r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 448

• Manufacturer Part Number: r4f2426
• Description: 16-bit Single-chip Microcomputer H8s Family / H8s/2400 Series
• Manufacturer: Renesas Electronics Corporation.

Section 8 EXDMA Controller (EXDMAC)
If repeat area overflow occurs while a block is being transferred in block transfer mode, the repeat
interrupt request is held pending until the end of the block, and transfer overrun will occur. Figure
8.10 shows an example in which block transfer mode is used together with the repeat area
function.
Rev. 1.00 Sep. 19, 2008 Page 420 of 1270
REJ09B0466-0100
When lower 3 bits (8-byte area) of EDSAR are designated as repeat area (SARA4 to SARA0 = 3),
and block size of 5 (EDTCR[23–16] = 5) is set in block transfer mode
External memory
Figure 8.10 Example of Repeat Area Function Operation in Block Transfer Mode
H'23FFFE
H'23FFFF
H'240000
H'240001
H'240002
H'240003
H'240004
H'240005
H'240006
H'240007
H'240008
H'240009
:
:
EDSAR values
H'240000
H'240001
H'240002
H'240003
H'240004
H'240005
H'240006
H'240007
Range of
First block
H'240000
H'240001
H'240002
H'240003
H'240004
transfer
Second block
H'240000
H'240001
H'240005
H'240006
H'240007
transfer
Block transfer
in progress
Interrupt
requested