CHAPTER 6: Low Power Consumption Mode
FM4 Peripheral Manual, Doc. No. 002-04856 Rev. *E 211
Built-in regulator voltage stabilization wait at return
The CPU automatically secures a voltage stabilization wait time (a few hundred µs) for the operation
mode transition of the built-in regulator before returning from RTC mode. After the voltage stabilization
wait time has lapsed, the CPU executes the return operation.
Notes:
− If the priority of an interrupt used for making the CPU return from RTC mode is not set to a level
for making the CPU return from RTC mode, after an interrupt has been generated, the clock
returns from RTC mode, but the CPU does not return from RTC mode and continues stopping.
Therefore, always set the priority of an interrupt used for making the CPU return from RTC mode
to a level that can make the CPU return from RTC mode.
− Before making the CPU transit to RTC mode, ensure that no factor for returning from RTC mode
shown in Table 3-4 has been set. (include the interrupt pending register in the NVIC) If such
factor has been set, clear that factor.
− If the CPU transits to RTC mode during debugging, as the clock supply to the CPU stops, the
CPU cannot return to a RUN mode by using the ICE. Use a reset or an interrupt to make the CPU
return to a RUN mode.
− Before making the CPU transit to RTC mode, ensure that the Flash memory automatic algorithm
has terminated.
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