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Functional description
14.5.2.2 Stop mode exit sequence
Exit from a low-power stop mode is initiated either by a reset or an interrupt event. The
following sequence then executes to restore the system to a run mode (RUN or VLPR):
1. The on-chip regulator in the PMC and internal power switches are restored.
2. Clock generators are enabled in the MCG.
3. System and bus clocks are enabled to all masters and slaves.
4. The CPU clock is enabled and the CPU begins servicing the reset or interrupt that
initiated the exit from the low-power stop mode.
14.5.2.3 Aborted stop mode entry
If an interrupt occurs during a stop entry sequence, the SMC can abort the transition early
and return to RUN mode without completely entering the stop mode. An aborted entry is
possible only if the interrupt occurs before the PMC begins the transition to stop mode
regulation. After this point, the interrupt is ignored until the PMC has completed its
transition to stop mode regulation. When an aborted stop mode entry sequence occurs,
SMC_PMCTRL[STOPA] is set to 1.
14.5.2.4 Transition to wait modes
For wait modes (WAIT and VLPW), the CPU clock is gated off while all other clocking
continues, as in RUN and VLPR mode operation. Some modules that support stop-in-
wait functionality have their clocks disabled in these configurations.
14.5.2.5 Transition from stop modes to Debug mode
The debugger module supports a transition from STOP, WAIT, VLPS, and VLPW back
to a Halted state when the debugger has been enabled. As part of this transition, system
clocking is re-established and is equivalent to the normal RUN and VLPR mode clocking
configuration.
14.5.3 Run modes
The run modes supported by this device can be found here.
• Run (RUN)
• Very Low-Power Run (VLPR)
234
KL27 Sub-Family Reference Manual , Rev. 5, 01/2016
Freescale Semiconductor, Inc.
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