Wait Mode; Figure 23. Slow Mode Clock Transitions - STMicroelectronics ST72361 Auto Series Manual

Power saving modes
In this mode, the master clock frequency (f
and peripherals are clocked at this lower frequency (f
Note: SLOW-WAIT mode is activated by entering WAIT mode while the device is in SLOW mode.

Figure 23. SLOW mode clock transitions

7.3

Wait mode

WAIT mode places the MCU in a low power consumption mode by stopping the CPU.
This power saving mode is selected by calling the 'WFI' instruction.
All peripherals remain active. During WAIT mode, the I[1:0] bits of the CC register are forced
to '10', to enable all interrupts. All other registers and memory remain unchanged. The MCU
remains in WAIT mode until an interrupt or RESET occurs, whereupon the Program Counter
branches to the starting address of the interrupt or Reset service routine.
The MCU will remain in WAIT mode until a Reset or an Interrupt occurs, causing it to wake
up.
Refer to
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Figure 24
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OSC2
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OSC2 OSC2
f
CPU
f
OSC2
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CP1:0
SMS
NORMAL RUN MODE
NEW SLOW
FREQUENCY
REQUEST
Doc ID 12468 Rev 3
ST72361xx-Auto
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CPU
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OSC2
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