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Section 13 Direct Memory Access Controller (DMAC)
Rev. 4.00 Sep. 14, 2005 Page 432 of 982
REJ09B0023-0400
13.4.4
DMA Transfer Types
DMA transfer has two types; single address mode transfer and dual address mode transfer. They
depend on the number of bus cycles of access to source and destination. A data transfer timing
depends on the bus mode, which has cycle steal mode and burst mode. The DMAC supports the
transfers shown in table 13.8.
depend on the number of bus cycles of access to source and destination. A data transfer timing
depends on the bus mode, which has cycle steal mode and burst mode. The DMAC supports the
transfers shown in table 13.8.
Table 13.8 Supported DMA Transfers
Destination
Source
External Device
with
with
DACK
External
Memory
Memory
Memory-Mapped
External Device
External Device
On-Chip
Peripheral Module
Peripheral Module
X/Y Memory
U Memory
U Memory
External device
with
with
DACK
Not available
Dual, single Dual, single
Not available
Not available
External memory
Dual, single Dual Dual
Dual
Dual
Memory-mapped
external device
external device
Dual, single
Dual
Dual
Dual
Dual
On-chip
peripheral module
peripheral module
Not available
Dual
Dual
Dual
Dual
X/Y memory,
U memory
U memory
Not available
Dual
Dual
Dual
Dual
Notes: 1. Dual: Dual address mode
2. Single: Single address mode
3. 16-byte transfer is not available for on-chip peripheral modules.