SAM7X128_14 Datasheet, PDF (219/662 Pages) ATMEL Corporation – ARM-based Flash MCU

27. Parallel Input/Output Controller (PIO)
27.1
Overview
The Parallel Input/Output Controller (PIO) manages up to 32 fully programmable input/output lines. Each I/O line may be
dedicated as a general-purpose I/O or be assigned to a function of an embedded peripheral. This assures effective
optimization of the pins of a product.
Each I/O line is associated with a bit number in all of the 32-bit registers of the 32-bit wide User Interface.
Each I/O line of the PIO Controller features:
 An input change interrupt enabling level change detection on any I/O line.
 A glitch filter providing rejection of pulses lower than one-half of clock cycle.
 Multi-drive capability similar to an open drain I/O line.
 Control of the the pull-up of the I/O line.
 Input visibility and output control.
The PIO Controller also features a synchronous output providing up to 32 bits of data output in a single write operation.
27.2 Block Diagram
Figure 27-1. Block Diagram
AIC
PIO Interrupt
PIO Controller
PMC
PIO Clock
Data, Enable
Embedded
Peripheral
Up to 32
peripheral IOs
Data, Enable
Embedded
Peripheral
Up to 32
peripheral IOs
APB
PIN 0
PIN 1
Up to 32 pins
PIN 31
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
219