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Chapter 16
System Mode Controller (SMC)
16.1 Introduction
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 and ColdFire+ MCUs
using the SMC.
16.2 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 Freescale
microcontrollers.
The following table shows the translation between the ARM CPU modes and the
Freescale MCU power modes.
Freescale Semiconductor, Inc.
KV4x Reference Manual, Rev. 2, 02/2015
Preliminary
for further details on
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