Rev. 1.0, 09/01, page 342 of 904
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 repeat area (SARA4 to SARA0 = 3),
and block size of 5 (EDTCR[23–16] = 5) is set in block transfer mode
Figure 8.10 Example of Repeat Area Function Operation in Block Transfer Mode
8.4.7
Registers during DMA Transfer Operation
EXDMAC register values are updated as DMA transfer processing is performed. The updated
values depend on various settings and the transfer status. The following registers and bits are
updated: EDSAR, EDDAR, EDTCR, and bits EDA, BEF, and IRF in EDMDR,
EXDMA Source Address Register (EDSAR): When the EDSAR address is accessed as the
transfer source, after the EDSAR value is output, EDSAR is updated with the address to be
accessed next. Bits SAT1 and SAT0 in EDACR specify incrementing or decrementing. The
address is fixed when SAT1 = 0, incremented when SAT1 = 1 and SAT0 = 0, and decremented
when SAT1 = 1 and SAT0 = 1.
The size of the increment or decrement is determined by the size of the data transferred. When the
DTSIZE bit in EDMDR = 0, the data is byte-size and the address is incremented or decremented
by 1; when DTSIZE = 1, the data is word-size and the address is incremented or decremented by
2.
When a repeat area setting is made, the operation conforms to that setting. The upper part of the
address set for the repeat area function is fixed, and is not affected by address updating.
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