DescriptionResetTypeNameBit/Field
GPIO Alternate Function Select
The AFSEL values are defined as follows:
DescriptionValue
Software control of corresponding GPIO line (GPIO mode).0
Hardware control of corresponding GPIO line (alternate
hardware function).
1
Note: The default reset value for the GPIOAFSEL,
GPIOPUR, and GPIODEN registers are 0x0000.0000
for all GPIO pins, with the exception of the five
JTAG/SWD pins (PB7and PC[3:0]). These five pins
default to JTAG/SWD functionality. Because of this,
the default reset value of these registers for GPIO
Port B is 0x0000.0080 while the default reset value
for Port C is 0x0000.000F.
-R/WAFSEL7:0
June 22, 2010166
Texas Instruments-Production Data
General-Purpose Input/Outputs (GPIOs)