Atmel SAM4L Xplained Pro Starter Kit Atmel ATSAM4L-XSTK ATSAM4L-XSTK Hoja De Datos

42023E–SAM–07/2013

The GPIO controls the I/O pins of the microcontroller. The control logic associated with each pin
is shown in the figure below.

Figure 23-2. Overview of the GPIO

0

1

GPIO_ODMER

0

1

0

1

GPER

1

0

OVR

ODER

PMRn

Periph. Func. A

Periph.Func.  B

Periph. Func. C

PIN

PUER*

PVR

0

1

Glitch Filter

GFER

Edge Detector

1

0

Interrupt Request

IMR1

IMR0

IER

ODCRn*

OSRRn*

Drive strength and slew rate control

STER*

Schmitt trigger

PDER*

Pullup, 

Pulldown and 

buskeeper

...

.

Output

Output 

Enable

Input

*) Register value is overrided if a peripheral function that 
support this function is enabled

IFR