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When an interrupt from VLPW occurs, the device returns to VLPR mode to execute the
interrupt service routine.
A system reset will cause an exit from VLPW mode, returning the device to normal RUN
mode.
14.5.5 Stop modes
This device contains a variety of stop modes to meet your application needs.
The stop modes range from:
• a stopped CPU, with all I/O, logic, and memory states retained, and certain
asynchronous mode peripherals operating
to:
• a powered down CPU, with only I/O and a small register file retained, very few
asynchronous mode peripherals operating, while the remainder of the MCU is
powered down.
The choice of stop mode depends upon the user's application, and how power usage and
state retention versus functional needs and recovery time may be traded off.
All clock monitors must be disabled before entering these low-
power modes: Stop, VLPS, VLPR, VLPW, LLSand VLLSx.
The various stop modes are selected by setting the appropriate fields in PMPROT and
PMCTRL. The selected stop mode is entered during the sleep-now or sleep-on-exit entry
with the SLEEPDEEP bit set in the System Control Register in the ARM core.
The available stop modes are:
• Normal Stop (STOP)
• Very-Low Power Stop (VLPS)
• Low-Leakage Stop (LLS)
• Very-Low-Leakage Stop (VLLSx)
14.5.5.1 STOP mode
STOP mode is entered via the sleep-now or sleep-on-exit with the SLEEPDEEP bit set in
the System Control Register in the ARM core.
The MCG module can be configured to leave the reference clocks running.
Freescale Semiconductor, Inc.
NOTE
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Chapter 14 System Mode Controller (SMC)
237
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