Rev. 5.00, 09/03, page 352 of 760
11.3.4 DMA Transfer Types
The DMAC supports the transfers shown in table 11.5. Dual address mode has a direct address
mode and indirect address mode. In direct address mode, an output address value is the data
transfer target address; in indirect address mode, the value stored in the output address, not the
output address value itself, is the data transfer target address. Data transfer timing depends on the
bus mode, which may be cycle-steal mode or burst mode.
Table 11.5 Supported DMA Transfers
Destination
Source External Device
with DACK External
Memory
Memory-
Mapped External
Device
On-Chip
Peripheral
Module
External device with
DACK Not available Dual, single Dual, single Not available
External memory Dual, single Dual Dual Dual
Memory-mapped
external device Dual, single Dual Dual Dual
On-chip peri pheral
module Not available Dual Dual Dual
Notes: 1. Dual: Dual address mode
2. Single: Single address mode
3. Dual address mod e includes direct addres s mode and ind irect address mode .
4. 16-byte transfer is not available for on-chip peripheral modules.
Address Modes:
• Dual Address Mode
In dual address mode, both the transfer source and destination are accessed (selectable) by an
address. The source and destination can be located externally or internally. Dual address mode
has (1) a direct address transfer mode and (2) an indirect address transfer mode.