24.2 Power Modes Description
The power management controller (PMC) provides multiple power options to allow the
user to optimize power consumption for the level of functionality needed.
Depending on the stop requirements of the user application, a variety of stop modes are
available that provide 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. The following table
compares the various power modes available.
For Run and VLPR mode there is a corresponding wait and stop mode. Wait modes are
similar to ARM sleep modes. Stop modes (VLPS, STOP) are similar to ARM sleep deep
mode. The Very Low Power Run (VLPR) operating mode can drastically reduce runtime
power when the maximum bus frequency is not required to handle the application needs.
The three primary modes of operation are Run, Wait and Stop. The WFI instruction
invokes both wait and stop modes for the chip. The primary modes are augmented in a
number of ways to provide lower power based on application needs.
Table 24-1. Chip power modes
Chip mode
Description
Core mode
Normal
recovery
method
Normal Run
Allows maximum performance of chip. Default mode out of reset; on-
chip voltage regulator is on.
Run
-
Normal Wait -
via WFI
Allows peripherals to function while the core is in sleep mode, reducing
power. NVIC remains sensitive to interrupts; peripherals continue to be
clocked.
Sleep
Interrupt
Normal Stop -
via WFI
Places chip in static state. On-chip voltage regulator is in a low power
mode. LVD is off while maintaining LVR and POR protection. NVIC is
disabled; AWIC is used to wake up from interrupt; Peripheral clocks
are stopped. All SRAM is operating (content retained and I/O state
held). ADC and CMP are optional on.
Sleep Deep
Interrupt
VLPR (Very Low
Power Run)
On-chip voltage regulator is in a low power mode that supplies only
enough power to run the chip at a reduced frequency. Reduced
frequency Flash access mode (1 MHz); LVD off; internal oscillator
provides a low power 4 MHz source for the core, the bus and the
peripheral clocks.
Run
-
VLPW (Very
Low Power
Wait) -via WFI
Same as VLPR but with the core in sleep mode to further reduce
power; NVIC remains sensitive to interrupts (FCLK = ON). On-chip
voltage regulator is in a low power mode that supplies only enough
power to run the chip at a reduced frequency.
Sleep
Interrupt
VLPS (Very Low
Power Stop)-via
WFI
Same as Stop mode, but PMC_REGSC register provides options to
gate off unused modules and further reduce power in low power mode.
Sleep Deep
Interrupt
Power Modes Description
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NXP Semiconductors
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