[riot-notifications] [RIOT-OS/RIOT] cpu/stm32: fix wrong max clock for stm32f423xx line (#15831)

Alexandre Abadie notifications at github.com
Thu Jan 21 18:34:39 CET 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
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### Contribution description

This PR provides an obvious fix for max cpu clock of the stm32f423xx cpu line.

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- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure

One should check the value with the datasheet or [the ST website](https://www.st.com/en/microcontrollers-microprocessors/stm32f423zh.html#overview): "The STM32F423xH devices are based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 100 MHz"

Details steps to test your contribution:
- which test/example to compile for which board and is there a 'test' command
- how to know that it was not working/available in master
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### Issues/PRs references

Reported offline by @vincent-d who is using one cpu from this line.

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

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-- Commit Summary --

  * cpu/stm32: fix wrong max clock for stm32f423xx line

-- File Changes --

    M cpu/stm32/kconfigs/f4/Kconfig.lines (2)

-- Patch Links --


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