Patent Number: 6,168,321

Title: Electronic control unit having user breakable function

Abstract: Flash ROMs store a control program for controlling an internal combustion engine and a boot program for rewriting the flash ROMs in respective storage areas. A user breakable object area is set appropriately to the flash ROMs by a user breakable function of a UBC which a microcomputer has in an ECU. 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, 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, which arises from some abnormality, can be eliminated.

Inventors: Tanaka; Ryoji (Kariya, JP), Komori; Hirokazu (Okazaki, JP)

Assignee: Denso Corporation

International Classification: G06F 11/14 (20060101); G06F 009/44 ()

Expiration Date: 01/02/2018