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Arm CPU mode
MCU mode
RUN
RUN/VLPR
Deep Sleep
Stop/VLPS
In addition, MCUs also augment Stop and Run modes in a number of ways. The power
management controller (PMC) contains a run and a stop mode regulator. Run regulation
is used in normal run and stop modes. Stop mode regulation is used during all very low
power and low leakage modes. During stop mode regulation, the bus frequencies are
limited in the very low power modes.
The SMC provides the user with multiple power options. The Very Low Power Run
(VLPR) mode can drastically reduce run time power when maximum bus frequency is
not required to handle the application needs. From Normal Run mode, the Run Mode
(RUNM) field can be modified to change the MCU into VLPR mode when limited
frequency is sufficient for the application. From VLPR mode, a corresponding stop
(VLPS) mode can be entered.
Depending on the needs of the user application, a variety of stop modes are available that
allow the state retention, partial power down or full power down of certain logic and/or
memory. I/O states are held in all modes of operation. Several registers are used to
configure the various modes of operation for the device.
The following table describes the power modes available for the device.
Table 35-1. Power modes
Mode
Description
RUN
The MCU can be run at full speed and the internal supply is fully regulated, that is, in run regulation.
This mode is also referred to as Normal Run mode.
HSRUN
The MCU can be run at a faster frequency compared with RUN mode and the internal supply is fully
regulated. See the Power Management chapter for details about the maximum allowable
frequencies.
STOP
The core clock is gated off. There are two variants of stop mode - STOP1 and STOP2 . In STOP1
system clock as well as bus clocks are gated . In STOP2 bus clocks keep running whereas system
clocks are gated.
VLPR
The core, system, bus, and flash clock maximum frequencies are restricted in this mode. See the
Power Management chapter for details about the maximum allowable frequencies.
VLPS
The core clock is gated off. System clocks to other masters and bus clocks are gated off after all
stop acknowledge signals from supporting peripherals are valid.
NOTE
If the system clock is changed during the mode transition, the
recommendation is to stall the communications for all the
peripherals.
Modes of operation
MWCT101xS Series Reference Manual, Rev. 3, 07/2019
942
NXP Semiconductors
Summary of Contents for MWCT101 S Series
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Page 50: ...Conventions MWCT101xS Series Reference Manual Rev 3 07 2019 50 NXP Semiconductors...
Page 70: ...Aliased bit band regions MWCT101xS Series Reference Manual Rev 3 07 2019 70 NXP Semiconductors...
Page 78: ...Pinout diagrams MWCT101xS Series Reference Manual Rev 3 07 2019 78 NXP Semiconductors...
Page 96: ...WCT101xS safety concept MWCT101xS Series Reference Manual Rev 3 07 2019 96 NXP Semiconductors...
Page 130: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 130 NXP Semiconductors...
Page 284: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 284 NXP Semiconductors...
Page 430: ...Functional Description MWCT101xS Series Reference Manual Rev 3 07 2019 430 NXP Semiconductors...
Page 472: ...Application Information MWCT101xS Series Reference Manual Rev 3 07 2019 472 NXP Semiconductors...
Page 528: ...Module clocks MWCT101xS Series Reference Manual Rev 3 07 2019 528 NXP Semiconductors...
Page 634: ...SRAM configuration MWCT101xS Series Reference Manual Rev 3 07 2019 634 NXP Semiconductors...
Page 818: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 818 NXP Semiconductors...
Page 960: ...Functional description MWCT101xS Series Reference Manual Rev 3 07 2019 960 NXP Semiconductors...
Page 992: ...ADC calibration scheme MWCT101xS Series Reference Manual Rev 3 07 2019 992 NXP Semiconductors...
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Page 1726: ...Debug and security MWCT101xS Series Reference Manual Rev 3 07 2019 1726 NXP Semiconductors...
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