| 摘要 |
Using an oscillating unit ( 601 ) that can start oscillation with a low voltage, an oscillation signal (S 1 ) of the oscillating unit ( 601 ) is amplified via a waveform shaping unit ( 603 ), and is fed to a boosting control unit ( 105 ). A boosting unit ( 103 ) is caused to perform a boosting behavior by a boosting clock (Sa) with the same frequency as an oscillation frequency of the oscillation signal (S 1 ) just after the oscillating unit ( 601 ) starts. Thereby, a whole electronic timepiece ( 100 ) can be self-actuated, even if a generation voltage is low. Further, the oscillating unit ( 601 ) is constituted such that a operating current always becomes constant. Thereby, the electronic timepiece can be provided with an electricity-generating unit ( 101 ) such as a solar cell with a one-stage constitution having a low open voltage.
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