Electronic control apparatus and method for writing backup data in electronic control apparatus
AssigneeHitachi, Ltd.
InventorsKazuya Hoshino, Masato Yuzawa
Life of this patent
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Abstract
When a power switch is turned OFF, the execution of steady process is stopped, and backup data is written into a flash memory. If the power switch is turned ON during the writing of the backup data, the backup data writing execution is allowed to last for a predetermined time T1 after an instant when the power switch is turned ON, and if the writing of the backup data is not terminated at the time when the predetermined time T1 has elapsed, the writing of the backup data is interrupted so that the steady process is started for being executed.
Claims25
An electronic control apparatus, comprising:
- a rewritable nonvolatile memory;
- a writing section that executes writing of backup data into the rewritable nonvolatile memory during self-shutoff process after a power switch is turned OFF;
- and
- a steady process resuming section that resumes steady process to be executed corresponding to an ON-state of the power switch, when the power switch is again turned ON during the writing of the backup data into the memory by the writing section.
An electronic control apparatus, comprising:
- a rewritable nonvolatile memory;
- writing means for executing writing of backup data in the rewritable nonvolatile memory during self-shutoff process after a power switch is turned OFF;
- and
- steady process resuming means for resuming steady process to be executed corresponding to an ON-state of the power switch, when the power switch is again turned ON during the writing of the backup data into the memory by the writing means.
A writing method of backup data in an electronic control apparatus having a rewritable nonvolatile memory, comprising the steps of:
- executing writing of backup data into the memory during self-shutoff process after a power switch is turned OFF;
- and
- resuming steady process corresponding to an ON-state of the power switch, when the power switch is again turned ON during the writing of the backup data into the memory.
Dependencies are inferred from the claim text.