Renesas Stereo System SH7709S User Manual
Rev. 5.00, 09/03, page 372 of 760
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.
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
count
CHCR2
DMATCR2
SAR2
RO bit = 1
Count signal
Reload
signal
Reload signal
Address bus
Figure 11.22 Source Address Reload Function Diagram