| CPC G04F 5/04 (2013.01) [G04D 7/003 (2013.01); G04G 3/02 (2013.01)] | 15 Claims |
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1. A timepiece comprising:
a crystal oscillator;
an oscillator circuit that causes the crystal oscillator to oscillate;
a frequency divider that frequency divides the oscillation signal output from the oscillator circuit, and outputs a reference signal;
a nonvolatile memory that stores information related to a temperature characteristic of the oscillation frequency of the crystal oscillator;
multiple registers configured to the information;
a temperature measuring circuit that measures temperature and acquires temperature measurement information;
an evaluation circuit configured to determine whether or not the information stored in the multiple registers is the same; and
a temperature compensation circuit configured to read the information from one of the registers and correct the reference signal based on the read information and the temperature measurement information when the evaluation circuit determines the information stored in the multiple registers is the same, and
when the evaluation circuit determines the information stored in the multiple registers is different, read the information from the nonvolatile memory and store the read information in the multiple registers, and correct the reference signal based on the read information and the temperature measurement information.
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