| 摘要 |
<p>A backwards and forwards counter has gates which control the counting direction. Each counting stage is a clock controlled king-master-slave flip-flop. Each corresponding master stage is doubled, with the inputs connected in parallel. The additional master stages form the presetting register, and outputs of master stages are connected to a comparator which responds when two master stages belonging to the same counting stage have the same operational position in all counting stages.</p> |
