Chapter 15
System Mode Controller (SMC)
15.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances, see the chip configuration information.
The System Mode Controller (SMC) is responsible for sequencing the system into and
out of all low-power Stop and Run modes.
Specifically, it monitors events to trigger transitions between power modes while
controlling the power, clocks, and memories of the system to achieve the power
consumption and functionality of that mode.
This chapter describes all the available low-power modes, the sequence followed to enter/
exit each mode, and the functionality available while in each of the modes.
The SMC is able to function during even the deepest low power modes.
See AN4503: Power Management for Kinetis MCUs for further details on using the
SMC.
15.2
Modes of operation
The ARM CPU has three primary modes of operation:
• Run
• Sleep
• Deep Sleep
The WFI or WFE instruction is used to invoke Sleep and Deep Sleep modes. Run, Wait,
and Stop are the common terms used for the primary operating modes of Kinetis
microcontrollers.
K22F Sub-Family Reference Manual, Rev. 4, 08/2016
NXP Semiconductors 351
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