| 摘要 |
PURPOSE:To enable the accurate adjustment of a watch error by providing an oscillation circuit with a circuit generating a conditional control signal at the time of a watch error adjustment mode. CONSTITUTION:One end of a crystal resonator 41 is connected to the input of an inverter 42, and the other end thereof to the output of the inverter 42 through the intermediary of an output resistor 42. Moreover, both ends of the resonator 41 are earthed via capacitors 44 and 45 respectively, the input and output of the inverter 42 are connected to each other by a feedback resistor 46, and a clocked inverter 47 is connected in parallel to the inverter 42. A control signal of the inverter 47 is made to be a signal obtained by a method wherein a signal A generated at the time of a fall of a supply voltage and the operation of an alarm, etc. is multiplied logically in an AND circuit 48 by a signal obtained by passing through an inverter 49 a watch error adjustment mode signal generated at the time of a watch error adjustment mode. |
