21.3.8 Set Enable Request Register (DMA_SERQ)
The SERQ provides a simple memory-mapped mechanism to set a given bit in the ERQ
to enable the DMA request for a given channel. The data value on a register write causes
the corresponding bit in the ERQ to be set. Setting the SAER bit provides a global set
function, forcing the entire contents of ERQ to be set. If the NOP bit is set, the command
is ignored. This allows you to write multiple-byte registers as a 32-bit word. Reads of this
register return all zeroes.
Address: DMA_SERQ is 4000_8000h base + 1Bh offset = 4000_801Bh
Bit
7
6
5
4
3
2
1
0
Read
0
0
0
Write
Reset
0
0
0
0
0
0
0
0
DMA_SERQ field descriptions
Field
Description
7
NOP
0
Normal operation
1
No operation, ignore the other bits in this register
6
SAER
Set All Enable Requests
0
Set only the ERQ bit specified in the SERQ field
1
Set all bits in ERQ
5–4
Reserved
This field is reserved.
3–0
SERQ
Set enable request
Sets the corresponding bit in ERQ
Chapter 21 Direct Memory Access Controller (eDMA)
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
Freescale Semiconductor, Inc.
467
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