| 摘要 |
An external device for sending data can execute write access by the control of a buffer memory management unit and an access control unit only when an empty area is present in a buffer memory area of a memory designated by an area designating unit of the buffer memory management unit. Another external device for receiving data can execute read access by the control of the buffer memory management unit and an access control unit only when data is stored in the buffer memory area. The external devices with different processing speeds can transfer data asynchronously.
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