
376
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.
SAR2
(initial value)
DMAC
Transfer
request
DMAC control
Reload control
4 time
count
CHCR2
DMATCR2
SAR2
RO bit = 1
Count signal
Reload
signal
Reload signal
Address b
u
s
Figure 11.22 Source Address Reload Function Diagram
Summary of Contents for SH7709S
Page 2: ...Hitachi SuperH RISC engine SH7709S Hardware Manual ADE 602 250 Rev 1 0 09 21 01 Hitachi Ltd ...
Page 75: ...56 ...
Page 107: ...88 ...
Page 125: ...106 ...
Page 139: ...120 ...
Page 203: ...184 ...
Page 245: ...226 ...
Page 411: ...392 ...
Page 609: ...590 ...
Page 635: ...616 ...
Page 663: ...644 ...
Page 679: ...660 ...