User manual

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Fig. 59: A four LED flash
21 Synchronous Counter
A multi-stage synchronous counter generally delivery the same results
as a multi-stage ripple counter. The difference is that the outputs now
switch precisely at the same time. For this, all stages must work with
the same cycle. The cycle signal is now applied in parallel to all C-
inputs of the flipflops. A flipflop cannot wait for the result of the previous
stage but must know in advance whether it is to switch at the next
cycle. The Q output is connected to J and K of the following stage. If Q
= 1, the following cycle impulse switches both stages at once.