| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for realizing the startup of a system by using an old system parameter when system parameter update writing is not normally completed. SOLUTION: A non-voltage storage part 1 is provided with an A face and a B face side for storing a system parameter, check sum, and old and new information (the sequence counter of a modulo 4), and an MPU 2 operates the writing and reading of the system parameter for the A side and B side of the non-volatile storage part 1 by using writing signals 3 and 6 and writing signals 4 and 5 and error check. At the time of writing, the side whose sequence counter value is larger is used as the latest face, and the face whose sequence counter value is smaller is used as an update face, and the writing processing is alternately operated in the two faces. |
