LG L240 Service Manual page 23

3. Circuit Description
3.3.5 UART Interface
LG240 has Three UART Drivers as follow :
- UART1 : USB
- UART2 : ETM, Calibration
- UART3 : AT command, Fax_modem, Bluetooth
UART1(USB)
Resource
USB_DP
USB_DM
USB_PWR
VBUS
UART2 (ETM)
DEBUG_RX
DEBUG_TX
UART3 (Bluetooth)
UART3_RXD
UART3_TXD
UART3_RTS
UART3_CTS
3.3.6 GPIO Map
In total 21 allowable resources, LG240 is using 17 resources except 4 resources dedicated to
Sysboot and Memory. LG2400 GPIO(General Purpose Input/Output) Map, describing application, I/O
state, and enable level, is shown in below table 3.
Name
DP
DM
POWER
VBUS
RX
TX
UART3_RXD
UART3_TXD
UART3_RTS
UART3_CTS
<Table.2> UART Interface Spec
- 24 -
Description
Data
Data
USB_POWER
USB_Detect
Receive Data(UART2)
Transmit Data(UART2)
Receive Data
Transmit Data
Request To Send
Clear To Send