The proprietary and by now ancient DS-mode WiFi is colored yellow, pins are unknown.
I2C eeprom is colored blue:
Monitors HOME button, WiFi switch, 3D slider, volume control slider.
Controls LEDs, various power supplies.
Devices attached to
I2C bus:* UC (master ?)
* Accelerometer (slave address 0x18)
* SoC (master
The MCU uses the [http://mcs.uwsuper.edu/sb/327/Resources/RL78.pdf RL78 ISA].
The MCU uses some custom Special Function Registers, but documentation for much of the hardware protocol/general SFRs can be found [http://courses.ee.sun.ac.za/Computer_Systems_245/Dokumentasie/RL78%20hardware%20manual%20(registers).pdf here].