| 摘要 |
<p>A data processor in which a CPU performs predetermined processings while accessing an external memory such as an SDRAM. The processing capacity of a system constructed by the data processor is maintained, or improved while considerably reducing the power consumption of the system. The data processor comprises CPU (21) for performing a predetermined processing while accessing an external SDRAM (31) and an SDRAM controller (24) for control the access to the SDRAM (31) in response to a request of the CPU (21). The operating clock (Φ1) of the CPU (21) is set to a relatively low speed, and the operating clock (Φ2) of the SDRAM controller (24) is set to a relatively high speed.</p> |
