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Ring counter
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<p> A ring counter is a type of counter composed of <a href="/facts/Flip-flop_(electronics)/vA99xjM7">flip-flops</a> connected into a <a href="/facts/Shift_register/foHzdJft">shift register</a>, with the output of the last flip-flop fed to the input of the first, making a "circular" or "ring" structure. </p><p>There are two types of ring counters: </p> <ul><li> A straight ring counter, also known as a <a href="/facts/One-hot/d6YJwj3d">one-hot</a> counter, connects the output of the last shift register to the first shift register input and circulates a single one (or zero) bit around the ring.</li> <li> A twisted ring counter, also called switch-tail ring counter, walking ring counter, Johnson counter, or <a href="/facts/M%25C3%25B6bius_band/35kzqqFL">Möbius</a> counter, connects the complement of the output of the last shift register to the input of the first register and circulates a stream of ones followed by zeros around the ring.</li></ul>