| 摘要 |
<p>Data stored in each sector of a flash memory, including the boot sectors, can be rewritten with a single download operation. The flash memory (101) has a cold boot sector (201) for storing cold boot data, at least two other boot sectors (202, 203) for storing additional boot data, and a main memory portion for storing main data. A boot data evaluation unit (301) selects the boot code stored in boot sectors that is to be activated by the cold boot data based on boot data update evaluation data. Using a function of the boot data selected by the boot data evaluation unit (301), a rewrite unit (302, 303) rewrites data stored in the main memory portion, cold boot sector, and boot memory portion other than the boot memory portion storing the selected boot data based on received update data. Rewriting data stored in the cold boot memory portion is enabled when update data for writing specific data to a specific address is received.
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