GPIO High-Speed Option - Not Available on PC13-15

zhiyongwoo · ‎2020-06-23

Hi All,

I am trying to set a few GPIO speed to High Speed but I was struct when PC13-15 are only able to set to Low Speed. May I know is this the STM32CubeMx bugs?

Or it is the STM32F446RE limitation? Please help.

Many Thanks

zhiyongwoo · ‎2020-06-23

Section 5.1.12 (Power Supplies).

In the NUCLEO-64, PC13 is use to read User Button and PC14 and PC15 is connected to OSC32 crystal.

So I think due to the RTC HW configuration, it is restricted to run at a lower Clock Speed. I think 2 MHz still okay for my application as I would need the signal to rise in less than 100nS.

View solution in original post

Andreas Bolsch · ‎2020-06-23

RM, section 5.1.2. That's similar for most (all?) STM32 derivatives.

zhiyongwoo · ‎2020-06-23

Section 5.1.12 (Power Supplies).

In the NUCLEO-64, PC13 is use to read User Button and PC14 and PC15 is connected to OSC32 crystal.

So I think due to the RTC HW configuration, it is restricted to run at a lower Clock Speed. I think 2 MHz still okay for my application as I would need the signal to rise in less than 100nS.