| 摘要 |
PURPOSE:To ensure precise time control with no error, by initially setting a dividing circuit in response to the data writing signal of a counting circuit of a microprocessor. CONSTITUTION:A lead 20 is connected to a clear terminal 22 of a prescaler 14. The digital value is written into a counter 16 through a data bus 18 and stored there. Then the prescaler 14 is initially set at a prescribed value as soon as a writing signal emerges at the lead 20. As a result, an acurate correspondence is always obtained between the time during which the counter 16 receives the wriring signal at the lead 20 from a control circuit and then produces an output signal to a lead 24 and the value which is written into the bus 18 from the counter 16. In such a way, no variance is caused in time control. |
