# Help: 4-Bit Counter Schematic

Discussion in 'OT Technology' started by JustJeff, Oct 21, 2007.

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Hey everyone. I usually don't need help with some of this Computer Engineering stuff, but I'm currently stumped and I have no idea what to do.

Here's the question:

Use the Counter-4 in LogicWorks to create a mod-11 counter, a counter that goes from 0-10, and then back to 0, using only the counter chip and any logic gates (and, or, nor, nand).

CLK = Clock Edge
CO = Carry Out
D0-3 = Inputs
Q0-3 = Outputs
EN = Enable
CLR = Clear
Up = ...?

So yeah, I don't know what to do with it.

2. ### etechNew Member

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I haven't used that counter but the premise is fairly simple.

I assume that it is a hex counter.( will count from 0 to F)

Set the inputs that you need set.
En=True
Up=True
D0-3 to False/0

You will need a clock pulse for the clock input, a debounced switch for example.

Now comes the logic, you will need to decode an hex 11 on the outputs( use and/nand gates and a clock pulse), when that is true, set the clear to true which will reset the counter to zero.

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Okay, i see what you mean. I wired everything up: I just need to figure out how to make the initial state values so that it can count on the clock edges...

Thanks for the help!

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