| 摘要 |
<p>[PROBLEMS] To provide a data processing device comprising a data-length-variable DSP which can access data while a CPU accesses an external memory thereof. [MEANS FOR SOLVING PROBLEMS] In the case of 24-bit mode, if the judgment unit (11) judges that an access from the DSP (2) to the external memory (102) is present, a control unit (12) instructs wait of an access from the CPU (111) to the external memory (102). Moreover, in the case of 16-bit mode, by using an empty third bus-cycle, the control unit (12) outputs an instruction to an address data switching unit (13), so that the CPU (111) can access the external memory (102).</p> |
