Table 25-1. Chip power modes (continued)
Chip mode
Description
Core mode
Normal
recovery
method
VLPS (Very Low
Power Stop)-via
WFI
Same as Stop mode, but PMC_REGSC register provides options to
gate off unused modules and further reduce power in low power mode.
Sleep Deep
Interrupt
25.2.1 Run mode
Run mode is the default mode after reset, and refers to any mode in which CPU execution
is possible. Depending on the on-chip regulator settings, Run mode has the following
configurations:
• HSRUN mode — The on-chip regulator voltage output is slightly elevated. The 1.2V
domain is powered by 1.4V instead. This allows the MCU digital modules to operate
at a faster frequency.
• Normal RUN 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 RUN mode — The on-chip regulator voltage is in Low Power
mode. The MCU digital modules should operate at a limited frequency but with
much lower power.
Run mode configurations can be selected by configuring
.
The following sections describe optimizing power in Run modes.
25.2.1.1 Clock Gating
To conserve power, the clocks to most modules can be turned off using CGC bit of the
peripheral control registers in the PCC module. These bits are cleared after any reset,
which disables the clock to the corresponding module. Prior to initializing a module, set
the corresponding bit in the PCC peripheral control register to enable the clock. Before
turning off the clock, make sure to disable the module. For more details, refer to the clock
distribution and PCC chapters.
25.2.1.2 Compute Operation
Chapter 25 Power Management
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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