Can USB clock source be used for the internal high-speed RC oscillator (HIRC)?

[Henry]

The NuMicro® Nano120 /130 series can use an external low-speed oscillator (LXT) to ensure the accuracy HIRC of to 0.25%, which is compliant with the USB specification.
The NuMicro® NUC121/125 series can use USB SOF(Start of Frame) to ensure the accuracy HIRC of to 0.25%.
The other NuMicro® series need to use an external oscillator as the USB clock source,
Please refer the USB feature of each NuMicro® series for supporting crystal-less or not.