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).