| 摘要 |
PROBLEM TO BE SOLVED: To provide a power supply for an arithmetic section having a low-voltage operation mode by which the supply power of a battery power supply is increased or decreased without evolving malfunction in a voltage detection section outputting a reset signal to the arithmetic section when power feeding to the arithmetic section has a voltage detection value or less accompanying with setting the low-voltage operation mode. SOLUTION: The power supply for the arithmetic section having the low-voltage operation mode comprises: a power feeding section feeding power to the arithmetic section; the voltage detection section outputting the reset signal to the arithmetic section when voltage supplied to the arithmetic section by the power feeding section has the voltage detection value or less; and a control section reducing the output voltage of the power feeding section accompanying with the setting of the low-voltage operation mode of the arithmetic section. Where, the control section recovers the voltage detection value of the voltage detection section through: reducing the voltage detection value of the voltage detection section to a value lower than the reduced voltage mentioned above; reducing the output voltage of the power feeding section; recovering the output voltage of the power feeding section accompanying with the release of the low-voltage operation mode; and recovering the voltage detection value of the voltage detection section. COPYRIGHT: (C)2004,JPO
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