LG KE520 Service Manual page 28

3.3.5 UART Interface
KE590i has Three UART Drivers as follow :
- UART1 : USB - UART2 : ETM, Calibration - UART3 : AT command, Fax_modem, Bluetooth
UART1(USB)
Resource
TR_USB_DP
TR_USB_DM
USB_PWR
VBUS
UART2 (ETM)
UART2_RX
UART2_TX
UART3 (Bluetooth)
UART3_DSR
UART3_RX
UART3_TX
UART3_RTS
UART3_CTS
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Name
DP
DM
POWER
VBUS
RX
TX
UART3_DSR
UART3_RXD
UART3_TXD
UART3_RTS
UART3_CTS
<Table.2> UART Interface Spec
- 29 -
3. Circuit Description
Description
Data
Data
USB_POWER
USB_Detect
Receive Data(UART2)
Transmit Data(UART2)
Data Set Ready
Receive Data
Transmit Data
Request To Send
Clear To Send
LGE Internal Use Only