193
Chapter 7
DMA Functions (DMA Controller)
Preliminary User’s Manual U15839EE1V0UM00
7.6 Transfer
Types
7.6.1 Two-cycle
transfer
In two-cycle transfer, data transfer is performed in two cycles, a read cycle (source to DMAC) and a
write cycle (DMAC to destination).
In the first cycle, the source address is output and reading is performed from the source to the DMAC.
In the second cycle, the transfer destination address is output and writing is performed from the DMAC
to the transfer destination.
Caution:
A one-clock idle period is always inserted between a read cycle and a write cycle.
7.7 Transfer
Object
7.7.1 Transfer type and transfer object
Table 7-1, “Relationship Between Transfer Type and Transfer Object,” on page 193 lists the relation-
ships between transfer type and transfer object.
Table 7-1:
Relationship Between Transfer Type and Transfer Object
Caution:
Addresses between 3FFF000H and 3FFFFFFH cannot be specified for the source and
destination address of DMA transfer. Be sure to specify an address between
FFFF000H and FFFFFFFH.
Destination
Two-Cycle Transfer
On-Chip
Peripheral I/O
External I/O
Internal RAM
External Memory
So
urc
e
On-chip peripheral I/O
√
√
√
√
External I/O
√
√
√
√
Internal RAM
√
√
√
√
External memory
√
√
√
√
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