Asynchronous Prescaler RTC STM32F103xx cannot be set higher than 127 in STM32CubeMX

[WilkoL]

The STM32F103 does not have a Synchronous Prescaler. and the Asynchronous Prescaler can be set to (2^20 - 1) in the MCU.

But STM32CubeMX doesn't allow a number higher than 127. Not really a problem of course, just a bit confusing. 

[TDK]

Seems like a bug in CubeMX.

Some other families limit the asynchronous prescaler to 127, which is where the restriction comes in.

[WilkoL]

Those other families likely have a second Synchronous prescaler, the STM32F103 (all STM32F1xx ?) does not. So yes, it is a shortcoming in STM32CubeMX.

[Khouloud ZEMMELI · Accepted solution]

Hi @Community member​ ,

You're right, issue will be fixed.

Thanks for your feedback 🙂

Khouloud