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STM32L4xx: standby and run mode

Question asked by Paolo Andreuzza on Nov 3, 2017
Latest reply on Nov 3, 2017 by Vangelis Fortounas

Hallo,
Since I think that the use of auto generated code using MXcube helps a lot, I have a question regarding the best workflow to use in the following case.
My board is powered by an external power source. In this state it works at full speed. When the external power source is disconnected, the MCU goes in standby to reduce the power consumtion because, in this state, it is powered by a coin cell. The only thing it has to do is wakeup (using the RTC) every 100 mS to check some gpio and then it has to go again in standby.
there is a gpio that inform the MCU if it is powered by the button battery or by the external supply.
In this case it seems to me that I need of two different MCU setup depending on wich power source is feeding the board.
It is not an easy situation for MXCube, is it?
Ideas?
Thank you in advance.
Paolo

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