Microchip Technology 的 ATmega256RFR2 Xplained Pro User Guide 规格书

AtmeE
Atmel AVR 8-bit Microcontroller
ATmega256RFR2 Xplained Pro
USER GUIDE
Introduction
The Atmel® ATMEGA256RFR2 Xplained Pro evaluation kit is a hardware
platform to evaluate the ATmega256RFR2 microcontroller.
Supported by the Atmel Studio integrated development platform, the kit
provides easy access to the features of the Atmel ATmega256RFR2 and
explains how to integrate the device in a customer design.
The Xplained Pro MCU series evaluation kits include an on-board
Embedded Debugger, and no external tools are necessary to program or
debug the ATmega256RFR2.
The Xplained Pro extension series evaluation kits offers additional
peripherals to extend the features of the board and ease the development of
customer designs.
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Table of Contents
Introduction......................................................................................................................1
1. Introduction................................................................................................................4
1.1. Features....................................................................................................................................... 4
1.2. Kit Overview................................................................................................................................. 4
2. Getting Started...........................................................................................................6
2.1. Xplained Pro Quick Start.............................................................................................................. 6
2.2. Design Documentation and Relevant Links................................................................................. 6
3. Xplained Pro.............................................................................................................. 7
3.1. Embedded Debugger................................................................................................................... 7
3.2. Hardware Identification System....................................................................................................8
3.3. Power Sources............................................................................................................................. 8
3.4. Xplained Pro Headers and Connectors........................................................................................9
3.4.1. Xplained Pro Standard Extension Header..................................................................... 9
3.4.2. Xplained Pro Power Header........................................................................................ 10
4. Hardware User Guide.............................................................................................. 11
4.1. Connectors................................................................................................................................. 11
4.1.1. Xplained Pro Standard Extension Headers..................................................................11
4.1.2. Other Headers............................................................................................................. 15
4.1.3. Current Measurement Header..................................................................................... 16
4.2. Peripherals................................................................................................................................. 16
4.2.1. Crystals........................................................................................................................16
4.2.2. Mechanical Buttons..................................................................................................... 17
4.2.3. LED..............................................................................................................................17
4.2.4. RF................................................................................................................................ 17
4.2.5. Temperature Sensor.................................................................................................... 17
4.3. Embedded Debugger Implementation........................................................................................18
4.3.1. JTAG............................................................................................................................ 18
4.3.2. Virtual COM port.......................................................................................................... 19
4.3.3. Atmel Data Gateway Interface.....................................................................................19
4.4. Factory Programmed Data......................................................................................................... 20
5. Persistent Memory...................................................................................................21
6. Agency Certification.................................................................................................22
6.1. UNITED STATES (FCC).............................................................................................................22
6.2. European Union (ETSI).............................................................................................................. 22
6.3. List of Antennas Tested with this Product:..................................................................................23
7. Appendix..................................................................................................................24
7.1. Getting Started with IAR.............................................................................................................24
8. Hardware Revision History and Known Issues........................................................26
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8.1. Identifying Product ID and Revision........................................................................................... 26
8.2. Revision 3...................................................................................................................................26
9. Document Revision History..................................................................................... 27
10. Evaluation Board/kit Important Notice..................................................................... 28
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1. Introduction
1.1. Features
•Atmel® ATmega256RFR2 microcontroller
•Embedded Debugger (EDBG)
–USB interface
–Programming and debugging (target) through JTAG
–Virtual COM-port interface to target via UART
–Atmel Data Gateway Interface (DGI) to target via SPI or TWI
–Four GPIOs connected to target for code instrumentation
•Digital I/O
–Two mechanical buttons (user and reset button)
–One user LED
–Five extension headers
•Antenna
–One ceramic chip antenna (2450BM15A0015E)
–One SMA connector for external antenna
•Temperature sensor and EEPROM (AT30TSE758)
•Two possible power sources
•External power
•Embedded debugger USB
•16MHz crystal
•32kHz crystal
1.2. Kit Overview
The Atmel ATMEGA256RFR2 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel
ATmega256RFR2.
The kit offers a set of features that enables the ATmega256RFR2 user to get started using the
ATmega256RFR2 peripherals right away and to get an understanding of how to integrate the device in
their own design.
