| 摘要 |
The present invention allows a save target stored in a volatile memory, to be reliably saved to a non-volatile memory and reduces the time required for the save processing as much as possible. The charging state of a battery is regularly of irregularly checked. It is determined, according to the checked charging state, which information element stored in the volatile memory should be made a save target at the time of the occurrence of a power interruption. Among a plurality of information elements stored in the volatile memory, a predetermined information element is made a non-save target of save processing, according to a state related to the predetermined information element.
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