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 regi ster (SAR2) e very four t ransfers by s e tting 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 bus
Figure 11.22 Source Address Reload Function Diag ram