Flip-Flop Circuits

In either case, you cause the flip-flop to go into these three modes by doing the following:

Set by activating J, deactivating K, and clocking C.

Reset by activating K, deactivating J, and clocking C.

Toggle by activating J and K simultaneously, and clocking C.

Specifically, though, here is what you would need to do to each flip-flop, stated in terms of “high” and “low” logic states:

For the J-K flip-flop with active-high inputs:

Set by making J high, K low, and C transition from low to high.

Reset by making K high, J low, and C transition from low to high.

Toggle by making J high, K high, and C transition from low to high.

For the J-K flip-flop with active-low inputs:

Set by making K high, J low, and C transition from high to low.

Reset by making J high, K low, and C transition from high to low.

Toggle by making J low, K low, and C transition from high to low.