Information

Table 7-2. Module operation in low power modes (continued)
Modules Stop VLPR VLPW VLPS LLS VLLSx
Communication interfaces
USB FS/LS static static static static static OFF
USB DCD static FF FF static static OFF
USB Voltage
Regulator
optional optional optional optional optional optional
UART static, wakeup
on edge
125 kbps 125 kbps static, wakeup
on edge
static OFF
SPI static 1 Mbps 1 Mbps static static OFF
I
2
C static, address
match wakeup
100 kbps 100 kbps static, address
match wakeup
static OFF
I
2
S FF with external
clock
7
FF FF FF with external
clock
7
static OFF
Security
CRC static FF FF static static OFF
Timers
FTM static FF FF static static OFF
PIT static FF FF static static OFF
PDB static FF FF static static OFF
LPTMR FF FF FF FF FF FF
8
RTC - 32kHz
OSC
6
FF FF FF FF FF
9
FF
9
CMT static FF FF static static OFF
Analog
16-bit ADC ADC internal
clock only
FF FF ADC internal
clock only
static OFF
CMP
10
HS or LS
compare
FF FF HS or LS
compare
LS compare LS compare in
VLLS1/2/3, OFF
in VLLS0
6-bit DAC static FF FF static static static
VREF FF FF FF FF static OFF
Human-machine interfaces
GPIO wakeup FF FF wakeup static, pins
latched
OFF, pins
latched
TSI wakeup FF FF wakeup wakeup
11
wakeup
11
, 12
1. Using the LLWU module, the external pins available for this chip do not require the associated peripheral function to be
enabled. It only requires the function controlling the pin (GPIO or peripheral) to be configured as an input to allow a
transition to occur to the LLWU.
2. Since LPO clock source is disabled, filters will be bypassed during VLLS0
3. The VLLSCTRL[PORPO] bit in the SMC module controls this option.
4. A 8KB portion of SRAM_U block is left powered on in low power mode VLLS2.
5. 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.
Module Operation in Low Power Modes
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
172 Freescale Semiconductor, Inc.