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.
25.4.4 Wait modes
This device contains two different wait modes which are listed here.
• Wait
• Very-Low Power Wait (VLPW)
25.4.4.1 WAIT mode
WAIT mode is entered when the Arm core enters the Sleep-Now or Sleep-On-Exit modes
while SLEEPDEEP is cleared. The Arm CPU enters a low-power state in which it is not
clocked, but peripherals continue to be clocked provided they are enabled.
When an interrupt request occurs, the CPU exits WAIT mode and resumes processing in
RUN mode, beginning with the stacking operations leading to the interrupt service
routine.
A system reset causes an exit from WAIT mode, returning the device to normal RUN
mode.
25.4.4.2 Very-Low-Power Wait (VLPW) mode
VLPW mode is entered by entering the Sleep-Now or Sleep-On-Exit mode while
SLEEPDEEP is cleared and the device is in VLPR mode.
In VLPW, the on-chip voltage regulator remains in its stop regulation state. In this state,
the regulator is designed to supply enough current to the device at a reduced frequency.
To further reduce power in this mode, disable the clocks to unused modules.
VLPR mode restrictions also apply to VLPW.
When an interrupt from VLPW occurs, the device returns to VLPR mode to execute the
interrupt service routine.
Functional description
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
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Содержание Kinetis KE1xZ256
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