
The DMA wakeup is also supported during Compute Operation and causes the CPOACK
status bit to clear and the AIPS peripheral space to be accessible for the duration of the
DMA wakeup. At the completion of the DMA wakeup, the device transitions back into
Compute Operation.
25.2.2 Wait mode
Wait mode refers to a power modes in which the CPU execution is halted. The core clock
is gated off. The system clock continues to operate. Bus clocks, if enabled, continue to
operate.
Depending on the on-chip regulator settings, Wait mode has the following configurations:
• Normal Wait mode — The on-chip regulator voltage output is normal. The 1.2V
domain is powered by 1.2V. This allows the MCU digital modules to operate at a
normal frequency.
• Very Low Power Wait mode — The on-chip regulator voltage is in Low Power
mode. The MCU digital modules must operate at a limited frequency but with much
lower power.
After the CPU executes the WFI/WFE instruction, VLPW mode is entered when MCU is
in VLPR mode and Normal Wait mode is entered when MCU is in Normal Run mode.
Run mode configurations can be selected by configuring
.
can be used to optimize the power in Wait mode. Any interrupt can be used
as a wake up source from the Wait mode. See the "Interrupt vector assignments" table in
Interrupts chapter for all the available interrupt sources.
25.2.3 Stop mode
Stop mode refers to power modes in which the CPU and most peripherals are static. The
SRAM and all registers are retained. The core clock, system clock, and the bus clock are
gated off. NVIC is disabled; AWIC is used to wake up from interrupt. In the Stop mode,
some peripherals can remain operational with asynchronous clock and can wake up the
MCU as needed.
Stop mode configurations can be selected by configuring
In Stop mode, the bus clock is gated as core clock and system clock. This device supports
a partial Stop mode that permits peripherals to run with the bus clock.
Chapter 25 Power Management
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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