Sorry if this is a noob question but I just wanted to make sure,
the datasheet for the CH32V203 mentions a "Built-in factory-trimmed 8MHz RC oscillator" and a "Built-in PLL, optional CPU clock up to 144MHz", but no mention of tolerances. The datasheet also does not specify anything about crystalless USB.
Do I need to an external crystal if I only plan on using low speed usb (HID input device keyboard)? I have attached the datasheet.