UART Registers
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PSVita has 7 UART ports (devices) numbered from 0 to 6. The i-th port has its base registers address at SceUartReg + i * 0x10000. Known ports are listed in UART Console.
The clock generator configuration for each of these ports is at SceUartClkgenReg + i * 4.
MMIO Interfaces
| Name | Physical address | Size |
|---|---|---|
| SceUartReg | 0xE2030000 | 0x70000 |
| SceUartClkgenReg | 0xE3105000 | 0x1000 |
SceUartReg registers
NOTE: the interface is only 0x80 bytes long, but repeats to fill the 0x10000-byte window allocated to each UART controller.
| Offset | Size | Description |
|---|---|---|
| 0x04 | 4 | Enable port (1 = enable, 0 = disable) |
| 0x10 | 4 | ?? |
| 0x1C | 4 | ?? |
| 0x20 | 4 | ?? |
| 0x28 | 4 | Port status |
| 0x30 | 4 | ?? |
| 0x40 | 4 | ?? A 0 is written here
|
| 0x50 | 4 | ?? |
| 0x54 | 4 | A 0x77F is written here after reading from the FIFO
|
| 0x60 | 4 | ?? |
| 0x64 | 4 | ?? A 0x10001 is written here
|
| 0x68 | 4 | Read FIFO data available |
| 0x70 | 4 | Write FIFO |
| 0x78 | 4 | Read FIFO |
Port status
| Bit(s) | Description |
|---|---|
| 8 | Write FIFO not full (0 = full) |
| 9 | Port ready (0 = busy) |
Read FIFO data available
| Bit(s) | Description |
|---|---|
| 0-5 | Number of words available to read |
| 6-31 | Unused |
SceUartClkgenReg registers
| Offset | Size | Description |
|---|---|---|
| 0x00 | 4 | Clock generator for port 0 |
| 0x04 | 4 | Clock generator for port 1 |
| 0x08 | 4 | Clock generator for port 2 |
| 0x0C | 4 | Clock generator for port 3 |
| 0x10 | 4 | Clock generator for port 4 |
| 0x14 | 4 | Clock generator for port 5 |
| 0x18 | 4 | Clock generator for port 6 |
Register format
| Bits | Description |
|---|---|
| 31:18 | RAZ/WI |
| 17:16 | Input clock selection |
| 0b00: Off
0b01: 3MHz 0b10: ~12MHz 0b11: ~12MHz (same as 0b10?) | |
| 15:00 | Prescaler (integer) |
NOTE: setting the prescaler to zero stops transmission & reception (i.e., baudrate = 0).
Baud rate to SceUartClkgenReg register value
Baud rates in italic indicate the value is approximative (due to the integer prescaler).
| Baud rate | Register value | Notes |
|---|---|---|
| 300 | 0x12710 | 3MHz / 10'000 |
| 600 | 0x11388 | 3MHz / 5'000 |
| 1200 | 0x109C4 | 3MHz / 2'500 |
| 2400 | 0x104E2 | 3MHz / 1'250 |
| 4800 | 0x10271 | 3MHz / 625 |
| 9600 | 0x10139 | 3MHz / 313 |
| 14400 | 0x100D0 | 3MHz / 208 |
| 19200 | 0x1009C | 3MHz / 156 |
| 28800 | 0x10068 | 3MHZ / 104 |
| 38400 | 0x1004E | 3MHz / 78 |
| 57600 | 0x10034 | 3MHz / 52 |
| 115200 | 0x1001A | 3MHz / 26 |
| 230400 | 0x1000D | 3MHz / 13 |
| 250000 | 0x1000C | 3MHz / 12 |
| 460800 | 0x2001A | 12MHz / 26 |
| 921600 | 0x2000D | 12MHz / 13 |
| 3000000 | 0x10001 | 3MHz |