Chapter 35System Mode Controller (SMC)35.1 IntroductionThe System Mode Controller (SMC) is responsible for sequencing the system into andout of all low-power Stop and Run modes.Specifically, it monitors events to trigger transitions between power modes whilecontrolling the power, clocks, and memories of the system to achieve the powerconsumption 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 theSMC.35.2 Modes of operationThe Arm CPU has three primary modes of operation:• Run• Sleep• Deep SleepThe WFI instruction is used to invoke Sleep and Deep Sleep modes. Run and Stop are thecommon terms used for the primary operating modes. The following table shows thetranslation between the Arm CPU mode and the MCU power modes. RUN is mapped toRUN/VLPR and Deep Sleep is mapped to STOP/VLPS.MWCT101xS Series Reference Manual, Rev. 3, 07/2019NXP Semiconductors 941
