| 摘要 |
A controller includes a first judging part that judges abnormality of a first memory part, and a second judging part that judges abnormality of a second memory part based on (1) results of comparing with each other data having a same content written in the second memory part multiple times, and (2) a total amount of the data read out from the second memory part, when the first memory part is judged to be abnormal. In addition, a third judging part judges abnormality of the second memory part, based on results of comparing the data written in the second memory part with the data read out from the second memory part.
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