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Device Registers as a Chip's Control Panel

A device register is one small slot of storage inside a piece of hardware, usually a few bytes wide, that the chip watches. Writing to one is how you push a button on the device; reading one is how you check a dial. A card has a documented list of these slots, and a driver does essentially nothing else: it reads and writes registers in the right order.

Questions this Concept answers

Why is a device's documented register list effectively the whole interface a driver programs against?

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Memory-Mapped I/O for ARM Cortex-M Microcontrollers

Memory-mapped I/O is a technique in which a peripheral device's control, status, and data registers are assigned addresses within the processor's normal memory address space, allowing the CPU to inte…