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Preliminary User’s Manual U15839EE1V0UM00
Chapter 7
DMA Functions (DMA Controller)
The V850E/CA2 includes a direct memory access (DMA) controller (DMAC) that executes and controls
DMA transfer.
The DMAC controls data transfer between memory and I/O or among I/Os, based on DMA requests
issued by the on-chip peripheral I/O, or software triggers (memory refers to internal RAM).
7.1 Features
•
Four independent DMA channels
•
Transfer units: 8, 16 and 32 bits
•
Maximum transfer count: 65,536 (2
16
)
•
Two types of transfer
- two cycle transfer
•
Four transfer modes
- Single transfer mode
- Single-step transfer mode
- Line transfer mode (Four bus cycle transfer mode)
- Block transfer mode
•
Transfer requests
- Request by interrupts from on-chip peripheral I/O
- Requests by software trigger
•
Transfer objects
- Between internal RAM and I/O
- Between internal RAM and external I/O
- Between internal RAM and internal RAM
- Between external memory and I/O
- Between external memory and external memory
- Between I/O and I/O
•
DMA transfer completion flag
•
Next address setting function
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