Patent ID: 8824244
Filing Date: 2014-09-02
Classification: G04C,G04R

Abstract:
1. A radio-controlled wristwatch, comprising: reception means for receiving a radio wave from a satellite and extracting day-related information therefrom; timekeeping-circuit halting means for halting an operation of a timekeeping circuit based on a power supply voltage; timekeeping-circuit halt detection means for detecting that the operation of the timekeeping circuit has been halted by the timekeeping-circuit halting means; a nonvolatile memory for storing the day-related information and a cycle number of the day-related information; and cycle-number updating means for comparing, when the timekeeping-circuit halt detection means detects that the operation of the timekeeping circuit has been halted, the day-related information extracted by the reception means and the day-related information stored in the nonvolatile memory to each other, and updating the cycle number of the day-related information when the day-related information stored in the nonvolatile memory is larger than the day-related information extracted by the reception means.