H8SX1663 datasheet(412/1158 Pages) RENESAS

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Section 7 DMA Controller (DMAC)

Rev.1.00 Jun. 07, 2006 Page 360 of 1102

REJ09B0294-0100

The address is calculated by the offset set in DOFR and the contents of DSAR and DDAR.

Although the DMAC calculates only addition, an offset subtraction can be realized by setting the

negative value in DOFR. In this case, the negative value must be 2's complement.

(1) Basic Transfer Using Offset

Figure 7.18 shows a basic operation of a transfer using the offset addition.

Data 1

Offset

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

Transfer source:

Offset addition

Transfer destination: Increment by 4 (longword)

Data 1

Data 2

Data 3

Data 4

Data 5

Data 2

Data 3

Data 4

Data 5

Figure 7.18 Operation of Offset Addition

In figure 7.18, the offset addition is selected as the transfer source address update and increment or

decrement by 1, 2, or 4 is selected as the transfer destination address. The address update means

that data at the address which is away from the previous transfer source address by the offset is

read from. The data read from the address away from the previous address is written to the

consecutive area in the destination side.

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