SH7261 Datasheet, PDF (345/1348 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7260 Series

Section 11 Direct Memory Access Controller (DMAC)
11.3.2 DMA Current Destination Address Register (DMCDADR)
DMCDADR is a register used to specify the start address of the transfer destination.
The value in this register is transferred to the working destination-address register at the start of
DMA transfer.
The default behavior is for the contents of the working destination-address register to be returned
on completion of each single operand transfer. However, the contents of the working destination-
address register are not returned in two cases: when the rotate setting (SAMOD = 011) is made for
the destination address and when the destination-address reload function is enabled. In the latter
case, the contents of the DMA reload destination address register (DMRDADRn) are returned to
this register on completion of DMA transfer.
This register must be set before transfer is initiated, regardless of whether the reload function is
enabled or disabled.
Bit: 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
CDA
Initial value: — — — — — — — — — — — — — — — —
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Bit: 15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
CDA
Initial value: — — — — — — — — — — — — — — — —
R/W: R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W
Initial
Bit
Bit Name Value
R/W Description
31 to 0 CDA
Undefined R/W Holds destination address bits A31 to A0
Notes: 1. Set this register so that DMA transfer is performed within the correctly aligned address
boundaries for the transfer sizes listed below.
• When the transfer size is set to 16 bits (SZSEL = "001"): (b0) = "0".
• When the transfer size is set to 32 bits (SZSEL = "010"): (b1, b0) = (0, 0).
2. Only write to this register when single operand transfer is not in process on the
corresponding channel (the corresponding DASTS bit in the DMA arbitration status
register (DMASTS) is "0") and DMA transfer is disabled (DMST in the DMA activation
control register (DMSCNT) or DEN in DMA control register B for the channel
(DMCNTBn) is set to "0"). Operation is not guaranteed if this register is written to when
both conditions are not satisfied.
Rev. 2.00 Sep. 07, 2007 Page 313 of 1312
REJ09B0320-0200