| 摘要 |
An input side of each of JK flipflop units 11 to 14 has a connection selected from a twisted connection with an output side thereof, a straight connection with an output side of the JK flipflop unit provided before this flipflop unit, and twisted connections with output sides of two JK flipflop units provided at a lower stage and adjacent to this flipflop unit. An input side of each of JK flipflop units 21 to 25 has a connection selected from a twisted connection with an output side thereof, a straight connection with an output side of the JK flipflop unit provided before this flipflop unit and straight connections with output sides of two JK flipflop units provided at an upper stage and adjacent to this flipflop unit. Accordingly, a variable circuit capable of easily constructing a desired Johnson counter by changing a circuit configuration after being configured can be provided.
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