NXP Semiconductors K22F series, Reference Manual, Page: 443 / 1407

Bit 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
R
0
EMLM
CLM
HALT
HOE
Reserved
ERCA EDBG
Reserved
W
Reset 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
DMA_CR field descriptions
Field Description
31–18
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
17
CX
Cancel Transfer
0 Normal operation
1 Cancel the remaining data transfer. Stop the executing channel and force the minor loop to finish. The
cancel takes effect after the last write of the current read/write sequence. The CX bit clears itself after
the cancel has been honored. This cancel retires the channel normally as if the minor loop was
completed.
16
ECX
Error Cancel Transfer
0 Normal operation
1 Cancel the remaining data transfer in the same fashion as the CX bit. Stop the executing channel and
force the minor loop to finish. The cancel takes effect after the last write of the current read/write
sequence. The ECX bit clears itself after the cancel is honored. In addition to cancelling the transfer,
ECX treats the cancel as an error condition, thus updating the Error Status register (DMAx_ES) and
generating an optional error interrupt.
15–8
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
7
EMLM
Enable Minor Loop Mapping
0 Disabled. TCDn.word2 is defined as a 32-bit NBYTES field.
1 Enabled. TCDn.word2 is redefined to include individual enable fields, an offset field, and the NBYTES
field. The individual enable fields allow the minor loop offset to be applied to the source address, the
destination address, or both. The NBYTES field is reduced when either offset is enabled.
6
CLM
Continuous Link Mode
NOTE: Do not use continuous link mode with a channel linking to itself if there is only one minor loop
iteration per service request, e.g., if the channel’s NBYTES value is the same as either the source
or destination size. The same data transfer profile can be achieved by simply increasing the
NBYTES value, which provides more efficient, faster processing.
0 A minor loop channel link made to itself goes through channel arbitration before being activated again.
1 A minor loop channel link made to itself does not go through channel arbitration before being activated
again. Upon minor loop completion, the channel activates again if that channel has a minor loop
channel link enabled and the link channel is itself. This effectively applies the minor loop offsets and
restarts the next minor loop.
5
HALT
Halt DMA Operations
0 Normal operation
1 Stall the start of any new channels. Executing channels are allowed to complete. Channel execution
resumes when this bit is cleared.
Table continues on the next page...
Chapter 22 Enhanced Direct Memory Access (eDMA)
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 443