After wakeup from LLS, the device returns to normal RUN mode with a pending LLWU
module interrupt. In the LLWU interrupt service routine (ISR), the user can poll the
LLWU module wake-up flags to determine the source of the wakeup.
NOTE
The LLWU interrupt must not be masked by the interrupt
controller to avoid a scenario where the system does not fully
exit Stop mode on an LLS recovery.
An asserted RESET pin will cause an exit from LLS mode, returning the device to
normal RUN mode. When LLS is exiting via the RESET pin, RCM_SRS[PIN] and
RCM_SRS[WAKEUP] are set.
9.4.5.4 Very-Low-Leakage Stop (VLLSx) modes
This device contains these very low leakage modes:
• VLLS3
• VLLS1
• VLLS0
VLLSx is often used in this document to refer to all of these modes.
All VLLSx modes can be entered from normal RUN or VLPR modes.
The MCU enters the configured VLLS mode if:
• In Sleep-Now or Sleep-On-Exit mode, the SLEEPDEEP bit is set in the System
Control Register in the ARM core, and
• The device is configured as shown in
In VLLS, the on-chip voltage regulator is in its stop-regulation state while most digital
logic is powered off.
Before entering VLLS mode, the user should configure the Low-Leakage Wake-up
(LLWU) module to enable the desired wakeup sources. The available wake-up sources in
VLLS are detailed in the chip configuration details for this device.
After wakeup from VLLS, the device returns to normal RUN mode with a pending
LLWU interrupt. In the LLWU interrupt service routine (ISR), the user can poll the
LLWU module wake-up flags to determine the source of the wake-up.
When entering VLLS, each I/O pin is latched as configured before executing VLLS.
Because all digital logic in the MCU is powered off, all port and peripheral data is lost
during VLLS. This information must be restored before PMC_REGSC[ACKISO] is set.
Functional description
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
192
Freescale Semiconductor, Inc.
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