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zhiyongwoo
zhiyongwoo
Associate III
Jun 24, 2020 3:50 AM UTC
Solved

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

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.

0693W000001rMFDQA2.png

Many Thanks

This topic has been closed for replies.
zhiyongwoo
zhiyongwooBest answer
Associate III
Jun 24, 2020 6:56 AM UTC

Section 5.1.12 (Power Supplies). 0693W000001rMZcQAM.png

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.

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2 replies

Andreas Bolsch
Andreas Bolsch
Lead III
Jun 24, 2020 5:36 AM UTC

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

zhiyongwoo
zhiyongwooAuthorBest answer
Associate III
Jun 24, 2020 6:56 AM UTC

Section 5.1.12 (Power Supplies). 0693W000001rMZcQAM.png

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.

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