• 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.
24.2.3 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.
24.2.3.1 Partial Stop
Partial Stop is a clocking option that can be taken instead of entering Stop mode and is
configured in the SMC Stop Control Register (SMC_STOPCTRL). The Stop mode is
only partially entered, which leaves some additional functionality alive at the expense of
higher power consumption. Partial Stop can be entered from either Run mode or VLP
Run mode.
When configured for PSTOP2, only the core and system clocks are gated and the bus
clock remains active. The bus masters and bus slaves clocked by the system clock enter
Stop mode, but the bus slaves clocked by bus clock remain in Run (or VLP Run) mode.
The clock generators in the SCG and the on-chip regulator in the PMC also remain in
Run (or VLP Run) mode. Exit from PSTOP2 can be initiated by a reset, an asynchronous
Chapter 24 Power Management
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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