SH7709S Datasheet, PDF (416/807 Pages) Renesas Technology Corp – Renesas 32-Bit RISC Microcomputer Super RISC engine Family/SH7700 Series

11.3.6 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 to 1. 16-byte transfer
cannot be used. Figure 11.22 shows this operation. Figure 11.23 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 11.22 Source Address Reload Function Diagram
Rev. 5.00, 09/03, page 372 of 760