JK flip-flop, edge triggered

The edge-controlled JK flip-flop behaves exactly like an RS flip-flop with one exception. The inputs are labeled J and K to distinguish them from S and R. Just like with an RS flip-flop, a 1 at the input J means set, a 1 at the input K means reset and 0 for J and K means hold. If J and K are set to 1, however, an edge at C causes the flip-flop to toggle to the other state.