Low-Leakage Wakeup Unit (LLWU)

Overview

The Kinetis SDK provides a HAL driver for the Low-Leakage Wakeup Unit (LLWU) block of Kinetis devices. The LLWU module allows the user to configure external wakeup pin and internal wakeup modules as a wakeup source from low-leakage power modes.

External Wakeup Pin APIs

Different platforms may have different wakeup pin assignments. Check the reference manual for details. The external wakeup pin can be configured with the function LLWU_HAL_SetExternalInputPinMode().
After wakeup, flags indicate which external pin is the wakeup source. Use the function LLWU_HAL_GetExternalPinWakeupFlag() to check the external pin wakeup flags. The function LLWU_HAL_ClearExternalPinWakeupFlag() clearss the wakeup flags.
For external pins, there is the pin filter. The function LLWU_HAL_SetPinFilterMode() configures the pin filter for a specific pin and configures the filter mode.

Internal Wakeup Module APIs

Different platforms may have different wakeup module assignments. Check the reference manual for details. The internal wakeup module can be enabled/disabled with the function LLWU_HAL_SetInternalModuleCmd().
After wakeup, flags indicate which module is the wakeup source. Use the function LLWU_HAL_GetInternalModuleWakeupFlag() to check the internal module wakeup flags. There is no API to clear internal wakeup module flags. Clear the wakeup source status directly.

Reset Pin Configure APIs

The RESET pin can be configured as a low-leakage mode exit source. The function LLWU_HAL_SetResetPinMode() sets this feature and configures the RESET pin filter.

Files
file	fsl_llwu_hal.h

Data Structures
struct	llwu_external_pin_filter_mode_t
	External input pin filter control structure. More...
struct	llwu_reset_pin_mode_t
	Reset pin control structure. More...

Enumerations
enum	llwu_external_pin_modes_t {   kLlwuExternalPinDisabled,   kLlwuExternalPinRisingEdge,   kLlwuExternalPinFallingEdge,   kLlwuExternalPinChangeDetect }
	External input pin control modes. More...
enum	llwu_filter_modes_t {   kLlwuFilterDisabled,   kLlwuFilterPosEdgeDetect,   kLlwuFilterNegEdgeDetect,   kLlwuFilterAnyEdgeDetect }
	Digital filter control modes. More...

---

Data Structure Documentation

struct llwu_external_pin_filter_mode_t

Data Fields
llwu_filter_modes_t	filterMode
	Filter mode.
llwu_wakeup_pin_t	pinNumber
	Pin number.

struct llwu_reset_pin_mode_t

Data Fields
bool	enable
	RESET pin is enabled as low-leakage mode exit source. More...
bool	filter
	Digital filter on RESET pin. More...

Field Documentation

bool llwu_reset_pin_mode_t::enable

bool llwu_reset_pin_mode_t::filter

Enumeration Type Documentation

enum llwu_external_pin_modes_t

Enumerator
kLlwuExternalPinDisabled	Pin disabled as wakeup input.
kLlwuExternalPinRisingEdge	Pin enabled with rising edge detection.
kLlwuExternalPinFallingEdge	Pin enabled with falling edge detection.
kLlwuExternalPinChangeDetect	Pin enabled with any change detection.

enum llwu_filter_modes_t

Enumerator
kLlwuFilterDisabled	Filter disabled.
kLlwuFilterPosEdgeDetect	Filter positive edge detection.
kLlwuFilterNegEdgeDetect	Filter negative edge detection.
kLlwuFilterAnyEdgeDetect	Filter any edge detection.