| 摘要 |
PURPOSE: A method for downloading new software and a boot version to the memory of an embedded system is provided by using a fail-safe procedure by discriminatingly using a write-protected area and an unprotected area. CONSTITUTION: A controller (11) performs system operation by operating software stored on a flash memory (12). A RAM (13) is a volatile memory for temporarily storing an initializing and a downloading program and in download mode, a controller (11) is made to operate the system (10). At this time, the software of the latest version copied from the flash memory (12) to the RAM (13) is used each time the system is initialized. To allow complete operation in downloading operation, all operating programs can be copied to the RAM 13.
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