ATSAM3S datasheet(24/65 Pages) ATMEL

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6500AS–ATARM–11-Dec-09

SAM3S Summary

Input/Output Lines

The SAM3S has several kinds of input/output (I/O) lines such as general purpose I/Os (GPIO)

and system I/Os. GPIOs can have alternate functionality due to multiplexing capabilities of the

PIO controllers. The same PIO line can be used whether in IO mode or by the multiplexed

peripheral. System I/Os include pins such as test pins, oscillators, erase or analog inputs.

6.1

General Purpose I/O Lines

GPIO Lines are managed by PIO Controllers. All I/Os have several input or output modes such

as pull-up or pull-down, input Schmitt triggers, multi-drive (open-drain), glitch filters, debouncing

or input change interrupt. Programming of these modes is performed independently for each I/O

line through the PIO controller user interface. For more details, refer to the product PIO control-

ler section.

The input output buffers of the PIO lines are supplied through VDDIO power supply rail.

The SAM3S embeds high speed pads able to handle up to 32 MHz for HSMCI (MCK/2), 45 MHz

for SPI clock lines and 35 MHz on other lines. See AC Characteristics Section in the Electrical

Characteristics Section of the datasheet for more details. Typical pull-up and pull-down value is

100 k

Ω for all I/Os.

Each I/O line also embeds an ODT (On-Die Termination), see Figure 6-1. It consists of an inter-

nal series resistor termination scheme for impedance matching between the driver output

(SAM3S) and the PCB trace impedance preventing signal reflection. The series resistor helps to

reduce IOs switching current (di/dt) thereby reducing in turn, EMI. It also decreases overshoot

and undershoot (ringing) due to inductance of interconnect between devices or between boards.

In conclusion ODT helps diminish signal integrity issues.

Figure 6-1.

On-Die Termination

6.2

System I/O Lines

System I/O lines are pins used by oscillators, test mode, reset and JTAG to name but a few.

Described below are the SAM3S system I/O lines shared with PIO lines:

These pins are software configurable as general purpose I/O or system pins. At startup the

default function of these pins is always used.

PCB Trace

Z0 ~ 50 Ohms

Receiver

SAM3 Driver with

Rodt

Zout ~ 10 Ohms

Z0 ~ Zout + Rodt

ODT

36 Ohms Typ.

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