Renesas SH7709S Manual De Usuario

Rev. 5.00, 09/03, page 352 of 760

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.

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 peripheral
module

Not available

Dual

Dual

Dual

Notes: 1. Dual: Dual address mode

2. Single: Single address mode

3. Dual address mode includes direct address mode and indirect address mode.

4. 16-byte transfer is not available for on-chip peripheral modules.

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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.