| 摘要 |
An electronic timepiece has a solar cell; a detection circuit configured to detect an output value of the solar cell; a storage battery; a charging control circuit that connects and disconnects the solar cell and the storage battery; and a control unit that controls the charging control circuit. The control unit sets a detection period D1 in which the control unit detects the output value of the solar cell and receives an optical signal, and charging periods C1, C2 in which the storage battery can be charged, during a reception period for receiving a data signal of transmission data transmitted from a communication target; controls the charging control circuit to disconnect the solar cell and the storage battery, and causes the detection circuit to detect the output value of the solar cell, during the detection period D1; and controls the charging control circuit to connect the solar cell and the storage battery during the charging periods C1, C2. |
