NXP Semiconductors K22F series User Manual

DMA_EARS field descriptions (continued)
Field Description
3
EDREQ_3
Enable asynchronous DMA request in stop mode for channel 3.
0 Disable asynchronous DMA request for channel 3.
1 Enable asynchronous DMA request for channel 3.
2
EDREQ_2
Enable asynchronous DMA request in stop mode for channel 2.
0 Disable asynchronous DMA request for channel 2.
1 Enable asynchronous DMA request for channel 2.
1
EDREQ_1
Enable asynchronous DMA request in stop mode for channel 1.
0 Disable asynchronous DMA request for channel 1
1 Enable asynchronous DMA request for channel 1.
0
EDREQ_0
Enable asynchronous DMA request in stop mode for channel 0.
0 Disable asynchronous DMA request for channel 0.
1 Enable asynchronous DMA request for channel 0.
22.3.21 Channel n Priority Register (DMA_DCHPRIn)
When fixed-priority channel arbitration is enabled (CR[ERCA] = 0), the contents of these
registers define the unique priorities associated with each channel. The channel priorities
are evaluated by numeric value; for example, 0 is the lowest priority, 1 is the next higher
priority, then 2, 3, etc. Software must program the channel priorities with unique values;
otherwise, a configuration error is reported. The range of the priority value is limited to
the values of 0 through 15.
Address:
4000_8000h base + 100h offset + (1d × i), where i=0d to 15d
Bit 7 6 5 4 3 2 1 0
Read
ECP DPA
0
CHPRI
Write
Reset
0 0 0 0 * * * *
* Notes:
CHPRI field: See bit field description.•
DMA_DCHPRIn field descriptions
Field Description
7
ECP
Enable Channel Preemption.
0 Channel n cannot be suspended by a higher priority channel’s service request.
1 Channel n can be temporarily suspended by the service request of a higher priority channel.
Table continues on the next page...
Memory map/register definition
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
468 NXP Semiconductors

NXP Semiconductors K22F series Specifications

General

Brand	NXP Semiconductors
Model	K22F series
Category	Controller
Language	English