
To reenter Normal Run mode, clear PMCTRL[RUNM]. PMSTAT is a read-only status
register that can be used to determine when the system has completed an exit to RUN
mode. When PMSTAT=RUN, the system is in run regulation and the MCU can run at
full speed in any clock mode. If a higher execution frequency is desired, poll PMSTAT
until it is set to RUN when returning from VLPR mode.
Any reset always causes an exit from VLPR and returns the device to RUN mode after
the MCU exits its reset flow.
26.5.3.3 High Speed Run (HSRUN) mode
In HSRUN mode, the on-chip voltage regulator remains in a run regulation state, but with
a slightly elevated voltage output. In this state, the MCU is able to operate at a faster
frequency compared to normal RUN mode. For the maximum allowable frequencies, see
the Power Management chapter.
While in this mode, the following restrictions must be adhered to:
• The maximum allowable change in frequency of the system, bus, flash or core clocks
is restricted to 2x (double the frequency).
• Stop mode entry is not supported from HSRUN.
• Modifications to clock gating control bits are prohibited.
• Flash programming/erasing is not allowed.
To enter HSRUN mode, set PMPROT[AHSRUN] to allow HSRUN and then set
PMCTRL[RUNM]=HSRUN. Before increasing clock frequencies, the PMSTAT register
should be polled to determine when the system has completed entry into HSRUN mode.
To reenter normal RUN mode, clear PMCTRL[RUNM]. Any reset also clears
PMCTRL[RUNM] and causes the system to exit to normal RUN mode after the MCU
exits its reset flow.
26.5.4 Wait modes
This device contains two different wait modes which are listed here.
• Wait
• Very-Low Power Wait (VLPW)
Chapter 26 System Mode Controller (SMC)
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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