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Registers as types is something I've never seen attempted, it feel= s >> strange and unnecessary, and just worries me. > > Do you want to go back to lots of defines, manual masking and shifts rath= er than > having a single obvious definition of a register that generates a type wi= th > getters and setters? Needless to say that the former is much more error p= rone > and less readable. :) Elimination of manual masking and shifts don't require a nominal type syste= m :) I can imagine use cases where a interrupt-enabled register and interrupt-pe= nding register has identical bitfields, and you might want to use the same type f= or interrupt enabled and interrupt pending registers and might even want to us= e bitwise operations between them :) Ultimately bitfields types and register-as-types are all or nothing. Best, Gary