User manual

35
Fig. 26: Testing the NOR circuit
8 RS-Flipflop
A flipflop is a circuit that independently maintains one of two conditions.
A digital condition can be saved. Certain input conditions switch the
output. The RS flipflop has two inputs, reset (R) and set (S). In the
quiescent state, both inputs are set high (R = 1, S = 1). The output is
then not determined (X) and depends on the previous history.
Switching R to 0 switches the output off. Switching S to zero switches it
on.