Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Data Sheet
Product codes
ATSAM4L-XSTK
572
42023E–SAM–07/2013
ATSAM4L8/L4/L2
23.8
Module Configuration
The specific configuration for each GPIO instance is listed in the following tables. The module
bus clocks listed here are connected to the system bus clocks. Refer to
bus clocks listed here are connected to the system bus clocks. Refer to
for details.
The reset values for all GPIO registers are zero, with the following exceptions:
Table 23-3.
GPIO Configuration
Feature
48 pin
package
package
64-pin
package
package
100-pin
package
package
Number of GPIO ports
1
2
3
Number of peripheral functions
8
8
8
Table 23-4.
Implemented Pin Functions
Pin Function
Implemented
Notes
Pull-up
On all pins
Controlled by PUER or peripheral
Pull-down
On all pins
Controlled by PDER or peripheral
Slew Rate
On all pins
Controlled by OSRR or peripheral
Drive Strength
On all pins
Controlled by ODCR or peripheral
Schmitt Trigger Enable
On all pins
Controlled by STER or peripheral
Table 23-5.
GPIO Clocks
Clock Name
Description
CLK_GPIO
Clock for the GPIO bus interface
Table 23-6.
Register Reset Values
Port
Register
Reset Value
0
GPER
0xFFFFFFFF
0
PMR0
0x00000008
0
PMR1
0x00000000
0
PMR2
0x00000000
0
PUER
0x00000000
0
GFER
0x00000000
0
PARAMETER
0xFFFFFFFC
0
VERSION
0x00000215
1
GPER
0x0000FFFF
1
PMR0
0x00000000
1
PMR1
0x00000000