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Figure 1-1. ATMEGA256RFR2 Xplained Pro Evaluation Kit Overview
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2. Getting Started
2.1. Xplained Pro Quick Start
Three steps to start exploring the Atmel Xplained Pro platform:
1. Download Atmel Studio.
2. Launch Atmel Studio.
3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the DEBUG USB
port on the kit.
When the Xplained Pro MCU kit is connected to your computer for the first time, the operating system will
perform a driver software installation. The driver file supports both 32- and 64-bit versions of Microsoft®
Windows® XP, Windows Vista®, Windows 7, and Windows 8.
Once the Xplained Pro MCU board is powered the green power LED will be lit and Atmel Studio will auto
detect which Xplained Pro MCU- and extension board(s) are connected. Atmel Studio will present
relevant information like datasheets and kit documentation. The kit landing page in Atmel Studio also has
the option to launch Atmel Software Framework (ASF) example applications for the kit. The
ATmega256RFR2 device is programmed and debugged by the on-board Embedded Debugger and
therefore no external programmer or debugger tool is needed.
2.2. Design Documentation and Relevant Links
The following list contains links to the most relevant documents and software for the ATMEGA256RFR2
Xplained Pro.
•Xplained Pro products - Atmel Xplained Pro is a series of small-sized and easy-to-use evaluation
kits for Atmel microcontrollers and other Atmel products. It consists of a series of low-cost MCU
boards for evaluation and demonstration of features and capabilities of different MCU families.
•Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
•Atmel sample store - Atmel sample store where you can order samples of devices.
•EDBG User Guide - User guide containing more information about the on-board Embedded
Debugger.
•IAR Embedded Workbench® for Atmel AVR® - This is a commercial C/C++ compiler that is
available for 8-bit AVR. There is a 30 day evaluation version as well as a 4KB code size limited
kick-start version available from their website.
•Atmel Data Visualizer - Atmel Data Visualizer is a program used for processing and visualizing
data. Data Visualizer can receive data from various sources such as the Embedded Debugger Data
Gateway Interface found on Xplained Pro boards and COM ports.
•Design Documentation - Package containing CAD source, schematics, BOM, assembly drawings,
3D plots, layer plots etc.
•Hardware Users Guide in PDF format - PDF version of this User Guide.
•ATMEGA256RFR2 Xplained Pro on Atmel website - Atmel website link.
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3. Xplained Pro
Xplained Pro is an evaluation platform that provides the full Atmel microcontroller experience. The
platform consists of a series of Microcontroller (MCU) boards and extension boards, which are integrated
with Atmel Studio, have Atmel Software Framework (ASF) drivers and demo code, support data
streaming, and more. Xplained Pro MCU boards support a wide range of Xplained Pro extension boards,
which are connected through a set of standardized headers and connectors. Each extension board has
an identification (ID) chip to uniquely identify which boards are connected to an Xplained Pro MCU board.
This information is used to present relevant user guides, application notes, datasheets, and example
code through Atmel Studio.
3.1. Embedded Debugger
The ATMEGA256RFR2 Xplained Pro contains the Atmel Embedded Debugger (EDBG) for on-board
debugging. The EDBG is a composite USB device of three interfaces; a debugger, Virtual COM Port, and
a Data Gateway Interface (DGI).
Together with Atmel Studio, the EDBG debugger interface can program and debug the ATmega256RFR2.
On ATMEGA256RFR2 Xplained Pro, the JTAG interface is connected between the EDBG and the
ATmega256RFR2.
The Virtual COM Port is connected to a UART on the ATmega256RFR2 and provides an easy way to
communicate with the target application through terminal software. It offers variable baud rate, parity, and
stop bit settings. Note that the settings on the ATmega256RFR2 must match the settings given in the
terminal software.
Info:  If not set automatically, data terminal ready (DTR) must be set in the terminal software.
The DGI consists of several physical interfaces for communication with the host computer.
Communication over the interfaces is bidirectional. It can be used to send events and values from the
ATmega256RFR2 or as a generic printf-style data channel. Traffic over the interfaces can be
timestamped on the EDBG for more accurate tracing of events. Note that timestamping imposes an
overhead that reduces maximal throughput. Atmel Data Visualizer is used to send and receive data
through DGI.
The EDBG controls two LEDs on ATMEGA256RFR2 Xplained Pro; a power LED and a status LED. The
table below shows how the LEDs are controlled in different operation modes.
