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This enables the counter to begin from any value. Download the Datasheet for Take care with the priority of controls. If your circuit fails to work, chances are that you have one of the control inputs incorrectly set. A basic single digit counter from 0 to 9 then resets. This will convert the BCD code to the drive the correct 7-segment output. The preset inputs L will now be present on the outputs.
This means joining them together to make larger counters. This happens at the same time the counter is disabled but it seems to work.
Note how similar controls on each IC are linked together - in parallel. Connected sequentially so that each counters outputs change slightly later than the previous counters. This is the cheapest and easiest method - in particular when 3 or more counters are cascaded.
NOTE: It is important that the direction input only changes when the clock input is high. Try changing the direction in the simulation and note how sometimes it jumps a digit. This is because the direction was changed when the clock was low. Cascading 3 or more is the same as for 2. In the simulation, you will notice how the digits change one after the other when rolling over from to This is because the simulated displays take a bit longer to react, but it emphasises the difference betweeen Ripple counters and Synchronous counters.
It is important that if you change direction of the counter that you do it while the clock is high - recommended by datashee t. Presettable : - when a counter can be set to start at any value.
Trapping - To use logic gates to detect when a certain binary value is present. Modified: , 22 October Download Livewire simulation of counter Remember to save to file, then open Livewire and navigate to the file using Open Return to top of page.
BCD means it can count between 0 and 9. Download Livewire simulation of functions Remember to save to file, then open Livewire and navigate to the file using Open Download Livewire simulation of single digit counter Remember to save to file, then open Livewire and navigate to the file using Open Download Livewire simulation of digital dice Remember to save to file, then open Livewire and navigate to the file using Open Use this method if you are "trapping" and binary values or comparing bits with another output.
Download Livewire simulation of counters Remember to save to file, then open Livewire and navigate to the file using Open
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