A system reset causes an exit from VLPW mode, returning the device to normal RUN
mode.
25.4.5 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.
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)
25.4.5.1 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.
Chapter 25 System Mode Controller (SMC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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Summary of Contents for Kinetis KE1xZ256
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