| 摘要 |
PROBLEM TO BE SOLVED: To provide a method in which a plurality of nonvolatile memories are easily updated and the read check of the memories is easily performed when the plurality of the nonvolatile memories are multiplexed. SOLUTION: An area which is continuous to the first nonvolatile memory 2a and the second nonvolatile memory 2b is divided on a single memory map, and the second nonvolatile memory 2b allocated on a backup area is updated. A system is started using a program updated on the second nonvolatile memory 2b which becomes a main area by replacing memory areas by selectors 6a and 6b, and then the first nonvolatile memory 2a newly allocated on the backup area is updated. Therefore, the first and second nonvolatile memories can be updated using a single CPU. COPYRIGHT: (C)2004,JPO
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