TC1784
Direct Memory Access Controller (DMA)
User´s Manual
11-96
V1.1, 2011-05
DMA, V3.03
SHCT
[17:16] rw
Shadow Control
This bit field determines whether an address is
transferred into the shadow address register when
writing to source or destination address register.
00
B
Shadow address register not used. Source and
destination address register are written directly
01
B
Shadow address register used for source address
buffering. When writing to SADRmx, the address
is buffered in SHADRmx and transferred to
SADRmx with the start of the next DMA
transaction
10
B
Shadow address register used for destination
address buffering. When writing to DADRmx, the
address is buffered in SHADRmx and transferred
to DADRmx with the start of the next DMA
transaction
11
B
Reserved
In case of SHCT = 01
B
or 10
B
, SHCT must not be
changed until the next DMA transaction has been
started.
SHWEN
18
rw
Shadow Address Register Write Enable
This bit determines whether the shadow address
register SHADRmx is read only and automatically set to
0000 0000
H
or if the shadow register can also be directly
written and not modified when and shadow transfer
takes place.
0
B
Shadow address register is read only and the
value stored in the SHADRmx is automatically set
to 0000 0000
H
when the shadow transfer takes
place
1
B
Shadow address register SHADRmx can be read
and can be directly written. The value stored in the
SHADRmx is not automatically modified when the
shadow transfer takes place
0
[31:19] r
Reserved
Read as 0; should be written with 0.
Field
Bits
Type Description
Содержание TC1784
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