Since the DMA wakeup will enable the clocks and negate the stop mode signals to all bus
masters and slaves, software needs to ensure that bus masters and slaves that are not
involved with the DMA wake-up and transfer remain in a known state. That can be
accomplished by disabling the modules before entry into the low power mode or by
setting the Doze enable bit in selected modules.
Once the DMA request that initiated the wake-up negates and the DMA completes the
current transfer, the device will transition back to the original low-power mode. This
includes requesting all non-CPU bus masters to enter Stop mode and then requesting bus
slaves to enter Stop mode. In STOP and VLPS modes, SCG and PMC would then also
enter their appropriate modes.
NOTE
If the requested DMA transfer cannot cause the DMA request
to negate, then the device will remain in a higher power state
until the low power mode is fully exited.
An enabled DMA wake-up can cause an aborted entry into the low power mode, if the
DMA request asserts during the stop mode entry sequence (or reentry if the request
asserts during a DMA wakeup) and can cause the SMC to assert its Stop Abort flag. Once
the DMA wake-up completes, entry into the low power mode will restart.
An interrupt that occurs during a DMA wake-up will cause an immediate exit from the
low power mode (this is optional for Compute Operation) without impacting the DMA
transfer.
A DMA wake-up can be generated by either a synchronous DMA request or an
asynchronous DMA request. Not all peripherals can generate an asynchronous DMA
request in stop modes, although in general if a peripheral can generate synchronous DMA
requests and also supports asynchronous interrupts in stop modes, then it can generate an
asynchronous DMA request.
25.2.4 Power domains
The following table describe the power domain of this device.
Table 25-2. Power domain summary
Domain name
Description
5V
5V domain is powered by VDD/VSS directly. It contains GPIO
and PMC.
VDDA
Analog domain is powered by VDDA/VSSA. It contains
analog modules such as ADC and CMP.
Table continues on the next page...
Chapter 25 Power Management
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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