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www.play-hookey.com | Thu, 03-04-2021 |
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Direct Current
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Alternating Current
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Semiconductors
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Digital
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Logic Families
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Digital Experiments
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Computers
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| Analog | Analog Experiments | Oscillators | Optics | HTML Test | |
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| Combinational Logic | Sequential Logic | Alternate Flip-Flop Circuits | Counters | Registers | The 555 Timer | | ||
| Basic 4-Bit Counter | Synchronous Binary Counter | Synchronous Decimal Counter | Frequency Dividers | Counting in Reverse | The Johnson Counter | |
Counters |
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Now that we've looked at a number different flip-flop circuits, what can we do with them by combining them in groups? One possibility is to remember and record a count of clock pulses rather than just a single past event. If we can count events and display the count, we can make use of that capability in many ways.
A very basic binary counter.
Making all flip-flops in the counter change state at the same time.
Shortening the count to represent a single decimal digit.
A counting twist: dividing the clock frequency by a fixed integer value.
Sometimes we want a countdown to a selected moment.
Here's a counting circuit with very simple output decoding.
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