r4f2426 Renesas Electronics Corporation., r4f2426 Datasheet - Page 447

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

If the EDA bit in EDMDR is set to 1 during interrupt generation, transfer is resumed. Figure 8.9
illustrates the operation of the repeat area function.
Caution is required when the repeat area overflow interrupt function is used together with block
transfer mode. If transfer is always terminated when 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 repeat area range.
When lower 3 bits (8-byte area) of EDSAR are designated as repeat area
(SARA4 to SARA0 = 3)
Figure 8.9 Example of Repeat Area Function Operation
External memory
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
Rev. 1.00 Sep. 19, 2008 Page 419 of 1270
Repeated
Section 8 EXDMA Controller (EXDMAC)
Repeat area overflow
interrupt can be
requested
REJ09B0466-0100