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Core / Peripheral States after wakeup from low power mode

Question asked by Simon Wyss on Jul 31, 2017
Latest reply on Aug 1, 2017 by jeremyzhou

Which peripherals are powered after different low power states?


I found some information in the application note AN11611 and the user-manual UM10850 but I don't know if the RTC is always started after reset from sleep, deep-sleep or power-down mode?
If I use only the IRC as clock, I think the IRC has to start after the sleep, deep-sleep or power-down mode. Because ther is no other clock available.


However, when I switch to the RTC (32kHz) bevor going to sleep, deep-sleep or power-down, what happens on wakeup?
Is the IRC automatically started? Is the main-clock-source automatically switched to the IRC clock?
If not, I would have to switch the main-clock-source manually to IRC (with the 32kHz Clock, using 32us for each CPU cycle)

Thank you in advance for your help!



There seems to be an error in the AN11611 on page 5: The IRC is shutdown in Deep-Sleep according to the user-manual: