UART Console

UART0
The UART0 is a debugging console used by ARM, cMep and Syscon. The logic level is 1.8V.

OLED PSVita UART0 location


There are two ways of using UART0:
 * First way is to solder directly to the testpads near the PMIC (yellow and cyan points).


 * Second way is through the multi-connector or the testpads above it (blue and red points). To use the multi-connector points though, you need either to tell Syscon to select Kermit UART (procedure currently unknown) or manually flip the switch (green point to 1.8V).

The switch is controlled by a TS3A5018 chip and the RTS gate is a TC7WG126FK chip.

UART5
The UART5 is a debugging console used for the 3G modem on PS Vita models that have it.

OLED PSVita UART5 location
It is on the PCI-E connector pins 8,10,12,14 is RFR, CTS, TX, RX.
 * On 3G PS Vita units, you can solder to the PCI-E connectors or install yifan lu's PSVSD board.
 * On Wifi PS Vita units, you need to fill in the 88ohm termination resistors (or just short the pads) and some way to enable it (not known yet).

DevKit
In DevKit units, UART is connected to the Communication Processor. Communication Processor seems to manage input/output from sdio (mini-USB) at regular intervals.