| 摘要 |
PURPOSE:To prevent the erroneous operation and display due to the instantaneous change in the battery voltage by sampling the battery voltage detecting signal from a voltage comparing circuit by a specified clock pulses, and obtaining the battery detecting signal for the system control. CONSTITUTION:The output of the voltage comparing circuit 1 is applied to reset terminals R of T type FF circuits F3-F5 via an inverter circuit IN. The clock pulses phi' are applied to an input terminal T of the first stage FF circuit F3 via a gate circuit G5. An output Q from F3 is applied to an input terminal T of the next stage FF circuit F4. Its output Q is applied to an input terminal T of the final stage circuit F5. By the inverted output of the final stage FF circuit F5, the battery voltage detecting signal BC is obtained and fed back to the gate circuit G5. In this constitution, the erroneous operation and the erroneous display can be prevented due to the instantaneous change in the battery voltage. |
