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TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-9
V1.1, 2011-05
DMA, V3.03
Figure 11-4 Source Address Update
(m = 0-1)
The transfer count of a DMA transaction, stored in bit field CHCRmn.TREL, can also be
programmed if the DMA transaction is running. At the start of a DMA transaction, TREL
is transferred to bit field CHSRmn.TCOUNT, which is then updated during the DMA
transaction.
No reload of address or counter will be done if TCOUNT is not equal to 0.
The reprogramming of channel specific values (except for the selected address shadow
register) should be avoided while a DMA channel is active.
MCA06152
Write new source
address to (address of)
SADRmn
no
New transaction started ?
&
(ADRCRmn.SHCT = 01
B
)
yes
no
Content of SHADR0n is
transferred into SADRmn.
If ADRCRmn.SHWEN = 0
then
SHADRmn := 00000000
H
yes
Transaction running ?
(CHSRmn.TCOUNT != 0 OR
TRSR.CHmn = 1)
New source address is directly
transferred into
SADRmn
Store new source address
intermediately in
SHADRmn
Содержание TC1784
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