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JShan.2
JShan.2
Associate II
March 13, 2020
Question

what is the maximum system clock frequency for STM32F103?

  • March 13, 2020
  • 6 replies
  • 3259 views

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6 replies

Ozone
Ozone
Principal
March 13, 2020

Datasheet ?

JShan.2
JShan.2Author
Associate II
March 13, 2020

sorry, it is my fault. Actually, what I want to ask is what's the maximum system clock frequency for STM32F103's FLASH?​ Because I found there are problems for copy FLASH data to RAM in startup duration since I use high frequency(I use RTOS), but every thing is fun if I use lower system frequency.

Tesla DeLorean
Tesla DeLorean
Guru
March 13, 2020

72 MHz from external 8 MHz HSE, or 64 MHz from internal HSI​

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JShan.2
JShan.2Author
Associate II
March 13, 2020

sorry, it is my fault. Actually, what I want to ask is what's the maximum system clock frequency for STM32F103's FLASH?​ Because I found there are problems for copy FLASH data to RAM in startup duration since I use high frequency(I use RTOS), but every thing is fun if I use lower system frequency.

Ozone
Ozone
Principal
March 13, 2020

Still the datasheet and reference manual.

But to quote from memory, up to 25MHz the flash works without waitstate. For increasing core clock, more waitstates are required.

This was (again quoting from memory) handled in the CMSIS function SystemInit().

If Flash settings are not handled correctly, the system is unstable immedately after winding up the core clock.

Danish1
Danish1
Lead III
March 13, 2020

The datasheet and reference manual say how many wait-states you have to insert for FLASH at high frequencies (and different supply-voltages for many stm32).

Are you having problems before hitting "main" in that variables don't get initialised to their specified staring-values?

Normally your development environment would take care of setting the wait-states for a given processor frequency. Do you specify the frequency there, or do you hack the code it generates?

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