Table 3-1. EDBG LED Control
Operation mode Power LED Status LED
Normal operation Power LED is lit when power is
applied to the board.
Activity indicator, LED flashes
when any communication
happens to the EDBG.
Bootloader mode (idle) The power LED and the status LED blinks simultaneously.
Bootloader mode (firmware
upgrade)
The power LED and the status LED blinks in an alternating pattern.
For further documentation on the EDBG, see the EDBG User Guide.
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3.2. Hardware Identification System
All Xplained Pro compatible extension boards have an Atmel ATSHA204 CryptoAuthentication™ chip
mounted. This chip contains information that identifies the extension with its name and some extra data.
When an Xplained Pro extension is connected to an Xplained Pro MCU board the information is read and
sent to Atmel Studio. The Atmel Kits extension, installed with Atmel Studio, will give relevant information,
code examples, and links to relevant documents. The table below shows the data fields stored in the ID
chip with example content.
Table 3-2. Xplained Pro ID Chip Content
Data field Data type Example content
Manufacturer ASCII string Atmel'\0'
Product Name ASCII string Segment LCD1 Xplained Pro'\0'
Product Revision ASCII string 02'\0'
Product Serial Number ASCII string 1774020200000010’\0’
Minimum Voltage [mV] uint16_t 3000
Maximum Voltage [mV] uint16_t 3600
Maximum Current [mA] uint16_t 30
3.3. Power Sources
The ATMEGA256RFR2 Xplained Pro kit can be powered by several power sources as listed in the table
below.
Table 3-3. Power Sources for ATMEGA256RFR2 Xplained Pro
Power input Voltage requirements Current requirements Connector marking
External power 5V ±2% (±100mV) for
USB host operation.
4.3V to 5.5V if USB host
operation is not
required.
Recommended
minimum is 1A to be
able to provide enough
current for connected
USB devices and the
board itself.
Recommended
maximum is 2A due to
the input protection
maximum current
specification.
PWR
Embedded debugger
USB
4.4V to 5.25V (according
to USB spec.)
500mA (according to
USB spec.)
DEBUG USB
The kit will automatically detect which power sources are available and choose which one to use
according to the following priority:
1. External power.
2. Embedded Debugger USB.
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Info:  External power is required when 500mA from a USB connector is not enough to power
the board with possible extension boards.
3.4. Xplained Pro Headers and Connectors
3.4.1. Xplained Pro Standard Extension Header
All Xplained Pro kits have one or more dual row, 20-pin, 100mil extension header. Xplained Pro MCU
boards have male headers, while Xplained Pro extensions have their female counterparts. Note that all
pins are not always connected. All connected pins follow the defined pin-out description in the table
below.
The extension headers can be used to connect a variety of Xplained Pro extensions to Xplained Pro MCU
boards or to access the pins of the target MCU on Xplained Pro MCU boards directly.
Table 3-4. Xplained Pro Standard Extension Header
Pin number Name Description
1 ID Communication line to the ID chip on an extension board
2 GND Ground
3 ADC(+) Analog to digital converter, alternatively positive part of differential
ADC
4 ADC(-) Analog to digital converter, alternatively negative part of differential
ADC
5 GPIO1 General purpose I/O
6 GPIO2 General purpose I/O
7 PWM(+) Pulse width modulation, alternatively positive part of differential
PWM
8 PWM(-) Pulse width modulation, alternatively negative part of differential
PWM
9 IRQ/GPIO Interrupt request line and/or general purpose I/O
10 SPI_SS_B/
GPIO
Slave select for SPI and/or general purpose I/O
11 I2C_SDA Data line for I2C interface. Always implemented, bus type.
12 I2C_SCL Clock line for I2C interface. Always implemented, bus type.
13 UART_RX Receiver line of target device UART
14 UART_TX Transmitter line of target device UART
15 SPI_SS_A Slave select for SPI. Should preferably be unique.
16 SPI_MOSI Master out slave in line of serial peripheral interface. Always
implemented, bus type.
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Pin number Name Description
17 SPI_MISO Master in slave out line of serial peripheral interface. Always
implemented, bus type.
