| 摘要 |
An internal voltage boosting circuit has an oscillator circuit that generates a signal of a prescribed frequency under the control of an oscillator control signal and a stepped-up voltage generating circuit that inputs the signal output by the oscillator circuit and outputs a prescribed stepped-up voltage. In the stepped-up voltage generating circuit, in order to prepare for a next voltage boosting operation, one end of a voltage boosting capacitance is connected to one end of a voltage boosting capacitance of another voltage boosting circuit that operates with a phase difference of 180 degrees, the accumulated charge therein being re-used, after which return is made to the ground potential so as to achieve a voltage boosting to a prescribed stepped-up voltage.
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