| 摘要 |
PURPOSE:To keep the output period of a clocking electronic circuit approximately at a fixed level even if battery voltage is changed and stabilize its accuracy by carrying out the logical changing processing in accordance with the value of power voltage. CONSTITUTION:The voltage of a power source 6 is detected by a voltage detecting circuit 5 in accordance with a sampling pulse outputted from a smapling pulse generating circuit 4 controlled at a prescribed step of divided outputs through a crystal oscillator 1, an oscillating circuit 2 and a frequency dividing circuit 3. In accordance with the detected voltage, a logical changing pulse is outputted from a logical changing pulse generating circuit 7 and inputted to a FF having a setting terminal in the circuit 3 to execute logical changing processing. Even if the voltage of the power source 6 is changed, the output period of the clocking electronic circuit controlling a clock driving circuit 8 etc., is kept approximately at a fixed level by the output of the circuit 3 and stable accuracy is kept. Consequently a lithium battery, a silver peroxide battery having a high potential division and a solar battery can be combined as a power battery, making it possible to form a long-life and small-sized electronic clock. |
