To make a synchronous "down" counter, we need to build the circuit to recognize the appropriate bit patterns predicting each toggle state while counting down. Not surprisingly, when we examine the four-bit binary count sequence, we see that all preceding bits are "low" prior to a toggle (following the sequence from bottom to top):
Since each J-K flip-flop comes equipped with a Q' output as well as a Q output, we can use the Q' outputs to enable the toggle mode on each succeeding flip-flop, being that each Q' will be "high" every time that the respective Q is "low:"
Links :
- Synchronous counters
- Different type of synchronous counters
- Synchronous “up” counter
- Synchronous “up/down”counter
- Application of “up/down” counter
| Get free daily email updates! | Follow us!     |
No comments:
Post a Comment
Please provide valuable comments and suggestions for our motivation. Feel free to write down any query if you have regarding this post.