Shift Registers and Counters

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Section 7.8 Shift Registers and Counters

Having established the behavior of flip-flops, we move on to applications that make use of these circuit elements. In particular, we will examine shift registers and the counters that are based on them.

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Subsection 7.8.1 Shift Registers

Let’s examine a circuit that is called a shift register. An example of a shift register circuit is provided in Figure 7.8.1

Figure 7.8.1. Shift register circuit constructed using four D flip-flops that are each triggered by the falling edge on the clock signal $C\text{.}$
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In this circuit, the input signal (In) is assumed to be controlled by some external source (another circuit or a person) and the signal can change between high and low at any time.

Figure 7.8.2.

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