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It's rather annoying that you didn't read the Microchip documents that have been suggested in the previous posts.
Running USB in high speed mode from internal clock isn't possible according to datasheet, probably not accurate enough. You can use an external 8 MHz crystal (also 4, 8, 12, 16, 20, 24, 40, 48 MHz).
Running USB in high speed mode from internal clock isn't possible according to datasheet, probably not accurate enough. You can use an external 8 MHz crystal (also 4, 8, 12, 16, 20, 24, 40, 48 MHz).