SH7729R Datasheet, PDF (462/855 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

12.3.6 Source Address Reload Function
Channel 2 includes a reload function, in which the value is returned to the value set in the source
address register (SAR2) every four transfers by setting the RO bit in CHCR2. 16-byte transfer
cannot be used. Figure 12.24 shows this operation. Figure 12.25 shows a timing chart for the
source address reload function under the following conditions: burst mode, auto-request, 16-bit
transfer data size, SAR2 incremented, DAR2 fixed, reload function on, and use of channel 2 only.
DMAC
DMAC control
Transfer
request
Reload control
4 time
count
RO bit = 1
CHCR2
Count signal
DMATCR2
Reload signal
Reload
signal
SAR2
(initial value)
SAR2
Figure 12.24 Source Address Reload Function Diagram
Rev. 5.0, 09/03, page 416 of 806