Discussion in 'Homework Help' started by holybrings, Nov 14, 2007.

1. ### holybrings Thread Starter Active Member

Apr 4, 2007
64
0
How to reverse the binary counter of jk flip-flop by using switch?

from 1>3>5>7 to 7>5>3>1

May 16, 2005
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3. ### holybrings Thread Starter Active Member

Apr 4, 2007
64
0
can any1 help me?

4. ### beenthere Retired Moderator

Apr 20, 2004
15,815
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Try looking at the internal logic of an up/down counter. Why the requirement of the counter only outputting odd numbers?

5. ### holybrings Thread Starter Active Member

Apr 4, 2007
64
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just an example. thanks alot. i try to search for it

6. ### holybrings Thread Starter Active Member

Apr 4, 2007
64
0
looked through it but still cant think of it how to reverse it.

Aug 15, 2007
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8. ### holybrings Thread Starter Active Member

Apr 4, 2007
64
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but how to control it by using switch?

9. ### Papabravo Expert

Feb 24, 2006
10,179
1,800
The switch controls a multiplexer that selects either the true (Q) outputs, or the complement(Q-bar) outputs.

10. ### recca02 Senior Member

Apr 2, 2007
1,211
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i was thinking the same thing but.
for the sequence 1>3>5>7
wont the not o/p be 6>4>2>0 and not 7>5>3>1
m i missing something?

11. ### techroomt Senior Member

May 19, 2004
198
1
rich is right, the "Q not" outputs will count down. to get only odd outputs an lsb ff will not be used and the lsb output can just be tied high, and tied low for only even outputs.

12. ### recca02 Senior Member

Apr 2, 2007
1,211
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got it, thanks.
(i m learning too )