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35.4.3.2 Very-Low Power Run (VLPR) mode
In VLPR mode, the on-chip voltage regulator is put into a stop mode regulation state. In
this state, the regulator is designed to supply enough current to the MCU over a reduced
frequency. To further reduce power in this mode, disable the clocks to unused modules
using their corresponding clock gating control bits in the PCC's registers.
Before entering this mode, the following conditions must be met:
• All clock monitors in the SCG must be disabled.
• The maximum frequencies of the system, bus, flash, and core are restricted. See the
Power Management details about which frequencies are supported.
• Mode protection must be set to allow VLP modes, that is, PMPROT[AVLP] is 1.
• PMCTRL[RUNM] must be set to 10b to enter VLPR.
• Flash programming/erasing is not allowed.
NOTE
Do not increase the clock frequency while in VLPR mode,
because the regulator is slow in responding and cannot manage
fast load transitions. In addition, do not modify the clock source
in the SCG module or any clock divider registers. Module clock
enables in the PCC can be set, but not cleared.
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.
35.4.3.3 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 ratio of frequency between HSRUN mode and RUN mode for each system, bus,
and flash clocks respectively must be less than or equal to 3.
• Stop mode entry is not supported from HSRUN.
Functional description
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
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NXP Semiconductors
Содержание MWCT101 S Series
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