| 摘要 |
An oscillation stoppage detecting circuit has a boost circuit to which is inputted an output of an oscillation circuit and a level detection circuit to which is inputted an output of the boost circuit. The boost circuit used here is, for example, a voltage doubler circuit which utilizes two diodes, a capacitor and an inverter, which is so-called a charge pump circuit. The boost circuit is operated by the oscillation output of the oscillation circuit and the oscillation stoppage is detected as a result of the comparison between the output voltage of the boost circuit and a threshold voltage of the level detection circuit. The arrangement enables to realize a circuit of low power consumption.
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