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Peripheral Doze can therefore be used to disable selected bus masters or slaves for the
duration of WAIT or VLPW mode. It can also be used to disable selected bus slaves
immediately on entry into any stop mode (or Compute Operation), instead of waiting for
the bus masters to acknowledge the entry as part of the stop entry sequence. Finally, it
can be used to disable selected bus masters or slaves that should remain inactive during a
DMA wakeup.
If the flash memory is not being accessed during WAIT and PSTOP modes, then the
Flash Doze mode can be used to reduce power consumption, at the expense of a slightly
longer wake-up when executing code and vectors from flash. It can also be used to reduce
power consumption during Compute Operation when executing code and vectors from
SRAM.
5.2.5 Clock gating
To conserve power, the clocks to most modules can be turned off using the SCGCx
registers in the SIM module. The bits of these registers are cleared after any reset, which
disables the clock to the corresponding module. Prior to initializing a module, set the
corresponding bit in the SCGCx register to enable the clock. Before turning off the clock,
make sure to disable the module. For more details, see the
chapters.
5.3 Power modes
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 each run 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.
Chapter 5 Power Management
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
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