Table 25-4. Module operation in low power modes (continued)
Modules
VLPR
VLPW
Stop
VLPS
FF in PSTOP2
12-bit DAC
FF
static in CPO
FF
static
FF in PSTOP2
static
Human-machine interfaces
GPIO
FF
static in CPO
FF
static output, wakeup
input
FF in PSTOP2
static output, wakeup
input
1. SRAM is writable and readable in VLPR mode.
2. FlexRAM enabled as EEPROM is not writable in VLPR and writes are ignored. Read accesses to FlexRAM as EEPROM
while in VLPR are allowed. There are no access restrictions for FlexRAM configured as traditional RAM.
3. CMP in stop or VLPS supports low speed external pin to pin or external pin to DAC compares. Windowed, sampled and
filtered modes of operation are not available while in stop or VLPS modes.
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).
25.5.1 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
Chapter 25 Power Management
Kinetis KE1xF Sub-Family Reference Manual, Rev. 4, 06/2019
NXP Semiconductors
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