
It is a simple Johnson counter, which need only clock to count. A Johnson counter is defined as a digital sequential logic circuit where the complement output of the last flip-flop is fed back to the input of the first flip-flop. (https://www.electrical4u.com/johnson-counter/)
Just Turn the circuit on
Nothing
| # | Input | Output | Bidirectional |
|---|---|---|---|
| 0 | OUT0 | ||
| 1 | OUT1 | ||
| 2 | OUT2 | ||
| 3 | OUT3 | ||
| 4 | OUT4 | ||
| 5 | OUT5 | ||
| 6 | OUT6 | ||
| 7 | OUT7 |