UDC
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There is a USB client on handheld Vita devices. It uses a proprietary multi-connector on the OLED (PCH-1XXX) units and a micro-USB on the LCD (PCH-2XXX) units.
PCH-1XXX Pinout
Because of the existence of the USB ethernet adapter, that means there exists a way to use the port in host mode probably through USB OTG or something similar.
PCH-2XXX Pinout
Port is a standard USB micro. Highly likely that USB OTG is supported in hardware although there's no evidence that it's enabled in software.
| Pin | Type | Description |
|---|---|---|
| 1 | VCC | +5V VDC |
| 2 | D+ | Data |
| 3 | D- | Data |
| 4 | ID | USB OTG |
| 5 | GND | Ground |