H8SXSLASH1663R datasheet(529/1504 Pages) RENESAS

529 / 1504 page

Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 497 of 1468

REJ09B0412-0200

In figure 11.18, the offset addition method is set for updating the transfer source address, and the

method of increment/decrement 1, 2 or 4 is set for updating the transfer destination address. For

updating the second and subsequent transfer source addresses, the data of the address for which

the offset value is added to the previous transfer address is read. This data is written to the

successive area on the transfer destination.

(2)

Example of XY conversion using offset

Figure 11.19 shows the XY conversion by combining the repeat transfer mode and offset

addition.

Data 1

Data 2

Data 3

Data 4

Data 5

Data 11

Data 12

Data 16

Data 15

Data 14

Data 13

Data 10

Data 9

Data 8

Data 7

Data 6

Data 1

Data 5

Data 9

Data 13

Data 2

Data 11

Data 15

Data 12

Data 8

Data 4

Data 7

Data 3

Data 14

Data 10

Data 6

First cycle

1st transfer

Second cycle

2nd transfer

Third cycle

3rd transfer

First cycle

Second cycle

Third cycle

Fourth cycle

Data 1

Data 2

Data 3

Data 4

Data 15

Data 5

Data 11

Data 12

Data 16

Data 14

Data 13

Data 10

Data 9

Data 8

Data 7

Data 6

Data 1

Data 2

Data 3

Data 4

Data 15

Data 5

Data 11

Data 12

Data 16

Data 14

Data 13

Data 10

Data 9

Data 8

Data 7

Data 6

Data 1

Data 2

Data 3

Data 4

Data 15

Data 5

Data 11

Data 12

Data 16

Data 14

Data 13

Data 10

Data 9

Data 8

Data 7

Data 6

Data 1

Data 5

Data 9

Data 13

Data 12

Data 2

Data 11

Data 15

Data 16

Data 8

Data 4

Data 7

Data 3

Data 14

Data 10

Data 6

Transfer

Interrupt

requested

Interrupt

requested

Address

restored

Interrupt

requested

Address

restored

Transfer source

address

overwritten

by CPU

Transfer source

address

overwritten

by CPU

Offset value

Figure 11.19 XY Conversion by Combining Repeat Transfer Mode and Offset Addition

In figure 11.19, the source address side is set as a repeat area in EDACR and the offset addition is

set in EDACR. The offset value is the address that corresponds to 4

× data access size (example:

for a longword-size transfer, H'00000010 is specified in EDOFR). The repeat size is 4

× data

access size (example: for a longword-size transfer, 4

× 4 = 16 bytes are specified as a repeat size).

The increment by 1, 2 or 4 is set for the transfer destination. The RPTIE bit in EDACR is set to 1

to generate a repeat size end interrupt request at the end of a repeat-size transfer.

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