| 摘要 |
PURPOSE:To perform stable operation by generating continuous variable frequency with the use of crystal oscillator to control frequency fluctuation. CONSTITUTION:Frequency of highly accurate oscillation from a crystal oscillator 6 is devided at a frequency devider 7, and plural kinds of devided frequency are input into a multiplexer 8. A flip-flop 12 performs the input of slow-up-start signal into the set input and of slow-down-stop signal into the reset input respectively; its output goes into an up-down counter 14 through an AND gate 13. The up-down counter 14 switches and selects the adress of the multiplexer 8 by its up or down performed by the AND of the output of a time setting counter 11 and of the output of the flip-flop 12, thereby changing over the frequency that is output into a pulse motor. |
