Chapter 17Low-Leakage Wakeup Unit (LLWU)17.1 IntroductionNOTEFor the chip-specific implementation details of this module'sinstances, see the chip configuration information.The LLWU module allows the user to select up to 16 external pins and up to 8 internalmodules as interrupt wake-up sources from low-leakage power modes.The input sources are described in the device's chip configuration details. Each of theavailable wake-up sources can be individually enabled.The RESET pin is an additional source for triggering an exit from low-leakage powermodes, and causes the MCU to exit both LLS and VLLS through a reset flow.The LLWU module also includes two optional digital pin filters for the external wakeuppins.See AN4503: Power Management for Kinetis MCUs for further details on using theLLWU.17.1.1 FeaturesThe LLWU module features include:• Support for up to 16 external input pins and up to 8 internal modules with individualenable bits for MCU interrupt from low leakage modes• Input sources may be external pins or from internal peripherals capable of running inLLS or VLLS. See the chip configuration information for wakeup input sources forthis device.• External pin wake-up inputs, each of which is programmable as falling-edge, rising-edge, or any changeK22F Sub-Family Reference Manual, Rev. 4, 08/2016NXP Semiconductors 379
