I don't know what "recycling" is.Can be 0000 to o111 or 0001 to 1000, but no recycling.
What does "no recyling" mean?...
I need some help in getting my cd4029 counter to do what I want.
I'd like it to do a continuous count both forward and backward using ONLY 8 counts.
Can be 0000 to o111 or 0001 to 1000, but no recycling.
When counting up, it takes a three input AND or NAND to decode 0111 (to clear the counter on the next clock), but to detect 1000 doesn't need any logic. It is just as easy to preset the counter to 0001 as it is to clear it to 0000.Mike, counting 1 through 8 is just as good as 0 through 7. (from post #1)
The part counts 0 through 7 with out adding logic. Just, do not use the highest bit.
You will have to add an external flip-flop which is used to change the direction of counting. That flip-flop is set to count up and cleared to count down. You will need to detect the two "turn-around" states (0000 and 0111 or 0001 and 1000) to alternatively set and clear the "direction" flip flop.