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AVR1907: Xplain Hardware User's Guide

Features

• ATxmega128A1 microcontro ller

• External Memory

- 8MB SDRAM

- 8MB Serial Da ta F lash

• AT90USB1287

- Communication gateway

- Programm er for Atmel® AV R® XMEGA™

• Analog Input (to ADC)

- T emperature sensor

- Potentiometer

• Analog Output (from DAC)

- Mono speaker via audio amplifier

• Digital IO

- UART communication through USB gateway

- 8 micro switch buttons

- 8 L EDs

- 8 spare analog pins

- 8 spare digital pins

1 Introduction

The Xplain evaluation kit is a hardware platform to evaluate the ATxmega128A1.

The kit offers a larger range of features that enables the XMEGA user to get

started using the XMEGA’s peripherals right away and to get an understanding of

how to integrate the XMEGA in their own design.

Figure 1-1. Xplain evaluation kit.

8-bit

Microcontrollers

Application Note

Preliminary

Rev. 8203D-AVR-04/10

2 AVR1907 8203D-AVR-04/10

2 Related Items

FLIP (Flexible In-System Programmer)

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

AVR Studio 4 (Atmel’s free IDE)

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

JTAGICE mkII (On-chip programming and deb ugging tool)

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

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 Xplain evaluation kit revision 3 and parts of the document

may therefore be inconsistent with earlier revisions of the product. For earlier revision

please refer to the schematics, which is this only documentation available for these

revision.

The Xplain kit is intended to demonstrate the ATxmega128A1, and the hardware that

relates to the AT90USB1287 is therefore not covered in this document.

Figure 3-1. Overview of the Xplain kit.

AT90USB1287 JTAG (J200)SDRAM ATxmega128A1 JTAG (J100)

DataFlash

AT90USB1287

XMEGA PORT A (J101)

USB (COM and PSU)

ATxmega128A1

Speaker

XMEGA PORT D (J102)

Audio amp.

Shunt resistor

3.1 Preprogrammed firmware

The Xplain kit comes with both the ATxmega128A1 and the AT90USB1287

preprogramm ed.

The preprogrammed firmware in the XMEGA plays different sounds when the micro

switch buttons are pushed.

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8203D-AVR-04/10

The preprogrammed AT90USB1287 firmware offers features such as a bootloader for

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

3.2 Power suppl y

The kit is powered from USB which leaves two options to power it: Either connects

the kit to a PC through an USB cable, or to a 5V USB power su pply (AC/DC adapter).

3.3 Measuring the XMEGA power consumption

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

power consumption. The R105 resistor (0 Ohm) is the only connection point between

the XMEGA power plane (the V_XM net) and common 3.3V supply of the board (the

V3P3 net). By replacing the R105 shunt resistor with a higher value resistor it is

possible to determine the current consumption of the ATxmega12 8A1.

3.4 Programming the XMEGA through the USB gateway

Programming of the ATxmega128A1 through the USB is not supported in the

preliminary release.

3.5 Communication through UART-to-USB gateway

The XMEGA’s UARTC0 is connected to a software UART on the AT90USB1287. The

AT90USB1287 UART is communicating at 9600 baud, using one start bit, eight data

bits, one stop bit and no parity.

When the AT90USB1287 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.

If the USB device is not enumerated, e.g. powering the kit from an USB supply

adapter, the AT90USB1287 device’s UART will operate in loop back mode (echo

back everything it receives).

4 Connectors

The Xplain kit has four 10-pin 100mill headers. Two are used for programming the

ATxmega128A1 and AT90USB1287, and two are to access spare analog and digital

pins on the XMEGA (expansion headers).

4.1 Programming headers

The XMEGA can be programmed and debugged by connecting an external

programming/debugging tool to the “JTAG & PDI XMEGA” pin header (J100). The pin

header is having a standard JTAG programmer pinout (refer to online help in AVR

Studio®), and tools like the JTAGICE mkII or the AVR ONE! can thus be connected

directly to the header. If it is desired to use PDI programming/debugging an adapter

must be used.

4 AVR1907 8203D-AVR-04/10

Table 4-1. XMEGA programming and debug ging interface – JTAG and PDI.

J100 pin JTAG(1) PDI(2)

J100-1 TCK -

J100-2 GND GND(3)

J100-3 TDO -

J100-4 VCC VCC(3)

J100-5 TMS -

J100-6 nSRST CLK

J100-7 VCC VCC(3)

J100-8 - DATA

J100-9 TDI -

J100-10 GND GND(3)

Notes: 1. Standard pin-out for JTAGICE mkII and other Atmel programming tools.

2. Requires adapter to connect a JTAGICE mkII (refer to AVR Studio help).

3. It is only required to connect on VCC/GND pin.

The AT90USB1287 can be programmed through its bootloader. The bootloader is

evoked by shorting the (PORTF4) pin to GND before applying power to the board.

This can be done by shorting pin 1 and 2 on the “JTA G USB” pin header (J200) with a

jumper. Programming is performed through the “FLIP” plug-in in AVR Studio (can be

started as a stand-alone a pplication also).

