| 摘要 |
The present invention provides a data processing apparatus (10) capable of maintaining consistency of specific data without switching between a write-back method and a write-through method. A first microcomputer of an engine ECU performs data updating in the write-back method. In the case of performing data writing process on specific data, the data writing process is performed on dummy data having the same index and a different tag (forced write-back). Consequently, the specific data written in a cache memory (23, 33) is evicted from the cache memory (23, 33) immediately by writing of the dummy data and is written in a main-storage RAM (21, 31). Therefore, without switching the write-back method to the write-through method, the same specific data can be stored in both of the cache memory (23, 33) and the main-storage RAM (21, 31).
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