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● DSP data access

In order to access DSP data, there is a way to use DSP DMA instructions, but there is also a way to access the DSP data RAM area from the main CPU. Data can be accessed by controlling from the main CPU in the following order. 
 (1) Set bit16 and bit17 of the program control port to 0.
(2) Write the access start address to the data RAM address port.
∙ It cannot be set unless the DSP is stopped.
(3) Data is sequentially accessed in longword units via the data RAM data port.
Access.

Fig. 2.18 to Fig. 2.20 show the control method from the CPU step by step.

Figure 2.18 DSP data access step1

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