FLIP (FLexible In-system Programmer) is a free Atmel’s proprietary software that runs

Windows® 9x/Me/NT/2000/XP and Linux x86. FLIP supports in-system programming

of Flash devices throu gh RS232, USB or CAN.

Alternatively, the AT90USB1287 can be also programmed by connecting a

programming tool, such as a JTAGICE mkII, to the “JTAG USB” pin header (J200).

Note that it is not recommended to program the AT90USB1287 using a

programming tool as this will erase the bootloader.

4.2 IO expansion headers

The XMEGA’s analog PORTA is available on the “XMEGA PORT A” pin header

(J101). This allows the user to connect external signals to the ADC, DAC and Analog

Comparators on PORTA.

The XMEGA’s digital PORTD is available on the “XMEGA PORT D” pin header

(J102). This port features general purpose IO and various communication modules

(USART, SPI and TWI).

Note that the communication modules on PORTD can be interconnected to test out

various functions and features: The USART can loop back communication with a

jumper, or communicate between the two UARTs on the PORT. The native SPI and

the USART in SPI master mode can be connected, and the TWI module can be

enabled in both master and slave mode at the same time to get loop back behavior

(pull-up resist ors required).

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8203D-AVR-04/10

5 Attached Memories

The Xplain kit demonstrates how to use the External Bus Interface (EBI) module to

interface a 4-bit SDRAM. An 8MB SDRAM (16M x 4) is attached in 3-port EBI mode

(PORTH, PORTK and PORTJ).

An 8MB serial Dataflash® is connected to the UARTC1 which can operate in SPI

master mode to interface the dataflash.

6 Miscellaneous IO

6.1 Micro switch buttons

Eight micro switch buttons are connected to the XMEGA’s PORTF. Internal pull-ups

should be enabled to detect when the buttons are pushe d as they sho rt the resp ective

line to GND.

6.2 LEDs

Eight LEDs are connected to the XMEGA’s PORTE. The LEDs are active low – and

thus lights up when the respective lines are d ra wn lo w by the XMEGA.

6.3 Analog IO

An NTC and an adjustable resistor divider (potentiometer) are connected to PORTB

on PINB0 and PINB1 respectively. These analog references can be used as input to

the ADC.

An audio amplifier (and mono speaker) is connected to PORTB on PINB2. This pin is

connected to the XMEGA’s DAC and thus offers a way to generate sound.

7 Available code examples and drivers

A Getting-Started training for the Xplain kit can be downloaded from the Atmel web

site. This training is a general introduction to XMEGA peripherals.

Further information and drivers for XMEGA can be downloaded as application notes,

also distributed from Atmel’s web site.

6 AVR1907 8203D-AVR-04/10

8 Revision history

Different revisions of the Xplain kit is released, these revisions are not fully identical it

can therefore be relevant to identify the board used.

8.1 Revision 1

Revision 1 of the Xplain kit can be identified by not having a bar-code sticker on the

back side.

Table 8-1. Xplain revision 1 – known issu es.

Issue Cause Solution

Speaker is noisy during programming and

debugging of the AT xmega128A1 when

using JTAG.

Problem due to cross-talk contaminating

the audio amplifier input. Use the PDI interface or remove resistor

R305.

AT90USB1287 cannot connect to FLIP

programming software to reprogram the

AT90USB1287 application section of the

flash.

No bootloader programmed in the

AT90USB1287 Upgrade to the AT90USB1287 with the

latest firmware using an external

programming tool such as the JTAG ICE

mkII.

8.2 Revision 2

Revision 2 of the Xplain kit can be identified by a bar-code sticker on the back side

with the following product ID: A09-0560/2.

Table 8-2. Difference between Xplain re vision 1 and revision 2.

Difference Comment

Dataflash changed to

45DB642D-CNU The 45DB642D-CNU is replacing the 45DB041D-SU.

AT90USB1287 bootloader Bootloader is entered by shorting pin 1 and 2 on the J200.

R305 removed To eliminate noise on speaker during JTAG programming

and debugging of the ATxmega128A1.

Two jumpers added –

default placed on the J101

and J102. For convenience of the end-us er.

8.3 Revision 3

Revision 3 of the Xplain kit can be identified by a bar-code sticker on the back side

with the following product ID: A09-0560/3.

Table 8-3. Difference between Xplain re vision 2 and revision 3.

Difference Comment

Series resistors on SDRAM

lines removed Not required – and therefore r emove d.

Shunt resistor (R105) added This is a zero ohm resistor that enables meas urement of the

ATxmega128A1 current consumption.

Audio amplifier is default off

(R300 is pulling do wn the

SD line of the U300).

Reduce power consumption and reduce faint noise from

speaker.

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8203D-AVR-04/10

8.4 Revision 4

Revision 4 of the Xplain kit can be identified by a bar-code sticker on the back side

with the following product ID: A09-0560/4.

Table 8-4. Difference between Xplain re vision 3 and revision 4.

Difference Comment

Replaced resistor R400 with

a 0 ohm resistor. Reduce the noise on the power line but disable the Xplain

board current measurement.

8203D-AVR-04/10

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