For a device, USB-C requires two resistors that older USB ports don't. Declaring yourself as a host/device is also a bit different: USB-C hardware can switch.

For a device, USB-C requires two resistors that older USB ports don't. Declaring yourself as a host/device is also a bit different: USB-C hardware can switch. Micro USB has a "On-the-go" (OTG) indicator pin to indicate host/device. The USB PHY in RP2040 and the RP2350 is actually capable of being a USB host but the Micro USB port's OTG pin is not connected to anything.