Mikroelektronika MIKROE-724 データシート

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mikoBasic PRO for dsPIC30/33 and PIC24

MikroElektronika

Every dsPIC33F device contains a portion of dual ported DMA RAM located at the end of Y data space. Direct Memory 

Access (DMA) is a very efficient mechanism of copying data between peripheral SFRs and buffers or variables stored 

in RAM, with minimal CPU intervention. 

The DMA controller can automatically copy entire blocks of data without requiring the user software to read or write the 

peripheral Special Function Registers (SFRs) every time a peripheral interrupt occurs. 

The DMA controller uses a dedicated bus for data transfers and therefore, does not steal cycles from the code execution 

flow of the CPU. To exploit the DMA capability, the corresponding user buffers or variables must be located in DMA 

RAM.

The last segment of data RAM space is not implemented, but can be mapped into program space for Program Space 

Visibility. This allows program memory to be read as though it were in data RAM.

 

- Boundaries between memory spaces are device specific. Please, refer to the appropriate datasheet for details. 

- Memory spaces are not shown to scale. Please, refer to the appropriate datasheet for details.

There are seven memory type specifiers that can be used to refer to the data memory: 

rx,  data,  code,  sfr, 

xdata, ydata, 

and

 dma

Related topics: Accessing individual bits, SFRs, Memory type specifiers, dsPIC Memory Type Qualifiers