| 摘要 |
To make it possible to rewrite a control program and decrease man-hours for change of the control program without removing a microcomputer or ROM when an automobile controller must change the control program due to any reason.The following are used: a microcomputer 3 for accessing an electrically erasable nonvolatile memory 3-1 storing a control program, an external unit 2 storing a rewriting program 2-1 and a rewriting voltage source 2-2 for generating a rewriting voltage in accordance with the rewriting program 2-1, and a logic circuit 7A for generating a signal for setting the mode-setting related terminal of the microcomputer 3 to the rewriting mode in accordance with a writing voltage 1b generated by the external unit 2.
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