The address the part answers to.
How many transfers the part has served.
Marks bits of one register as the part's to set: a driver's write leaves them as the part holds them.
Puts a value in one register, read-only bits included, the way the part itself would.
What one register holds now, which is what a driver wrote there apart from the read-only bits.
A part that is not there, answering from 256 registers sixteen bits wide.
A pointer byte names a register and a register travels most significant byte first. A write of the pointer alone aims the next read; a write of the pointer and a word stores the word; a read takes words from the pointer on. Bits the part sets for itself, such as a conversion-ready flag, are marked with
readOnlyand keep the part's value whatever a driver writes.