| 摘要 |
An access destination determining section determines whether an access is directed to region 1 or region 2. A region 1 drive capability register and a region 2 drive capability register set drive capabilities of output buffers when accesses to region 1 and region 2 generate, respectively. For example, if "1" is set to region 1 drive capability register, when an access to region 1 generates, a Buf2 output enable signal is output at high level to enable outputs of Buf2s. Therefore, a drive capability of a bus can be altered according to a region to which an access is made by a CPU or the like, thereby enabling prevention of unnecessary power consumption and generation of noise.
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