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Experiment 12 - The 2-bit UP/DOWN Counter

Take a look at the circuit diagram. You recognize the synchronous counter and the logic gates that form the new input UP/DOWN...

Circuit diagram 2-bit UP/DOWN counter.

Illustration states 2-bit UP/DOWN counter.

When UP/DOWN = 0, the counter counts down...

When UP/DOWN = 1, the counter counts up...

Circuit 2-bit UP-DOWN counter. (Enlarge)

The circuit looks complicated. However, it only ensures that either Q or Q' is passed to the next flip-flop.

In the next experiment you build a 4-bit UP/DOWN counter...