The SMC manages the system's entry into and exit from all power modes. This diagram
illustrates the connections of the SMC with other system components in the chip that are
necessary to sequence the system through all power modes.
System
Mode
Controller
(SMC)
System
Power
(PMC)
System
Clocks
(Generator)
LP exit
Flash
CPU
Clock
Control
Module
(CCM)
Module
Memory
Bus masters low power bus (non-CPU)
Bus slaves low power bus
Stop/Wait
CCM low power bus
Enable
PMC low power bus
Flash low power bus
Reset
Control
(RCM)
Module
Figure 25-2. Low-power system components and connections
25.4.2.1 Stop mode entry sequence
Entry into a low-power stop mode (Stop, VLPS) is initiated by a CPU executing the WFI
instruction. After the instruction is executed, the following sequence occurs:
1. The CPU clock is gated off immediately.
2. Requests are made to all non-CPU bus masters to enter Stop mode.
3. After all masters have acknowledged they are ready to enter Stop mode, requests are
made to all bus slaves to enter Stop mode.
4. After all slaves have acknowledged they are ready to enter Stop mode, all system and
bus clocks are gated off.
Chapter 25 System Mode Controller (SMC)
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
NXP Semiconductors
575
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