Provided is a timepiece including a solar cell that has a solar panel, a secondary battery that is charged from the solar cell, an overcharge prevention circuit that detects a charged state of the secondary battery, and a control unit that short-circuits the solar cell and determines that illuminance of light illuminating the solar panel is equal to or higher than predetermined illuminance in a case where the overcharge prevention circuit is detected to be in an overcharge state.

Provided is a timepiece including a solar cell that has a solar panel, a secondary battery that is charged from the solar cell, an overcharge prevention circuit that detects a charged state of the secondary battery, and a control unit that short-circuits the solar cell and determines that illuminance of light illuminating the solar panel is equal to or higher than predetermined illuminance in a case where the overcharge prevention circuit is detected to be in an overcharge state.

Provided is a timepiece including a solar cell that has a solar panel, a secondary battery that is charged from the solar cell, an overcharge prevention circuit that detects a charged state of the secondary battery, and a control unit that short-circuits the solar cell and determines that illuminance of light illuminating the solar panel is equal to or higher than predetermined illuminance in a case where the overcharge prevention circuit is detected to be in an overcharge state.

An electronic timepiece and control method of an electronic timepiece prevent system shutdowns due to a voltage drop, and increase opportunities to acquire time information. An electronic timepiece 1 has a reception module 50 that receives satellite signals; a storage battery 24 that supplies drive power; a voltage detection circuit 74 that detects the voltage of the storage battery 24; a temperature detector 67 that detects temperature; a reception command unit that instructs receiving satellite signals; and a reception controller that executes a reception process to receive satellite signals in response to a command from the reception command unit. The reception controller executes the reception process when the detected battery voltage is greater than or equal to a threshold set for the detected temperature, and does not execute the reception process when the reserve power is less than the threshold.

An electronic timepiece and control method of an electronic timepiece prevent system shutdowns due to a voltage drop, and increase opportunities to acquire time information. An electronic timepiece 1 has a reception module 50 that receives satellite signals; a storage battery 24 that supplies drive power; a voltage detection circuit 74 that detects the voltage of the storage battery 24; a temperature detector 67 that detects temperature; a reception command unit that instructs receiving satellite signals; and a reception controller that executes a reception process to receive satellite signals in response to a command from the reception command unit. The reception controller executes the reception process when the detected battery voltage is greater than or equal to a threshold set for the detected temperature, and does not execute the reception process when the reserve power is less than the threshold.

A detecting circuit and a configuration status detecting method of a Real-Time Clock (RTC) battery and an electronic apparatus using the same are provided. The detecting circuit includes a power capturing unit, a voltage dividing unit and an output unit. The power capturing unit couples to a power supply output terminal of the RTC battery and captures a power supply signal from the power supply output terminal in response to a detecting-controlled signal. The voltage dividing unit couples to the power capturing unit and is configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal. The output unit couples to the voltage dividing unit to receive the dividing signal, where the output unit generates a detecting result signal related to a configuration status of the RTC battery according to the dividing signal.

A detecting circuit and a configuration status detecting method of a Real-Time Clock (RTC) battery and an electronic apparatus using the same are provided. The detecting circuit includes a power capturing unit, a voltage dividing unit and an output unit. The power capturing unit couples to a power supply output terminal of the RTC battery and captures a power supply signal from the power supply output terminal in response to a detecting-controlled signal. The voltage dividing unit couples to the power capturing unit and is configured to divide the power supply signal captured by the power capturing unit to generate a dividing signal. The output unit couples to the voltage dividing unit to receive the dividing signal, where the output unit generates a detecting result signal related to a configuration status of the RTC battery according to the dividing signal.