18 SPI_SCK Clock for serial peripheral interface. Always implemented, bus type.
19 GND Ground
20 VCC Power for extension board
3.4.2. Xplained Pro Power Header
The power header can be used to connect external power to the ATMEGA256RFR2 Xplained Pro kit. The
kit will automatically detect and switch to any external power if supplied. The power header can also be
used as supply for external peripherals or extension boards. Care must be taken not to exceed the total
current limitation of the on-board regulator when using the 3.3V pin.
Table 3-5. Xplained Pro Power Header
Pin number Pin name Description
1 VEXT_P5V0 External 5V input
2 GND Ground
3 VCC_P5V0 Unregulated 5V (output, derived from one of the input sources)
4 VCC_P3V3 Regulated 3.3V (output, used as main power supply for the kit)
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4. Hardware User Guide
4.1. Connectors
This chapter describes the implementation of the relevant connectors and headers on ATMEGA256RFR2
Xplained Pro and their connection to the ATmega256RFR2. The tables of connections in this chapter also
describes which signals are shared between the headers and on-board functionality.
4.1.1. Xplained Pro Standard Extension Headers
The ATMEGA256RFR2 Xplained Pro headers EXT1, EXT2, EXT3, EXT4, and EXT5 offers access to the
I/O of the microcontroller in order to expand the board e.g. by connecting extension modules to the board.
These headers all comply with the standard extension header specified in Table 3-4 Xplained Pro
Standard Extension Header on page 9. All headers have a pitch of 2.54mm.
Table 4-1. Extension Header EXT1
Pin on EXT1 ATmega256RFR2 pin Function Shared functionality
1 Communication line to ID chip
on extension board
2 GND
3 PF0 ADC0
4 PF1 ADC1
5 PE2 GPIO
6 PE3 GPIO
7 PB5 OC1A EXT4 header
8 PB6 OC1B
9 PE5 GPIO / INT5 EXT4 header
10 PD5 GPIO / SPI chip select B EXT4 header
11 PD1 TWI SDA All EXT headers
12 PD0 TWI SCL All EXT headers
13 PE0 UART0 RXD All EXT headers. EXT2, EXT3
and EXT5 connected through
cut-strap.
14 PE1 UART0 TXD All EXT headers. EXT2, EXT3
and EXT5 connected through
cut-strap.
15 PG0 GPIO / SPI chip select A EXT4 header
16 PB2 SPI MOSI All EXT headers
17 PB3 SPI MISO All EXT headers
18 PB1 SPI SCK All EXT headers
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Pin on EXT1 ATmega256RFR2 pin Function Shared functionality
19 GND
20 VCC
Table 4-2. Extension Header EXT2
Pin on EXT2 ATmega256RFR2 pin Function Shared functionality
1 Communication line to ID chip
on extension board
2 GND
3
4
5
6
7
8
9 PE6 GPIO / INT6 EXT5 header
10 PD6 GPIO / SPI chip select B EXT5 header
11 PD1 TWI SDA All other EXT headers
12 PD0 TWI SCL All other EXT headers
13 PE0(1) UART0 RXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
14 PE1(1) UART0 TXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
15 PD4 GPIO / SPI chip select A EXT5 header
16 PB2 SPI MOSI All other EXT headers
17 PB3 SPI MISO All other EXT headers
18 PB1 SPI SCK All other EXT headers
19 GND
20 VCC
Note: 
1. Connected through cut-strap.
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Table 4-3. Extension Header EXT3
Pin on EXT3 ATmega256RFR2 pin Function Shared functionality
1 Communication line to ID chip
on extension board
2 GND
3 PF3 GPIO
4 PG5 GPIO
5 PB7 GPIO
6
7
8
9 PE7 GPIO / INT7
10 PD7 GPIO / SPI chip select B
11 PD1 TWI SDA All other EXT headers
12 PD0 TWI SCL All other EXT headers
13 PE0(1) UART0 RXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
14 PE1(1) UART0 TXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
15 PG2 GPIO / SPI chip select A
16 PB2 SPI MOSI All other EXT headers
17 PB3 SPI MISO All other EXT headers
18 PB1 SPI SCK All other EXT headers
19 GND
20 VCC
Note: 
