HD64F7051SFJ20V Datasheet, PDF (208/843 Pages) Renesas Technology Corp – Hardware Manual Renesas 32-Bit RISC

Section 9 Direct Memory Access Controller (DMAC)
9.3.11 Source Address Reload Function
Channel 2 has a source address reload function. This returns to the first value set in the source
address register (SAR2) every four transfers by setting the RO bit of CHCR2 to 1. Figure 9.25
illustrates this operation. Figure 9.26 is a timing chart for reload ON mode, with burst mode,
autorequest, 16-bit transfer data size, SAR2 increment, and DAR2 fixed mode.
DMAC
DMAC control block
Transfer
request
Reload control
4th count
RO bit = 1
CHCR2
Count signal
DMATCR2
Reload signal
Reload
signal
SAR2
(initial value)
SAR2
Figure 9.25 Source Address Reload Function
Rev. 5.00 Jan 06, 2006 page 186 of 818
REJ09B0273-0500