The following table describes the power modes available for the device.
Table 26-1. Power modes
Mode
Description
RUN
The MCU can be run at full speed and the internal supply is fully regulated, that is, in run regulation.
This mode is also referred to as Normal Run mode.
HSRUN
The MCU can be run at a faster frequency compared with RUN mode and the internal supply is fully
regulated. See the Power Management chapter for details about the maximum allowable
frequencies.
WAIT
The core clock is gated off. The system clock continues to operate. Bus clocks, if enabled, continue
to operate. Run regulation is maintained.
STOP
The core clock is gated off. System clocks to other masters and bus clocks are gated off after all
stop acknowledge signals from supporting peripherals are valid.
VLPR
The core, system, bus, and flash clock maximum frequencies are restricted in this mode. See the
Power Management chapter for details about the maximum allowable frequencies.
VLPW
The core clock is gated off. The system, bus, and flash clocks continue to operate, although their
maximum frequency is restricted. See the Power Management chapter for details on the maximum
allowable frequencies.
VLPS
The core clock is gated off. System clocks to other masters and bus clocks are gated off after all
stop acknowledge signals from supporting peripherals are valid.
26.4 Memory map and register descriptions
Information about the registers related to the system mode controller can be found here.
Different SMC registers reset on different reset types. Each register's description provides
details. For more information about the types of reset on this chip, refer to the Reset
section details.
NOTE
The SMC registers can be written only in supervisor mode.
Write accesses in user mode are blocked and will result in a bus
error.
NOTE
Before executing the WFI instruction, the last register written to
must be read back. This ensures that all register writes
associated with setting up the low power mode being entered
have completed before the MCU enters the low power mode.
Failure to do this may result in the low power mode not being
entered correctly.
Chapter 26 System Mode Controller (SMC)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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