1. Connected through cut-strap.
Table 4-4. Extension Header EXT4
Pin on EXT4 ATmega256RFR2 pin Function Shared functionality
1 Communication line to ID chip
on extension board
2 GND
3
4
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Pin on EXT4 ATmega256RFR2 pin Function Shared functionality
5
6
7 PB5 OC1A EXT1 header
8
9 PE5 GPIO / INT5 EXT1 header
10 PG0 GPIO / SPI chip select B EXT1 header
11 PD1 TWI SDA All other EXT headers
12 PD0 TWI SCL All other EXT headers
13 PE0 UART0 RXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
14 PE1 UART0 TXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
15 PD5 GPIO / SPI chip select A EXT1 header
16 PB2 SPI MOSI All other EXT headers
17 PB3 SPI MISO All other EXT headers
18 PB1 SPI SCK All other EXT headers
19 GND
20 VCC
Table 4-5. Extension Header EXT5
Pin on EXT5 ATmega256RFR2 pin Function Shared functionality
1 Communication line to ID chip
on extension board
2 GND
3
4
5
6
7
8
9 PE6 GPIO / INT6 EXT2 header
10 PD4 GPIO / SPI chip select B EXT2 header
11 PD1 TWI SDA All other EXT headers
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Pin on EXT5 ATmega256RFR2 pin Function Shared functionality
12 PD0 TWI SCL All other EXT headers
13 PE0(1) UART0 RXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
14 PE1(1) UART0 TXD All other EXT headers. EXT2,
EXT3 and EXT5 connected
through cut-strap.
15 PD6 GPIO / SPI chip select A EXT2 header
16 PB2 SPI MOSI All other EXT headers
17 PB3 SPI MISO All other EXT headers
18 PB1 SPI SCK All other EXT headers
19 GND
20 VCC
Note: 
1. Connected through cut-strap.
4.1.2. Other Headers
In addition to the Xplained Pro Standard Extension Headers on page 11, ATmega256RFR2 Xplained Pro
has additionally two headers with spare signals which offers access to the I/O of the microcontroller which
are otherwise not easily available elsewhere or might be favorable to have collected together. All headers
have a pitch of 2.54mm.
Table 4-6. SPARE ADC Signals Header
Pin on header ATmega256RFR2
pin
Function Shared functionality
1 - VCC (3.3V)
2 PF4 ADC4(1) JTAG Interface, TCK
3 PF5 ADC5(1) JTAG Interface, TMS
4 PF6 ADC6(1) JTAG Interface, TDO
5 PF7 ADC7(1) JTAG Interface, TDI
Note: 
1. These lines are connected to the JTAG interface, and ADC will not work properly while debugging
or programming the kit.
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Table 4-7. SPARE Signals Header 2
Pin on header ATmega256RFR2
pin
Function Shared functionality
1 AREF Analog reference
2 TST Test pin for RF test
mode
3 RSTN Reset EDBG and RESET button
4 RSTON Reset status
5 CLKI Alternative main
clock input
6 GND
4.1.3. Current Measurement Header
An angled 1x2, 100mil pin-header marked with MCU current measurement is located at the upper edge of
the ATMEGA256RFR2 Xplained Pro. All power to the ATmega256RFR2 is routed through this header. To
measure the power consumption of the device remove the jumper and replace it with an ammeter.
Caution:  Removing the jumper from the pin-header while the kit is powered may cause the
ATmega256RFR2 to be powered through its I/O pins. This may cause permanent damage to
the device.
4.2. Peripherals
4.2.1. Crystals
The ATMEGA256RFR2 Xplained Pro kit contains two crystals that can be used as clock sources for the
ATmega256RFR2 device. Each crystal has a cut-strap next to it that can be used to measure the
oscillator allowance. This is done by cutting the strap and adding a resistor across the strap. More
information about oscillator allowance and safety factor can be found in appnote AVR4100.
Table 4-8. External 32.768kHz Crystals
Pin on ATmega256RFR2 Function
PG3 TOSC2, crystal output
PG4 TOSC1, crystal input
Table 4-9. External 16MHz Crystals
Pin on ATmega256RFR2 Function
XTAL1 Crystal input
XTAL2 Crystal output
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4.2.2. Mechanical Buttons
ATmega256RFR2 Xplained Pro contains two mechanical buttons. One button is the RESET button
connected to the ATmega256RFR2 reset line and the other is a generic user configurable button. When a
button is pressed it will drive the I/O line to GND.
