| 摘要 |
PROBLEM TO BE SOLVED: To provide an automobile control unit that enables shorter rewriting of control software loaded on a nonvolatile memory. SOLUTION: In an ECU 1, a flash ROM 5 forms a main storage area 20 for storing a current version program and a sub storage area 21 for storing an update version program. A program rewriting tool 5a executes program rewriting processing including the program storage processing of storing an externally acquired update version program in the sub storage area 21 and the memory switching processing of, if the writing of the update version program to the sub storage area 21 is successful, replacing the memory space currently used as the main storage area 20 with the sub storage area 21 storing the update version program as a new main storage area, or if the writing to the sub storage area 21 is unsuccessful, skipping the switching. COPYRIGHT: (C)2007,JPO&INPIT
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