Table 5-1. Chip power modes (continued)
Chip mode
Description
Core mode
Normal
recovery
method
NOTE:
The LLWU interrupt must not be masked by
the interrupt controller to avoid a scenario
where the system does not fully exit stop
mode on an LLS recovery
• All SRAM is operating (content retained and I/O states held).
VLLS3 (Very
Low-Leakage
Stop3)
• Most peripherals are disabled (with clocks stopped), but OSC,
LLWU, LPTMR, RTC, CMP, TSI can be used.
• NVIC is disabled; LLWU is used to wake up.
• SRAM_U and SRAM_L remain powered on (content retained
and I/O states held).
Sleep Deep
Wake-up Reset
VLLS1 (Very
Low-Leakage
Stop1)
• Most peripherals are disabled (with clocks stopped), but OSC,
LLWU, LPTMR, RTC, CMP, TSI can be used.
• NVIC is disabled; LLWU is used to wake up.
• All of SRAM_U and SRAM_L are powered off. The 32-byte
system register file remains powered for customer-critical data.
Sleep Deep
Wake-up Reset
VLLS0 (Very
Low-Leakage
Stop 0)
• Most peripherals are disabled (with clocks stopped), but LLWU,
LPTMR, RTC, TSI can be used.
• NVIC is disabled; LLWU is used to wake up.
• All of SRAM_U and SRAM_L are powered off. The 32-byte
system register file remains powered for customer-critical data.
• LPO disabled, optional POR brown-out detection
Sleep Deep
Wake-up Reset
1. Resumes Normal Run mode operation by executing the LLWU interrupt service routine.
2. Follows the reset flow with the LLWU interrupt flag set for the NVIC.
5.4 Entering and exiting power modes
The WFI instruction invokes wait and stop modes for the chip. The processor exits the
low-power mode via an interrupt.
For LLS and VLLS modes, the wake-up sources are limited to LLWU generated wake-
ups,NMI_b pin, or RESET_b pin assertions. When the NMI_b pin or RESET_b pin have
been disabled through associated FTFA_FOPT settings, then these pins are ignored as
wakeup sources. The wake-up flow from VLLSx is always through reset.
NOTE
The WFE instruction can have the side effect of entering a low-
power mode, but that is not its intended usage. See ARM
documentation for more on the WFE instruction.
On VLLS recoveries, the I/O pins continue to be held in a static state after code execution
begins, allowing software to reconfigure the system before unlocking the I/O. RAM is
retained in VLLS3 only.
Chapter 5 Power Management
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
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