LM3S610_06 Datasheet, PDF (112/396 Pages) List of Unclassifed Manufacturers – Microcontroller

General-Purpose Input/Outputs (GPIOs)
GPIO pads and the control register settings required to achieve them. Table 8-2 shows how a
rising edge interrupt would be configured for pin 2 of a GPIO port.
Table 8-1. GPIO Pad Configuration Examples
Register Bit Value^a
Configuration
Digital Input (GPIO)
0
0
0
1
?
?
X
X
X
X
Digital Output (GPIO)
0
1
0
1
?
?
?
?
?
?
Open Drain Input (GPIO)
0
0
1
1
X
X
X
X
X
X
Open Drain Output (GPIO)
0
1
1
1
X
X
?
?
?
?
Open Drain Input/Output (I²C)
1
X
1
1
X
X
?
?
?
?
Digital Input (Timer CCP)
1
X
0
1
?
?
X
X
X
X
Digital Output (PWM)
1
X
0
1
?
?
?
?
?
?
Digital Output (Timer PWM)
1
X
0
1
?
?
?
?
?
?
Digital Input/Output (SSI)
1
X
0
1
?
?
?
?
?
?
Digital Input/Output (UART)
1
X
0
1
?
?
?
?
?
?
a. X=Ignored (don’t care bit)
?=Can be either 0 or 1, depending on the configuration
Table 8-2. GPIO Interrupt Configuration Example
Pin 2 Bit Value^a
Register
Desired Interrupt
Event Trigger
7
6
5
4
3
2
1
0
GPIOIS
0=edge
1=level
X
X
X
X
X
0
X
X
GPIOIBE
0=single edge
1=both edges
X
X
X
X
X
0
X
X
GPIOIEV
0=Low level, or
negative edge
X
X
X
X
X
1
X
X
1=High level, or
positive edge
GPIOIM
0=masked
1=not masked
0
0
0
0
0
1
0
0
a. X=Ignored (don’t care bit)
112
October 8, 2006
Preliminary