The three approaches above (I/O Read/Write, System Registers and Memory-Mapped I/O) all get us single usize sized units of data. However, hardware designers consider these registers to be a precious resource, and using a whole 32-bit value to simply record "Is this peripheral On or Off right now" is quite wasteful. That kind of information only requires a single bit, and there are 32 (or 64) bits in an integer. So, the designers like to pack as many different small values into a single integer as possible. Here's an example - the Interrupt FIFO Level Select Register, UARTIFLS for the Arm PL011 UART:
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