| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate the influence which a long access period of time has on coding of a microprogram because an external low-speed RAM connected externally to a DSP (digital signal processor) sometimes requires the long access period of time corresponding to a plurality of steps of the microprogram of the DSP. <P>SOLUTION: Data written in the external RAM (not shown) is supplied to an external memory control circuit 80 from an operation part 50 through one of write buffers 60 and 64. A changeover switch 52 alternately selects the write buffers 60 and 64 in each sampling period. Data read from the external RAM is similarly read by the operating part 50 through read buffers 62 and 66 switched by a changeover switch 54 in each sampling period. <P>COPYRIGHT: (C)2008,JPO&INPIT |
