Chapter 15
Low-Leakage Wakeup Unit (LLWU)
15.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances see the chip configuration information.
The LLWU module allows the user to select up to 16 external pin sources and up to 8
internal modules as a wakeup source from low-leakage power modes. The input sources
are described in the device's chip configuration details. Each of the available wakeup
sources can be individually enabled.
The LLWU module also includes two optional digital pin filters for the external wakeup
pins.
15.1.1 Features
The LLWU module features include:
• Support for up to 16 external input pins and up to 8 internal modules with individual
enable bits
• Input sources may be external pins or from internal peripherals capable of running in
LLS or VLLS. See the chip configuration information for wakeup input sources for
this device.
• External pin wakeup inputs, each of which is programmable as falling-edge, rising-
edge, or any change
• Wakeup inputs that are activated if enabled after MCU enters a low-leakage power
mode
• Optional digital filters provided to qualify an external pin detect. When entering
VLLS0, the filters are disabled and bypassed.
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 245
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