signals which are delivered from another circuit at a fast and regular rate,
typically 8 to 50 million times per second. Each instruction is carried out in
steps,
with one step for each clock pulse, and the action of the program
counter register is to add 1 to its address number at the last clock pulse of
each instruction. In this way, if the register starts at 0, then after one
instruction has been completed its address number is 1, after the second
instruction it is 2 and so on. The fast rate of the clock pulses means that the
program counter will have cycled through all of its possible addresses in a
very short time. Fo
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