H8SXSLASH1663M datasheet(528/1504 Pages) RENESAS

528 / 1504 page

Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 496 of 1468

REJ09B0412-0200

For the offset addition method (c), address operation is not performed based on the data access

size. The EXDMAC adds the value set by EDOFR to the transfer destination or source address for

each time the data is transferred.

The EXDMAC sets the offset value in EDOFR and operates using EDSAR or EDDAR. The

EXDMAC can only add the offset value, but subtraction of the offset value is also possible by

setting a negative value in EDOFR. Specify a twos complement for a negative offset value.

(1)

Basic transfer using offset

Figure 11.18 shows the basic operation of transfer using an offset.

Data 1

Offset value

Address A1

Transfer

Address A2

= Address A1 + Offset

Address B1

Address B2 = Address B1 + 4

Address B3 = Address B2 + 4

Address B4 = Address B3 + 4

Address B5 = Address B4 + 4

Address A3

= Address A2 + Offset

Address A4

= Address A3 + Offset

Address A5

= Address A4 + Offset

Offset value

Transfer source:

Offset added

Transfer destination: Incremented by 4

(with a longword-size selected)

Data 1

Data 2

Data 3

Data 4

Data 5

Data 2

Data 3

Data 4

Data 5

Figure 11.18 Address Update Function Using Offset

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