Johnson Counter

The Johnson counter, also called the twisted ring counter, is a variation of the ring counter, with the inverse output of the most significant flip-flop passed to the input of the least significant flip-flop. The sequence followed begins with all 0's in the register. The final 0 will cause 1's to be shifted into the register from the left-hand side when clock pulses are applied. When the first 1 reaches the most significant flip-flop, 0's will be inserted into the first flip-flop because of the cross-coupling between the output and the input of the counter.




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