H8SXSLASH1663M datasheet(451/1504 Pages) RENESAS

451 / 1504 page

Section 10 DMA Controller (DMAC)

Rev. 2.00 Sep. 24, 2008 Page 419 of 1468

REJ09B0412-0200

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 10.18 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 10.18 Operation of Offset Addition

In figure 10.18, 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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