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NOTE
• The load current should only change slowly (by peripheral
modules being turned on/off, and clock speed being
changed) in low power modes.
• Before entering low power modes, the peripheral clock
frequencies should be set to desired values, for the modules
working in 1.2 V power domain (see
, e.g. Boot
ROM, FlexIO, LPIT, LPTMR and communication
modules).
24.5.1 Peripheral doze
Several peripherals support a Peripheral Doze mode, where a register bit can be used to
disable the peripheral for the duration of a low-power mode. The flash memory can also
be placed in a low-power state during Peripheral Doze via a register bit in the SIM.
Peripheral Doze is defined to include all of the modes of operation listed below.
• The CPU is in Wait mode.
• The CPU is in Stop mode, including the entry sequence and for the duration of a
DMA wakeup.
• The CPU is in Compute Operation, including the entry sequence and for the duration
of a DMA wakeup.
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.
Chapter 24 Power Management
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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Summary of Contents for Kinetis KE1xZ256
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