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JBosi
Associate
October 10, 2019
Question

Using STM32F105RBT6 with a 4-pin oscillator?

  • October 10, 2019
  • 4 replies
  • 1271 views

I'm using a STM32F105RBT6 in LQFP64 package in a project. The datasheet suggests using a crystal or resonator. I want to use a 4-pin oscillator that has a single output pin. Is this possible and if so where do I connect it?

Thanks.

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4 replies

Tesla DeLorean
Guru
October 10, 2019

Use OSC_IN pin and select HSE BYPASS mode.

See Nucleo-F1 schematic, where it passes in 8 MHz source from ST-LINK.​

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JBosi
JBosiAuthor
Associate
October 10, 2019

How do I set HSE BYPASS mode?

Tesla DeLorean
Guru
October 10, 2019

When you configure/enable the clock input. Try RCC register descriptions in Reference Manual.​

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waclawek.jan
Super User
October 10, 2019

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