LM3S6537 Datasheet, PDF (283/732 Pages) Texas Instruments – ARM and Thumb are registered trademarks and Cortex is a trademark

Stellaris^® LM3S6537 Microcontroller
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
four JTAG/SWD pins (shown in the table below). A Power-On-Reset (POR) or asserting
RST puts the pins back to their default state.
Table 8-1. 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
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
GPIOPCTL
0x1
0x1
0x1
0x3
Table 8-2. GPIO Pins and Alternate Functions (100LQFP)
IO
Pin Number
Multiplexed Function
PA0
26
U0Rx
PA1
27
U0Tx
PA2
28
SSI0Clk
PA3
29
SSI0Fss
PA4
30
SSI0Rx
PA5
31
SSI0Tx
PA6
34
CCP1
PA7
35
CCP4
PB0
66
PWM2
PB1
67
PWM3
PB2
70
I2C0SCL
PB3
71
I2C0SDA
PB4
92
C0-
PB5
91
C1-
PB6
90
C0+
PB7
89
TRST
PC0
80
TCK
PC1
79
TMS
PC2
78
TDI
PC3
77
TDO
PC4
25
CCP5
PC5
24
C1+
PC6
23
CCP3
PD0
10
PWM0
PD1
11
PWM1
PD2
12
U1Rx
PD3
13
U1Tx
PD4
95
CCP0
PD5
96
CCP2
Multiplexed Function
SWCLK
SWDIO
SWO
June 18, 2012
283
Texas Instruments-Production Data