Special Counter/dividers
The last two chapters looked at D-type and JK flip-flops and showed how they are used in various ‘up’-counting counter/divider ICs. The present chapter rounds off this subject by looking at some of the special types of digital counter/divider ICs that are available, including ‘presettable’ and ‘down’- and ‘up/down’- counting types.
Directional Control
Chapter 10 explained how D-type and JK flip-flops work and described how a D-type can be made to act as a binary divider (divide-by-2) stage by connecting its D and NOT-Q terminals together as shown in Figure 12.1(a), and a JK-type can be made to act in the same way by tying its J and K terminals to logic-1 as shown in Figure 12.1(b). Note from the symbols of these ...
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