ATAVRXPLAIN Datasheet ATAVRXPLAIN | P1-P3

Atmel AVR1924: XMEGA-A1 Xplained Hardware

User's Guide

Features

• Atmel

ATxmega128A1 microcontroller

• External memory

- 8MB SDRAM

• Atmel AT32UC3B1256

- Communication gateway

- Programmer for Atmel AVR

XMEGA

• Analog input (to ADC)

- Temperature sensor

- Light sensor

• Analog output (from DAC)

- Mono speaker via audio amplifier

• Digital I/O

- UART communication through USB gateway

- Eight mechanical button switches

- Eight LEDs

- Eight spare analog pins

- 24 spare digital pins

1 Introduction

The Atmel XMEGA-A1 Xplained evaluation kit is a hardware platform to evaluate

the Atmel ATxmega128A1 microcontroller.

The kit offers a larger range of features that enables the Atmel AVR XMEGA user

to get started using XMEGA peripherals right away and understand how to

integrate the XMEGA device in their own design.

Figure 1-1. XMEGA-A1 Xplained evaluation kit.

8-bit Atmel

Microcontrollers

Application Note

Preliminary

Rev. 8370C-AVR-12/11

Atmel AVR1924

8370C-AVR-12/11

2 Related items

Atmel FLIP (Flexible In-system Programmer)

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3886

Atm

el AVR Studio

4 (free Atmel IDE)

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=2725

Atm

el AVR JTAGICE mkII (on-chip programming and debugging tool)

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=3353

Atm

el AVR ONE! (on-chip programming and debugging tool)

http://www.atmel.com/dyn/products/tools_card.asp?tool_id=4279

3 General information

This document targets the Atmel XMEGA-A1 Xplained evaluation kit, revision 9. The

schematic, layout, and bill of materials can be found online in the zip files associated

with this application note at:

http://www.atmel.com/products/AVR/xplain.as

p?family_id=607&source=redirect.

The XMEGA-A1 Xplained kit is intended to demonstrate the Atmel ATxmega128A1

microcontroller, and the hardware that relates to the Atmel AT32UC3B1256 is,

therefore, not covered in this document.

Figure 3-1. Overview of the XMEGA-A1 Xplained kit.

SDRAM

ATxmega128A1 JTAG and PDI

DataFlash footprint

XMEGA PORT A

USB (COM and PSU)

ATxmega128A1

Speaker

XMEGA PORT C

Audio amp.

XMEGA PORT D/RXMEGA PORT F Power jumper

Light sensor

Temp. sensor

AT32UC3B1256

3.1 Preprogrammed firmware

The Atmel ATxmega128A1 and AT32UC3B1256 that come with the Atmel XMEGA-

A1 Xplained kit are both preprogrammed.

The preprogrammed firmware in the XMEGA plays different sounds when the

mechanical button switches are pushed.

Atmel AVR1924

8370C-AVR-12/11

The preprogrammed Atmel AT32UC3B1256 firmware offers features such as a boot

loader for self-programming and a UART-to-USB gateway.

3.2 Power supply

The kit is powered via the USB connector, which leaves two options to power it:

Connect the kit either to a PC through a USB cable, or to a 5V USB power supply

(AC/DC adapter).

3.3 Measuring the XMEGA power consumption

As part of an evaluation of the Atmel ATxmega128A1, it can be of interest to measure

its power consumption. The power jumper (J300) is connected between the 3.3V

regulated voltage from the regulator and the ATxmega128A1 supply. By replacing the

jumper with an ammeter, it is possible to measure the current consumption of the

ATxmega128A1. No other components are connected to the same supply as the

ATxmega128A1, and other components, therefore, do not affect the measurement of

the ATxmega128A1 current consumption (except the DC leakage in the decoupling

capacitors).

3.4 Programming the XMEGA through the UART-to-USB gateway

The ATxmega128A1 has a pre-programmed UART boot loader. How to program the

device through the UART-to-USB gateway is described in the Atmel application note

“AVR1927: XMEGA-A1 Xplained Getting started guide”.

3.5 Communication through the UART-to-USB gateway

The XMEGA UARTC0 is connected to a UART on the AT32UC3B1256. The

AT32UC3B1256 UART is communicating at 115200 baud, using one start bit, eight

data bits, one stop bit, and no parity.

When the AT32UC3B1256 device is enumerated (connected to a PC), the data

transmitted from the XMEGA is passed on to a (virtual) COM port. This means that it

is possible to use a terminal program to receive the transmitted data on a PC.

Similarly, data transmitted from the PC COM port is passed on to the XMEGA UART

through the gateway.

NOTE The AT32UC3B1256 is also connected to the shared SPI and TWI lines, and so it is

also possible to add TWI and SPI gateway functionality for these serial interfaces, if

desired. This gateway functionality is not available in the default firmware for the

AT32UC3B1256. Please refer to the schematics for more information about these

connections.

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