![]() The register changes states when the Data does, it doesn't latch like we want it to. How do we fix this? By adding a Write Enable. If Data goes low, then Set goes low and Reset goes high making Q go low and ~Q go high. So far, when Data is high, Set is high and Reset is low so Q is high. Now the question becomes how do we make all of this happen with only one input? We do this by connecting the data line to the Set input and connecting it to the Reset line through an inverter. If, however, Reset goes high, then Q will go low and ~Q will go high. ![]() When the Set line goes high, Q will go high and stay high even after Set goes low. ![]() This flip flop circuit uses 2 inputs, Set and Reset, to control 2 outputs, Q and ~Q (not Q). The basis of the circuit is the SR Flip Flop.
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