USB INETRFACE OSCILLATOR

[Deepu joy]

Hi , 

I am using STM32L072CBT6 for my project and I need USB interface. 

Is there any option to drive USB using HSI_RC ? 

Also we are using STANDBY_WITH_RTC for low power mode. 

Is there any way to wake up the system from low power mode using USB ?

[TDK]

> Is there any option to drive USB using HSI_RC ? 

Yes, the STM32L0x2 series supports crystal-less USB. Look at the Clock Recovery System in the reference manual.

> Is there any way to wake up the system from low power mode using USB ?

USB interrupts can be used to wake the system from most low power modes.

[Deepu joy]

My issue is not solved. Please check the attached images of CUBEMX CLOCK Configuration. 

[TDK]

Attach your IOC.

[TDK]

As stated in the reference manual, crystal-less USB requires you to use the HSI48 clock. On the CubeMX clock select screen, this is the "RC 48 MHz" clock.