Table 4-10. Mechanical Buttons
Pin on ATmega256RFR2 Silkscreen text
RSTN RESET
PE4 SW0
4.2.3. LED
There is one yellow LED available on the ATmega256RFR2 Xplained Pro board that can be turned on
and off. The LED can be activated by driving the connected I/O line to GND.
Table 4-11. LED Connections
Pin on ATmega256RFR2 LED
PB4 Yellow LED
4.2.4. RF
The main feature of ATmega256RFR2 Xplained Pro is to show the RF capability of the ATmega256RFR2
device. This device has bidirectional differential antenna pins, which are fed through a balun (Johanson
Technology, 2450BM15A0015) to create a single unbalanced output/input. This kit has a passive analog
RF switch (Skyworks Solutions Inc, AS222-92LF) connected to the unbalanced output of the balun. The
switch is driven by the DIG1 and DIG2 pins of the ATmega256RFR2, which feature Antenna Diversity to
enable the device to automatically select the best signal from two antennas (can also be selected
manually). The output of the switch is connected to a ceramic chip antenna (Johanson Technology,
2540AT18D0100) and a SMA connector for external antennas.
Table 4-12. RF Connections
Pin on ATmega256RFR2
RFP RF balanced output (Positive)
RFN RF balanced output (Negative)
4.2.5. Temperature Sensor
ATmega256RFR2 Xplained Pro features an Atmel AT30TSE758 temperature sensor chip with an 8kbit
serial EEPROM inside. The sensor includes programmable high and low temperature alarms, user-
selectable temperature resolution up to 12 bits, and an I2C/SMBus™ compatible serial interface.
Table 4-13. Temperature Sensor Connections
AT30TSE758
temperature
sensor pin
Pin name Pin on
ATmega256RF
R2
Comment
1 SDA PD1 Data line of serial interface
2 SCL PD0 Clock line of serial interface
3 ALERT NC(1) Temperature alarm signaling pin
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AT30TSE758
temperature
sensor pin
Pin name Pin on
ATmega256RF
R2
Comment
4 GND GND
5 A2 - Address line for serial interface, by default pulled
low
6 A1 - Address line for serial interface, by default pulled
high
7 A0 - Address line for serial interface, by default pulled
high
8 VCC VCC
Note: 
1. Alert pin is available on a test point hole close to the sensor.
The temperature sensor has two TWI addresses, one for the temperature sensor and one for the
EEPROM. The addresses are "0b1001 A2 A1 A0" for the temperature sensor and "0b1010 A2 A1 A0" for
the EEPROM. The address selection lines (A2, A1 and A0) of the temperature sensor chip is by default
pulled high for A0 and A1, and low for A2, through 100kΩ resistors, which makes the default addresses
0b1001011 and 0b1010011. Soldering the straps on the front of the ATmega256RFR2 Xplained Pro board
for An will alter that bit in the address to low or high. Each strap is marked in silkscreen with A0, A1, and
A2 as shown in Figure 4-1 Temperature Sensor TWI Address on page 18. When communicating with
the EEPROM, part of the TWI address is used as a page address, for more details see the device
datasheet.
Figure 4-1. Temperature Sensor TWI Address
4.3. Embedded Debugger Implementation
The ATmega256RFR2 Xplained Pro contains an Embedded Debugger (EDBG) that can be used to
program and debug the ATmega256RFR2 using JTAG. The Embedded Debugger also include a Virtual
Com port interface over UART, an Atmel Data Gateway Interface over SPI, and TWI and it monitors four
of the ATmega256RFR2 GPIOs. Atmel Studio can be used as a front end for the Embedded Debugger.
4.3.1. JTAG
The JTAG use five pins to communicate with the target. For further information on how to use the
programming and debugging capabilities of the EDBG, see Embedded Debugger on page 7.
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Table 4-14. JTAG Connections
Pin on ATmega256RFR2 Function
PF4 JTAG TCK
PF5 JTAG TMS
PF6 JTAG TDO
PF7 JTAG TDI
RSTN RESET
4.3.2. Virtual COM port
The Embedded Debugger act as a Virtual Com Port gateway by using one of the ATmega256RFR2
UARTs. For further information on how to use the Virtual COM port, see Embedded Debugger on page 7.
