24.2.1 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:
• 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.
24.2.1.1 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.
24.2.1.2 Compute Operation
Compute Operation is an execution or compute-only mode of operation that keeps the
CPU enabled with full access to the SRAM and Flash read port, but places all other bus
masters and bus slaves into their stop mode. Compute Operation can be enabled in Run
mode or VLPR mode.
NOTE
Do not enter any stop mode without first exiting Compute
Operation.
Because Compute Operation reuses the stop mode logic (including the staged entry with
bus masters disabled before bus slaves), any bus master or bus slave that can remain
functional in stop mode also remains functional in Compute Operation, including
generation of asynchronous interrupts and DMA requests. When enabling Compute
Chapter 24 Power Management
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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