SAM4L Datasheet, PDF (533/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
23. General-Purpose Input/Output Controller (GPIO)
Rev: 2.1.5.5
23.1 Features
• Configurable pin-change, rising-edge, or falling-edge interrupt
• Configurable peripheral event generator
• Glitch filter providing rejection of pulses shorter than one clock cycle
• Input visibility and output control
• Multiplexing of peripheral functions on I/O pins
• Programmable internal pull-up resistor
• Programmable internal pull-down resistor
• Programmable output driver strength
• Programmable internal input Schmitt trigger
• Programmable output slew rate
•
23.2 Overview
The General Purpose Input/Output Controller (GPIO) controls the I/O pins of the microcontroller.
Each GPIO pin may be used as a general-purpose I/O or be assigned to a function of an embed-
ded peripheral.
The GPIO is configured using the Peripheral Bus (PB). Some registers can also be configured
using the low latency CPU Local Bus. See Section 23.6.2.9 for details.
42023C–SAM–02/2013
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