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Using USB and SDIO On STM32F4 Without External Crystal or Oscillator

s23
Associate

‎2014-06-18 03:54 AM

Posted on June 18, 2014 at 12:54

Hi,

I am novice in MCU. I am wondering can I use the USB and SDIO on STM32F4 without external crystal? Will the internal oscillator be sufficient?

Thanks.
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Tesla DeLorean
Guru

‎2014-06-18 04:14 AM

Posted on June 18, 2014 at 13:14

I'm not sure the SDIO cares, it just requires that the PLL is running.

For USB and CAN, you can't meet the timing/clock specs with the internal oscillator
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