP32-C3 in a hobbyist's hands, the CH32V003 at ten cents, the RISC-V management cores inside SoCs whose application processors are Arm — and the transition is much easier than a new instruction set sounds, provided you know which of your Cortex-M assumptions are architectural and which are Arm's.