
ST72321xx-Auto Power saving modes
Doc ID 13829 Rev 1 63/243
Figure 23. Slow mode clock transitions
8.3 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 the following Figure 24.
00 01
SMS
CP1:0
f
CPU
NEW SLOW
NORMAL RUN MODE
MCCSR
FREQUENCY
REQUEST
REQUEST
f
OSC2
f
OSC2/2
f
OSC2/4
f
OSC2
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