A module capable of providing an asynchronous interrupt to the device takes the deviceout of STOP mode and returns the device to normal RUN mode. Refer to the device'sPower Management chapter for peripheral, I/O, and memory operation in STOP mode.When an interrupt request occurs, the CPU exits STOP mode and resumes processing,beginning with the stacking operations leading to the interrupt service routine.A system reset will cause an exit from STOP mode, returning the device to normal RUNmode via an MCU reset.14.5.5.2 Very-Low-Power Stop (VLPS) modeThe two ways in which VLPS mode can be entered are listed here.• Entry into stop via the sleep-now or sleep-on-exit with the SLEEPDEEP bit set in theSystem Control Register in the ARM core while the MCU is in VLPR mode andPMCTRL[STOPM] = 010 or 000.• Entry into stop via the sleep-now or sleep-on-exit with the SLEEPDEEP bit set in theSystem Control Register in the ARM core while the MCU is in normal RUN modeand PMCTRL[STOPM] = 010. When VLPS is entered directly from RUN mode, exitto VLPR is disabled by hardware and the system will always exit back to RUN.In VLPS, the on-chip voltage regulator remains in its stop regulation state as in VLPR.A module capable of providing an asynchronous interrupt to the device takes the deviceout of VLPS and returns the device to VLPR mode.A system reset will also cause a VLPS exit, returning the device to normal RUN mode.14.5.5.3 Low-Leakage Stop (LLS) modeLow-Leakage Stop (LLS) mode can be entered from normal RUN or VLPR modes.The MCU enters LLS mode if:• In Sleep-Now or Sleep-On-Exit mode, SLEEPDEEP is set in the System ControlRegister in the ARM core, and• The device is configured as shown in Table 14-2.In LLS, the on-chip voltage regulator is in stop regulation. Most of the peripherals are putin a state-retention mode that does not allow them to operate while in LLS.Before entering LLS mode, the user should configure the Low-Leakage Wake-up(LLWU) module to enable the desired wake-up sources. The available wake-up sourcesin LLS are detailed in the chip configuration details for this device.Functional descriptionKL27 Sub-Family Reference Manual , Rev. 5, 01/2016238 Freescale Semiconductor, Inc.
