Texas Instruments Stellaris LM3S9D90, User Manual

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July 5, 2011 29
Microcontroller GPIO Assignments
The following table shows the LM3S9D90 GPIOs used by the EK-LM3S9D90 board. All other
GPIOs are available for use and accessible on the test pads.
Table C-1. EK-LM3S9D90 Evaluation Board GPIO Usage
Port Function Board Signal Usage Description
PA0 U0RX VCP_RX
UART
Virtual Communications port receive signal from J2
header. To disconnect from header cut JR1 jumper.
PA1 U0TX VCP_TX
Virtual Communications port transmit signal to J2
header. To disconnect from header cut JR2 jumper.
PB0 USB0ID USBID
USB
USBID signal from the USB-On-the-Go connector J5.
PB1 USB0VBUS VBUS
USB VBUS input signal from USB-OTG connector J5 for
sensing VBUS levels.
PB4 GPIO USR_PBn User
Input from user pushbutton SW2. To disconnect from
pushbutton cut JR3 jumper.
PC0 TCK/SWCLK PC0
JTAG/
SWD
JTAG or SWD clock input
PC1 TMS/SWDIO PC1 JTAG TMS input or SWD bidirectional signal SWDIO
PC2 TDI PC2 JTAG TDI signal input.
PC3 TDO/SWO PC3 JTAG TDO output or SWD trace signal SWO output.
PD0 GPIO USR_LED User
Output to user LED D2. To disconnect from LED cut JR4
jumper.
PF2 LED1 ETH_LED1
Ethernet
Output to RJ45 jack J6 yellow LED. To disconnect from
LED cut JR5 jumper.
PF3 LED0 ETH_LED0
Output to RJ45 jack J6 green LED. To disconnect from
LED cut JR6 jumper.
PH3 USB0EPEN USBPWR
USB
Output to USB-OTG power switch U3. When set high it
enables the USB-OTG power switch to provide USB
VBUS power to USB-OTG connector J5. When set low
power switch U3 is disabled.
PH4 USB0PFLT USBPFLT
Overcurrent input status from USB-OTG power switch
U3. When high the power switch status is normal. When
low an overcurrent condition has been detected by the
switch.
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