Table 4-15. Virtual COM Port Connections
Pin on ATmega256RFR2 Function
PD2 UART RXD (ATmega256RFR2 RX line)
PD3 UART TXD (ATmega256RFR2 TX line)
4.3.3. Atmel Data Gateway Interface
The Embedded Debugger features an Atmel Data Gateway Interface (DGI) by using either an SPI or TWI
port. The DGI can be used to send a variety of data from the ATmega256RFR2 to the host PC. For
further information on how to use the DGI interface, see Embedded Debugger on page 7.
Table 4-16. DGI Interface Connections When Using SPI
Pin on ATmega256RFR2 Function
PB0 Slave select (ATmega256RFR2 is Master)
PB1 SPI SCK (Clock Out)
PB2 SPI MOSI (Master Out, Slave in)
PB3 SPI MISO (Master In, Slave Out)
Table 4-17. DGI Interface Connections When Using TWI
Pin on ATmega256RFR2 Function
PD0 SCL (Clock line)
PD1 SDA (Data line)
Four GPIO lines are connected to the Embedded Debugger. The EDBG can monitor these lines and time
stamp pin value changes. This makes it possible to accurately time stamp events in the
ATmega256RFR2 application code. For further information on how to configure and use the GPIO
monitoring features, see Embedded Debugger on page 7.
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Table 4-18. GPIO Lines Connected To the EDBG
Pin on ATmega256RFR2 Function
PE2 GPIO0
PE3 GPIO1
PE5 GPIO2
PE6 GPIO3
4.4. Factory Programmed Data
ATmega256RFR2 Xplained Pro has preprogrammed data in the ATmega256RFR2's user signature data
page 1 with address 0x0100. User signature data is isolated from the main flash and will not be cleared
by a chip erase command. Special commands are available to read, write and erase the user signature
data pages through a JTAG interface and from firmware. Refer to the ATmega256RFR2's datasheet for
details on how to read the user signature data pages.
The preprogrammed data in the user signature data page 1 is documented in Persistent Memory on page
21, ATmega256RFR2 Xplained Pro does not feature an XTAL calibration value.
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5. Persistent Memory
A persistent memory space is allocated to store product specific information. The persistent memory is
organized as follows:
Table 5-1. Persistent Memory
Data Data Type Size
Structure Revision uint 16 2 bytes
MAC address uint 64 8 bytes
Board information – PCBA Name ASCII string(1) 30 bytes
Board information – PCBA Serial number ASCII string(1) 10 bytes
Board information – PCBA Atmel Part Number ASCII string(1) 8 bytes
Board information – PCBA Revision uint 8 1 byte
Reserved 3 bytes
XTAL Calibration Value uint 8 1 byte
Reserved 7 bytes
Reserved 4 bytes
CRC uint 16 2 bytes
Note: 
1. '\0' terminated ASCII string.
The MAC address stored inside the MCU is a uniquely assigned ID for each kit and is owned by Atmel.
User applications can use this unique MAC ID to address the kit.
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6. Agency Certification
6.1. UNITED STATES (FCC)
This equipment complies with Part 15 of the FCC rules and regulations. To fulfill FCC Certification
requirements, an OEM manufacturer must comply with the following regulations:
1. This equipment (ATMEGA256RFR2 Xplained Pro) is for use for evaluation purposes only and must
not be incorporated into any other device or system.
Important: 
This equipment complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions: (1) this device may not cause harmful interference, and (2) this device must
accept any interference received, including interference that may cause undesired operation
(FCC 15.19).
The internal / external antenna(s) used for this mobile transmitter must provide a separation distance of at
least 20 cm from all persons and must not be colocated or operating in conjunction with any other
antenna or transmitter.
Installers must be provided with antenna installation instructions and transmitter operating conditions for
satisfying RF exposure compliance. This device is approved as a mobile device with respect to RF
exposure compliance, and may only be marketed to OEM installers. Use in portable exposure conditions
(FCC 2.1093) requires separate equipment authorization.
Important: 
Modifications not expressly approved by this company could void the user's authority to operate
this equipment (FCC section 15.21).
Important: 
This equipment has been tested and found to comply with the limits for a Class A digital device,
pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable
protection against harmful interference when the equipment is operated in a commercial
environment. This equipment generates, uses, and can radiate radio frequency energy and, if
not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely
to cause harmful interference in which case the user will be required to correct the interference
at his own expense (FCC section 15.105).
