| 摘要 |
Flash ROMs (13, 113) store a control program for controlling an internal combustion engine and a boot program for rewriting the flash ROMs (13, 113) in respective storage areas. A user breakable object area is set appropriately to the flash ROMs (13, 113) by a user breakable function of a UBC (112) which a microcomputer (11) has in an ECU (10). Thus, even when a reading command or a writing command is issued to predetermined addresses in the user breakable object area of the flash ROMs (13, 113), the processing jumps to a predetermined other address without changing the stored therein. Therefore, a request of writing to the boot program storage area of the flash ROMs (13, 113), which arises from some abnormality, can be eliminated.
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