NOTE
Disable a channel’s hardware service request at the source
before clearing the channel’s ERQ bit.
Address: 4000_8000h base + 1Ah offset = 4000_801Ah
Bit
7
6
5
4
3
2
1
0
Read
0
0
0
Write
Reset
0
0
0
0
0
0
0
0
DMA_CERQ field descriptions
Field
Description
7
NOP
No Op enable
0
Normal operation
1
No operation, ignore the other bits in this register
6
CAER
Clear All Enable Requests
0
Clear only the ERQ bit specified in the CERQ field
1
Clear all bits in ERQ
5–4
Reserved
This field is reserved.
CERQ
Clear Enable Request
Clears the corresponding bit in ERQ.
12.3.12 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: 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
Chapter 12 Enhanced Direct Memory Access (eDMA)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
251
Содержание KE1xF Series
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