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build HID keyboard by STM32F072C8T6 without external oscillators?

Question asked by meng.fino.001 on Oct 24, 2015
I am building HID keyboard by STM32F072C8T6, 
can I just build without external 8M&32.768K oscillators to save the layout space? any technical risk?
I don't know if the Clock Recovery System (CRS) circuitry, which could
use the USB SOF signal, is good enough for HID keyboard application?

thanks! 
BR-fino

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