| 摘要 |
PURPOSE:To make a speed pulse counted value synchronize simply and precisely with a clock pulse counted value and to select speed detecting timing optionally by latching the clock pulse counted value corresponding to the time elapsed by a speed pulse. CONSTITUTION:A pulse from a pulse generator 5 corresponding to a speed counted by a counter 7 triggers a monostable multivibrator 8. A latch circuit 12 is controlled by the output of the multivibrator 8 and a latch pulse from a microcomputer 2 through an OR gate 9 and the counted value of a counter 11 which corresponds to the time elapsed required for counting pulses from a clock pulse generator 10 is latched by the circuit 12. Consequently, the speed pulse counted value is synchronized simply and precisely with the clock pulse counted value and the computer 2 detects speed of revolution or the like digitally at an optionally selected speed detecting timing by finding out the difference between said counted values and the preceeding latched values. |
