25.4.3 Run modes
The run modes supported by this device can be found here.
• Run (RUN)
• Very Low-Power Run (VLPR)
25.4.3.1 RUN mode
This is the normal operating mode for the device.
This mode is selected after any reset. When the Arm processor exits reset, it sets up the
stack, program counter (PC), and link register (LR):
• The processor reads the start SP (SP_main) from vector-table offset 0x000
• The processor reads the start PC from vector-table offset 0x004
• LR is set to 0xFFFF_FFFF.
To reduce power in this mode, disable the clocks to unused modules.
25.4.3.2 Very-Low Power Run (VLPR) mode
In VLPR mode, the on-chip voltage regulator is put into a stop mode regulation state. In
this state, the regulator is designed to supply enough current to the MCU over a reduced
frequency. To further reduce power in this mode, disable the clocks to unused modules
using their corresponding clock gating control bits in the PCC's registers.
Before entering this mode, the following conditions must be met:
• All clock monitors in the SCG must be disabled.
• The maximum frequencies of the system, bus, flash, and core are restricted. See the
Power Management details about which frequencies are supported.
• Mode protection must be set to allow VLP modes, that is, PMPROT[AVLP] is 1.
• PMCTRL[RUNM] must be set to 10b to enter VLPR.
• Flash programming/erasing is not allowed.
NOTE
Do not increase the clock frequency while in VLPR mode,
because the regulator is slow in responding and cannot manage
fast load transitions. In addition, do not modify the clock source
in the SCG module or any clock divider registers. Module clock
enables in the PCC can be set, but not cleared.
Chapter 25 System Mode Controller (SMC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
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