H8SXSLASH1663R datasheet(526/1504 Pages) RENESAS

526 / 1504 page

Section 11 EXDMA Controller (EXDMAC)

Rev. 2.00 Sep. 24, 2008 Page 494 of 1468

REJ09B0412-0200

Caution is required when the extended repeat area overflow interrupt is used together with block

transfer mode. If transfer is always terminated when extended repeat area overflow occurs in block

transfer mode, the block size must be a power of two, or alternatively, the address register value

must be set so that the end of a block coincides with the end of the extended repeat area range. If

extended repeat area overflow occurs during a block-size transfer in block transfer mode, the

extended repeat area overflow interrupt request is held pending until the end of the block, and

transfer overrun will occur.

The same caution is required when the extended repeat area overflow interrupt is used together

with cluster transfer mode.

Figure 11.16 shows an example in which block transfer mode is used together with the extended

repeat area function.

External memory

Range of

EDSAR values

First block

transfer

Second block

transfer

H'23FFFE

H'23FFFF

H'240000

H'240001

H'240002

H'240003

H'240004

H'240005

H'240006

H'240007

H'240008

H'240009

H'240000

H'240001

H'240002

H'240003

H'240004

H'240005

H'240006

H'240007

H'240000

H'240001

H'240002

H'240003

H'240004

H'240000

H'240001

H'240005

H'240006

H'240007

Interrupt

requested

Block transfer in progress

When lower 3 bits (8-byte area) of EDSAR are designated as extended repeat area (SARA4 to

SARA0 = 3), and block size of 5 (bits 23 to 16 in EDTCR = 5) is set in block transfer mode.

Figure 11.16 Example of Extended Repeat Area Function Operation in Block Transfer

Mode

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