How do you add two bit counters?

putting-together flip-flop counter-counter


Putting them together yields a two-bit counter: You can continue to add additional flip-flops, always inverting the output to its own input, and using the output from the previous flip-flop as the clock signal. The result is called a ripple counter, which can count to 2n - 1 where n is the number of bits (flip-flop stages) in the counter.
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