H8SXSLASH1663M datasheet(512/1504 Pages) RENESAS

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Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 480 of 1468

REJ09B0412-0200

11.4

Transfer Modes

11.4.1

Ordinary Modes

The ordinary modes of EXDMAC are summarized in table 11.4. The transfer mode can be set

independently for each channel.

Table 11.4

Ordinary Modes

Address Register

Address

Mode

Transfer Mode

Activation Source

Common Function

Source

Destination

Dual

address

mode

•

Normal transfer

mode

•

Repeat transfer

mode

•

Block transfer

mode

(Repeat size/

block size

= 1 to 65,536 bytes/

word/longword)

•

Auto-request

(activated by the

CPU)

•

External request

•

Total transfer size:

1 to 4 Gbytes,

or no specification

•

Offset addition

•

Extended repeat

area function

EDSAR

EDDAR

Single

address

mode

•

Direct data transfer to/from external devices using

EDACK pin

instead of source or destination address register

•

Above transfer mode can be specified in addition to address

•

One transfer possible in one bus cycle

(Transfer mode variations are the same as in dual address mode.)

EDSAR/

EDACK

EDACK/

EDDAR

When the activation source is an auto-request, cycle steal mode or burst mode can be selected.

When the total transfer size is not specified (EDTCR = H'00000000), the transfer counter is halted

and the transfer count is not restricted, allowing continuous transfer.

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