| 摘要 |
<p>A microcomputer, in which the memory and cache memory are optimally controlled to improve computer processing performance. A microcomputer (MPU) includes built-in memories (9, 10) mounted to the same semiconductor substrate with a cache memory (CACHE). The built-in memories are those which allow high speed access in the same way as a cache hit in the cache memory. High speed access can be made to the built-in memories (9, 10) in all cases in the same way as the cache hit by making them noncacheable, that is, by mapping the built-in memories (9, 10) to a noncacheable area. If they are cacheable, on the other hand, the data relating to a cache miss must be placed in the cache memory in the event of a cache miss during access to the built-in memories.</p> |
