Chapter 34
Power Management
34.1 Introduction
This chapter describes the various chip power modes and functionality of the individual
modules in these modes.
34.2 Power modes description
The Power Management Controller (PMC) provides multiple power options allowing
users 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 maintained during all power modes. The following
table compares the various power modes available.
For Run and Very Low Power Run (VLPR) modes there are corresponding Stop modes.
Stop modes (VLPS, STOP1, STOP2) are similar to Arm sleep deep mode. VLPR
operating mode can reduce runtime power when maximum bus frequency is not required
to support application needs.
This chip cannot enter a stop mode directly from High Speed Run (HSRUN) mode. To
enter a stop mode from HSRUN, the chip must first transition to Normal Run mode.
After that, it can enter a stop mode.
The two primary modes of operation are Run, Stop. The Wait For Interrupt (WFI)
instruction invokes Stop modes for the chip. The available power modes allow an
application to consume only the power that is necessary for execution.
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