Internal osc and USB

[respected]

Posted on December 12, 2013 at 13:31

Hi  friends;

Iwant to use USB without external oscillator. Can I use? If I can use how is it?Thanks

[Tesla DeLorean]

Posted on December 12, 2013 at 13:56

I want to use USB without external oscillator. Can I use? If I can use how is it?

Doesn't it fail basic stability and accuracy requirements to meet the USB spec? Clock selection mechanisms work the same as they would any other time.

[respected]

Posted on December 12, 2013 at 14:24

I don't always use continuoe . I am going to use sometimes. But other functions always work. for  example circuit work at -15C to +50 degree  after then usb will work at 20-25 degree.  Is it avaliable?

[Tesla DeLorean]

Posted on December 12, 2013 at 19:00

Commercial or Amateur?

You don't mention an STM32 part#, but selecting HSI vs HSE, and PLL parameter are generally done in the system_stm32fxxx.c file, and you can configure them in any manner within the documented limits.

[respected]

Posted on December 16, 2013 at 22:55

Thanks for answers;

first time I will try to work ameteur. If I get result successful, maybe I use commercial.