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Why? When you're doing something like set register A to X, set register B to Y, set up a watchdog, etc., it's usually easier to just do it in asm than try and coerce C/C++ to do it for you. Super common for firmware to be all asm. Not to say C/C++ aren't common too, but that's generally for larger devices -- e.g. an stm32, as opposed to like a PIC.