The control unit segregates the computer into a characteristic model of its own kind. Mostly used in relation to fetch
cycles, it examines instructions
stored in a particular program
, and causes them to be obeyed in the apposite sequence.
This allows computers the ability to be self-operational
, in that, having been presented with a set of instructions, known as the program, the computer can execute the instructions with no further need for human intervention, until of course the program requests interactive input
. In obeying these instructions, the control unit is in two-way communication
with all other devices.