A Device Register is the view any device presents to a
programmer.
Each programmable bit in the device is presented with a
logical address
In computing, a logical address is the address at which an item ( memory cell, storage element, network host) appears to reside from the perspective of an executing application program.
A logical address may be different from the physical addr ...
and it appears as a part of a
byte
The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable uni ...
in the device registers. Then programming of these bits can be achieved by reading from or writing to these device registers.
Most devices have at least these two device registers:
# Data Register: to which the data to be input/output is read from/written to the device.
# Control/Status: Which selects/shows the mode of operation of the device.
Digital registers
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