| Pin | Function | Dir | Inverted | IRQ | Edge | Comments | Init in Rockbox |
| 0 | | In | | IRQ | Any | Power Button (active low) | x |
| 1 | | In | | IRQ | Falling | | |
| 2 | | Out | | | | USB: Renesas RST_N | x |
| 3 | | In | | IRQ | Falling | USB: Renesas INT | x |
| 4 | | Out | | | | CAMERA: I2C? OF sets low - setting high power up 4mA | |
| 5 | | Out | | | | OF sets low - setting high power up 23mA | |
| 6 | | Out | | | | CAMERA: I2C? OF sets low - setting high=no effect - no power change | |
| 7 | | Out | | | | OF sets high - setting low=no effect - no power change | |
| 8 | | In | | IRQ | Falling | Pulses low on USB insert independent of Renesas status | |
| 9 | | In | | IRQ | Falling | | |
| 10 | | Out | | | | ATA: HDD Reset? Reset (active low) | x |
| 11 | | In | Inverted | IRQ | Any | ATA: HDD INT | x |
| 12 | | Out | | | | SPI: RTC Chip Select (348A pin CE) | x |
| 13 | | In | | IRQ | | | |
| 14 | | In | | IRQ | | ADC: TS INT (active low) | x |
| 15 | | Out | | | | ADC: TS nPWD? - setting low reduces power by ~5mA | x |
| 16 | | Out | | | | OF sets low - setting high power up 3 mA | |
| 17 | | Out | | | | POWER: HDD Power (active low) | x |
| 18 | | Out | | | | SPI: TS Chip Select (active low; TSC 2100 pin ~SS) | x |
| 19 | | Out | | | | PhotoLight Enable active high - power up ~120 mA | |
| 20 | | Out | | | | CAMERA: I2C? OF sets low - setting high power up 2 mA | |
| 21 | | Out | | | | OF sets high - setting low=no effect - no power change | |
| 22 | | Out | | | | OF sets high - setting low=no effect - no power change | |
| 23 | | Out | | | | OF sets low - setting high >100mA increase in power? | |
| 24 | | In | | | | | |
| 25 | | In | | | | POWER: Charger Status (active low) | x |
| 26 | | Out | | | | POWER: ALL OFF (active high) (press power twice to turn back on) | x |
| 27 | UART1_RX | In | | | | UART: RX for Remote | x |
| 28 | UART1_TX | Out | | | | UART: TX for Remote | x |
| 29 | | Out | | | | SPI: Backlight Chip Select (active low) | x |
| 30 | I2C _CLK | Out | | | | This appears to be used for the camera | |
| 31 | I2C _DATA | In | | | | ditto | |
| 32 | | Out | | | | LCD: Front LED active high - power up 7 mA | x |
| 33 | | Out | | | | Clicking noise?? Camera shutter? SYSTEM: Buzzer on PWM0 (adds 100mA) | (need x to find initial value) |
| 34 | R2 | Out | | | | LCD: Red bit 2 for 18 bit mode | x |
| 35 | | Out | | | | LCD: Resolution (MO) | x |
| 36 | | Out | | | | LCD: Power enable (low==off) (INI?) | x |
| 37 | | Out | | | | LCD: Backlight and LCD OFF - same as other power down | x |
| 38 | B2 | Out | | | | LCD: Blue bit 2 for 18 bit mode | x |
| 39 | | Out | | | | LCD: Appears to be related to composite output | x |
| 40 | | Out | | | | OF sets low - setting high power up 90 mA | |
