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.
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)
26.5.5.1 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 SCG module can be configured to leave the reference clocks running.
A module capable of providing an asynchronous interrupt to the device takes the device
out of STOP mode and returns the device to normal RUN mode. Refer to the device's
Power Management chapter for peripheral, I/O, and memory operation in STOP mode.
When an interrupt request occurs, the CPU exits STOP mode and resumes processing,
beginning with the stacking operations leading to the interrupt service routine.
A system reset will cause an exit from STOP mode, returning the device to normal RUN
mode via an MCU reset.
26.5.5.2 Very-Low-Power Stop (VLPS) mode
The two ways in which VLPS mode can be entered are listed here.
• Entry into stop via the sleep-now or sleep-on-exit with the SLEEPDEEP bit set in the
System Control Register in the Arm core while the MCU is in VLPR mode and
PMCTRL[STOPM] = 010 or 000.
• Entry into stop via the sleep-now or sleep-on-exit with the SLEEPDEEP bit set in the
System Control Register in the Arm core while the MCU is in normal RUN mode
and PMCTRL[STOPM] = 010. When VLPS is entered directly from RUN mode, exit
to VLPR is disabled by hardware and the system will always exit back to RUN.
In VLPS, the on-chip voltage regulator remains in its stop regulation state as in VLPR.
A module capable of providing an asynchronous interrupt to the device takes the device
out of VLPS and returns the device to VLPR mode.
Chapter 26 System Mode Controller (SMC)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
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