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Preliminary User’s Manual U14913EE1V0UM00
Chapter 6
DMA Functions (DMA Controller)
The V850E/CA1 / ATOMIC 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).
6.1 Features
•
4 independent DMA channels
•
Transfer units: 8, 16 and 32 bits
•
Maximum transfer count: 65,536 (2
16
)
•
Two-cycle transfer
•
Three transfer modes
- Single transfer mode
- Single-step transfer mode
- Block transfer mode
•
Transfer requests
- Request by interrupts from on-chip peripheral I/O
- Requests by software trigger
•
Transfer objects
- Internal RAM
↔
I/O
- I/O
↔
Internal RAM
- I/O
↔
I/O
•
Next address setting function
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