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Clock configuration in STM32CubeMX for STM32L4R5ZI: Why are CPU clocks <= 14 MHz marked as incorrect configuration?

Question asked by Björn Haase on Apr 10, 2018
Latest reply on Apr 11, 2018 by waclawek.jan

In the clock tree configuration for the STM32L4R5ZI the CubeMX tool only allows for frequencies >14 MHz for the HCLK subsystem. For lower clock frequencies the HCLK window is marked in red (illegal configuration).


In the Microcontroller datasheet, however I find data (e.g. regarding power consumption) also for frequencies as low as 100 kHz.


Moreover I observe a bug in the current Eclipse plugin for the CubeMX tool that does not allow for properly specifying the input frequencies of the oscillators. This bug, seems to have been fixed in the plain windows tool. However, the file formats for the .ioc file for the windows and eclipse version seem to be incompatible.


Any idea on how to fix this?


The project has been generated from the default template for the Nucleo144-L4R5ZI board.