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A 4bit counter that goes and down

RoxasWally

New Member
Hello everyone,
I am kinda new to the website, I just came across it after looking for answers for such a long time.
I have an assignment that asks to add an input bit to your circuit from the circuit I created that goes up my sequence of 3 up to 15 called U (for up). If U is a 1, your circuit should count up through the sequence of multiples of 3 as normal. If U is a 0, your circuit should count down through the sequence of multiples of 3 (0, 15, 12, ..., 6, 3, 0, 15, 12...). I was able to draw the truth table and the K maps both for going up and down but I don't know how to implement the input circuit. For this assignment, we use a program called Logisim. Please redirect me if I am at the wrong subforum or if any extra information is needed.


This is for going UP

119125


This is for going down


119126
 

wkrug

Active Member
What should be Your input clock source?

A free running oszillator? Look for NE555 or C-Mos 4060.

Or an other Source with should be decoupled from this cicuit? Look for Optocouplers.

A simple switch - Then You need a debouncing cicuit.

Or a relay contact - That needs debouncing too?

Today I wanna Do Your Cicuit with a little Microcontroller.
But that has to be programmed.
 

Dr_Doggy

Well-Known Member
a quick trick would be to invert at the outputs of the filp flops ... or use the !Q pin if its there
 

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