Micros generally are great. You gey a good (high level) understanding of registers because you're interacting with them all the time in normal code. Pretty much

Micros generally are great. You gey a good (high level) understanding of registers because you're interacting with them all the time in normal code. Pretty much everything you do with a microcontroller involves setting a bit in some register, and as you say, that register is really an address (this is usually eaiser to grok when reading values from an attached sensor that requires sending a memory offset). Also the instruction set tends to be quite small. I'd recommend starting with something like AVR though, a bit easier to get going than ARM.