Toshiba Satellite L300 Maintenance Manual page 27

1.2 System Unit Components
4 GPIOs (GPIO0/GPIO3 are digital GPIO shared with digital MIC interface,
GPIO1/GPIO2 are analog) for customized applications
High quality analog differential CD input
2 jack detection pins each designed to detect up to 4 jacks
Supports hardware digital volume control for digital microphone input
Supports external PCBEEP input and built-in digital BEEP generator
KBC/EC (Keyboard Controller/Embedded Controller)
A KBC WINBOND WPCE775L chip is used to serve as KBC/EC and Super IO:
KBC
EC
Battery EEPROM
24C02 equivalent (128 words x 16 bits, I2C interface) integrated in battery pack
Clock Generator
Realtek RTM880T-797
Modem Controller
Built-in MDC card with Askey / Foxconn / Lite-On. Functions of modem controller:
Digital signal conductor protection
Satellite L300D/L305D/Satellite Pro L300D/EQUIUM L300D/SATEGO L300D
− Scan controller function
− Interface controller function
− Power supply sequence control
− Overheat shutdown support
− LED control
− Beep control
− Device ON/OFF
− Cooling fan speed control
− Universal I/O port
− Battery capacity check
− Flash memory reprogramming function
− EC access interface
− I2C communication control
− Storing records of battery use
− Generating the clock signal required for the system
1 Hardware Overview
Maintenance Manual 15