LG KU730 Service Manual page 39

3. TECHNICAL BRIEF
3.8.10 General-Purpose Input/Output Interface
The MSM6275 device has general-purpose bidirectional input/output pins. Some of the GPIO pins
have alternate functions supported on them. The alternate functions include USB interface, additional
RAM, ROM, general-purpose chip selects, parallel LCD interface, and a UART
interface. The function of these pins is documented in the various software releases.
3.8.11 UART
The MSM6275 device employs three UARTs. UART1 has dedicated pins while UART2 and UART3
share multiplexed pins.
• UART1 for data
• UART2 (can be used for USIM interface)
• UART3 (can be used for PM SBI interface)
3.8.11 USB
The MSM6275 device integrates a universal serial bus (USB) controller that supports both
unidirectional and bidirectional transceiver interfaces. The USB controller acts as a USB peripheral
communicating with the USB host.
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