(Debug modules are discussed separately; see Debug in Low Power Modes.) Number
ratings (such as 4 MHz and 1 Mbps) represent the maximum frequencies or maximum
data rates per mode. Also, these terms are used:
• FF = Full functionality. In VLPR and VLPW the system frequency is limited, but if a
module does not have a limitation in its functionality, it is still listed as FF.
• Async operation = Fully functional with alternate clock source, provided the selected
clock source remains enabled
• static = Module register states and associated memories are retained.
• powered = Memory is powered to retain contents.
• low power = Memory is powered to retain contents in a lower power state
• OFF = Modules are powered off; module is in reset state upon wakeup. For clocks,
OFF means disabled.
• wakeup = Modules can serve as a wakeup source for the chip.
Table 7-2. Module operation in low power modes
Modules VLPR VLPW Stop VLPS LLS VLLSx
Core modules
NVIC FF FF static static static OFF
System modules
Mode Controller FF FF FF FF FF FF
LLWU
1
static static static static FF FF
2
Regulator low power low power ON low power low power low power in
VLLS3, OFF in
VLLS0/1
LVD disabled disabled ON disabled disabled disabled
Brown-out
Detection
ON ON ON ON ON ON in VLLS1/3,
optionally
disabled in
VLLS0
3
DMA FF
Async operation
in CPO
FF Async operation Async operation static OFF
Watchdog FF
static in CPO
FF static
FF in PSTOP2
static static OFF
Clocks
1kHz LPO ON ON ON ON ON ON in VLLS1/3,
OFF in VLLS0
System
oscillator (OSC)
OSCERCLK
max of 16MHz
crystal
OSCERCLK
max of 16MHz
crystal
OSCERCLK
optional
OSCERCLK
max of 16MHz
crystal
limited to low
range/low power
limited to low
range/low power
in VLLS1/3, OFF
in VLLS0
Table continues on the next page...
Module Operation in Low Power Modes
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
144 Freescale Semiconductor, Inc.
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