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DMA_EARS field descriptions (continued)
Field
Description
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.
13.3.21 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 7.
Address: 4000_8000h base + 100h (1d × i), where i=0d to 7d
Bit
7
6
5
4
3
2
1
0
Read
Write
Reset
0
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.
6
DPA
Disable Preempt Ability.
0
Channel n can suspend a lower priority channel.
1
Channel n cannot suspend any channel, regardless of channel priority.
5–3
Reserved
This field is reserved.
This read-only field is reserved and always has the value 0.
CHPRI
Channel n Arbitration Priority
Channel priority when fixed-priority arbitration is enabled
NOTE: Reset value for the channel priority field, CHPRI, is equal to the corresponding channel number
for each priority register, that is, DCHPRI7[CHPRI] = 0b111.
Memory map/register definition
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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Содержание Kinetis KE1xZ256
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Страница 62: ...Interrupt channel assignments Kinetis KE1xZ256 Sub Family Reference Manual Rev 3 07 2018 62 NXP Semiconductors...
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