| 摘要 |
PURPOSE:To shorten the time required for adjustment and test of a light receiving sensor controller by providing a means which switches the oscillated frequency of a clock signal generating circuit and shorten the delay time at a test time. CONSTITUTION:When a binary signal P2 of a photosensor output is changed, a counter 9 starts counting clock pulses P8 outputted from an oscillator 10. When the counted value exceeds a prescribed value, that is, when a prescribed time elapses after said change, a new signal corresponding to the binary signal after change is outputted from a delayed flip-flop 11. An oscillator 10 is provided with a switch 16 for switching the oscillated frequency, and this switch 16 is switched to raise the oscillated frequency when the photosensor controller is tested. Then, the frequency of clock pulses P8 is raised, and the time when the counter 9 reaches the same counted value is shortened, and the delay time is shortened. |
