| 摘要 |
PURPOSE:To make it possible to detect the rotary state of a rotary system in detail, by adding the signal from the rotary system to a bit ring counter while selecting one output of FF constituting said counter to perform counting by the other counter. CONSTITUTION:Flip-flop (FF) circuits 1-4 are connected in series and the output of the FF circuit 4 is connected to the input terminal of the FF circuit 1 to constitute a bit ring counter. A counter CNT 5 is provided so that either one of outputs from the FF circuit 1-4 is selected to be counted as a figure-up signal. A circuit 1-4 is selected to be counted as a figure-up signal. A rotary state is displayed while a figure, wherein a preset signal PS is imparted to a set terminal S by initialization, is shifted by a physical clock CK1 applied to the clock terminal C of FF. By counting the figure-up signal, the speed of a physical phenomenon, that is, for example, the rotation number within the unit time of a magnetic disc is counted. By selecting an angle showing a proper state as the figure-up signal, optimum control can be performed. |
