Integration
19.2.3 UART Pin List
The UART interface pins are listed in
. Pin functionality depends on the selected operating
mode of the module.
Table 19-8. UART Pin List
Pin
Type
Description
UARTx_RXD / IRRX / RCRX
I
UART / IrDA / CIR Receive Data
UARTx_TXD / IRTX / RCTX
OZ
UART / IrDA / CIR Transmit Data
UARTx_RTSn / SD
OZ
UART Request to Send / IrDA Mode
UARTx_CTSn
I
UART Clear to Send
UARTx_DTRn
(1)
OZ
UART Data Terminal Ready
UARTx_DSRn
(1)
I
UART Data Set Ready
UARTx_DCDn
(1)
I
UART Data Carrier Detect
UARTx_RIN
(1)
1
UART Ring Indicator
(1)
UART1 only
The UART module can operate in three different modes based on the MODE_SELECT bits. The signal
muxing based on these mode bits is shown in
Table 19-9. UART Muxing Control
UARTx_TXD / IRTX /
UARTx_RXD / IRRX / RCRX
UARTx_RTSn / SD
UARTx_CTSn
Mode
RCTX Function
Function
Function
Function
TXD
RXD
RTSn
CTSn
UART
IRTX
IRRX
SD
not used
IrDA (SIR, MIR, FIR)
RCTX
RCRX
SD
not used
CIR
3452
Universal Asynchronous Receiver/Transmitter (UART)
SPRUH73H – October 2011 – Revised April 2013
Copyright © 2011–2013, Texas Instruments Incorporated