LM3S5G51 Datasheet, PDF (423/1266 Pages) Texas Instruments – Stellaris® LM3S5G51 Microcontroller

Stellaris^® LM3S5G51 Microcontroller
signals are 5-V tolerant and are connected directly to their circuitry (C0-, C0+, C1-, C1+, USB0VBUS,
USB0ID). These signals are configured by clearing the DEN bit in the GPIO Digital Enable
(GPIODEN) register. All GPIO signals are 5-V tolerant when configured as inputs except for PB0
and PB1, which are limited to 3.6 V. The digital alternate hardware functions are enabled by setting
the appropriate bit in the GPIO Alternate Function Select (GPIOAFSEL) and GPIODEN registers
and configuring the PMCx bit field in the GPIO Port Control (GPIOPCTL) register to the numeric
encoding shown in the table below. Note that each pin must be programmed individually; no type
of grouping is implied by the columns in the table. Table entries that are shaded gray are the default
values for the corresponding GPIO pin.
Important: All GPIO pins are configured as GPIOs and tri-stated by default (GPIOAFSEL=0,
GPIODEN=0, GPIOPDR=0, GPIOPUR=0, and GPIOPCTL=0, with the exception of the
pins shown in the table below. A Power-On-Reset (POR) or asserting RST puts the pins
back to their default state.
Table 9-1. GPIO Pins With Non-Zero Reset Values
GPIO Pins
PA[1:0]
PA[5:2]
PB[3:2]
PC[3:0]
Default State
UART0
SSI0
I²C0
JTAG/SWD
GPIOAFSEL GPIODEN GPIOPDR GPIOPUR
0
0
0
0
0
0
0
0
0
0
0
0
1
1
0
1
GPIOPCTL
0x1
0x2
0x3
0x1
Table 9-2. GPIO Pins and Alternate Functions (100LQFP)
IO
Pin
Analog
Function
1
2
Digital Function (GPIOPCTL PMCx Bit Field Encoding)^a
3
4
5
6
7
8
9
10
11
PA0 26
-
U0Rx
-
-
-
-
-
- I2C1SCL U1Rx
-
-
PA1 27
-
U0Tx
-
-
-
-
-
- I2C1SDA U1Tx
-
-
PA2 28
- SSI0Clk -
-
PWM4
-
-
-
- I2S0RXSD -
-
PA3 29
- SSI0Fss -
-
PWM5
-
-
-
- I2S0RXMCLK -
-
PA4 30
- SSI0Rx -
-
- CAN0Rx -
-
- I2S0TXSCK -
-
PA5 31
- SSI0Tx -
-
- CAN0Tx -
-
- I2S0TXWS -
-
PA6 34
- I2C1SCL CCP1
-
PWM0 PWM4 CAN0Rx - USB0EPEN U1CTS
-
-
PA7 35
- I2C1SDA CCP4
-
PWM1 PWM5 CAN0Tx CCP3 USB0PFLT U1DCD
-
-
PB0 66 USB0ID CCP0 PWM2
-
-
U1Rx
-
-
-
-
-
-
PB1 67 USB0VBUS CCP2 PWM3
-
CCP1 U1Tx
-
-
-
-
-
-
PB2 72
- I2C0SCL IDX0
-
CCP3 CCP0
-
- USB0EPEN -
-
-
PB3 65
- I2C0SDA Fault0 - Fault3 -
-
- USB0PFLT -
-
-
PB4 92 AIN10
-
-
-
U2Rx CAN0Rx IDX0 U1Rx
-
-
-
-
C0-
PB5 91 AIN11 C0o CCP5 CCP6 CCP0 CAN0Tx CCP2 U1Tx
-
-
-
-
C1-
PB6 90 VREFA CCP1 CCP7 C0o Fault1 IDX0 CCP5
-
- I2S0TXSCK -
-
C0+
PB7 89
-
-
-
-
NMI
-
-
-
-
-
-
-
PC0 80
-
-
-
TCK
-
-
-
-
-
-
-
-
SWCLK
January 23, 2012
423
Texas Instruments-Production Data