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Up-down-counter

2017-08-18 14:36  
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The discrete-gate up/down-counter desigo has the unusual property of freezing, or saturating, when it reaches its lowest count in the down-count mode or its highest count in the count-up mode instead of rolling over and resetting as do most counters. This property proves especial!y useful in position-control systems. For example, you wouldn`t want a robot`s arm to slowly move to full extension as the counter counts up and then have it suddenly slam back to its rest position when the counter resets to zero.
Up-down-counter

You can cascade as many of the A cells as you need because the counter`s outputs are synchronous. The B cell accepts the carry bit from the most sigoificant bit. s A cell and provides the clock control that stops the counter. Make sure that the freeze input to the B cell doesn`t get asserted when the clock input is low; otherwise, the counter might make an extra count.



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