6.2. European Union (ETSI)
The ATMEGA256RFR2 Xplained Pro Evaluation kits has been certified for use in European Union
countries. A Declaration of Conformity must be issued for each of these standards and kept on file as
described in Annex II of the R&TTE Directive.
Furthermore, the manufacturer must maintain a copy of the modules' documentation and ensure the final
product does not exceed the specified power ratings, antenna specifications, and/or installation
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requirements as specified in the user manual. If any of these specifications are exceeded in the final
product, a submission must be made to a notified body for compliance testing to all required standards.
Important: 
The 'CE' marking must be affixed to a visible location on the OEM product. The CE mark shall
consist of the initials "CE" taking the following form:
•The CE marking must have a height of at least 5mm except where this is not possible on
account of the nature of the apparatus.
•The CE marking must be affixed visibly, legibly, and indelibly.
More detailed information about CE marking requirements you can find at "DIRECTIVE
1999/5/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL" on 9 March 1999 at
section 12.
6.3. List of Antennas Tested with this Product:
Table 6-1. List of Tested Antennas
Antenna number Make Model/Part # Antenna gain (dBi) Type of antenna
Antenna 1 Johanson Technology 2450AT18D0100 1.5dBi Ceramic Antenna
Antenna 2 Techfun Co., Ltd M01-SS2 0dBi External Antenna
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7. Appendix
7.1. Getting Started with IAR
IAR Embedded Workbench® for AVR® is a proprietary high efficiency compiler not based on GCC.
Programming and debugging of Xplained Pro kits are supported in IAR™ Embedded Workbench for AVR
using the Atmel-ICE interface. Some initial settings have to be set up in the project to get the
programming and debugging to work.
The following steps will explain how to get your project ready for programming and debugging:
1. Make sure you have opened the project you want to configure. Open the OPTIONS dialog for the
project.
2. In the category General Options, select the Target tab. Select the device for the project or, if not
listed, the core of the device.
3. In the category Debugger, select the Setup tab. Select Atmel-ICE as the driver.
4. In the category Debugger > Atmel-ICE, select the Atmel-ICE 1 tab. Select JTAG as the interface
and optionally select the JTAG frequency.
Figure 7-1. Select Target Device
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Figure 7-2. Select Debugger
Figure 7-3. Configure Interface
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8. Hardware Revision History and Known Issues
8.1. Identifying Product ID and Revision
The revision and product identifier of Xplained Pro boards can be found in two ways; either through Atmel
Studio or by looking at the sticker on the bottom side of the PCB.
By connecting an Xplained Pro MCU board to a computer with Atmel Studio running, an information
window will pop up. The first six digits of the serial number, which is listed under kit details, contain the
product identifier and revision. Information about connected Xplained Pro extension boards will also
appear in the Atmel Kit's window.
The same information can be found on the sticker on the bottom side of the PCB. Most kits will print the
identifier and revision in plain text as A09-nnnn\rr, where nnnn is the identifier and rr is the revision.
Boards with limited space have a sticker with only a QR-code, which contains a serial number string.
The serial number string has the following format:
"nnnnrrssssssssss"
n = product identifier
r = revision
s = serial number
The product identifier for ATMEGA256RFR2 Xplained Pro is A09-1784.
8.2. Revision 3
Revision 3 of ATMEGA256RFR2 Xplained Pro is the initial released version.
Known issues
•The low and high byte of the 16-bit CRC value of the information in the user page might be
swapped on serial numbers prior to 1885.
Workaround: If it is neccssary to use the CRC value to verify the data in the user page, compare
the calculated value with both the swapped and non-swapped version of the CRC value present in
the user page.
•All kits with a serial number lower than 0200003858 does not have any pre programmed data in the
userpage.
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9. Document Revision History
Doc. rev. Date Comment
42079E 12/2015 Corrected PG4 to PG2 pinout on Table 4-3 Extension Header EXT3 on
page 13. Added Getting Started with IAR on page 24.
42079D 11/2013 Added chapter about persistent memory and factory programmed data.
Added new errata.
42079C 05/2013 Added list of antennas.
42079B 04/2013 Added section about certification.
42079A 02/2013 Initial document release.
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10. Evaluation Board/kit Important Notice
This evaluation board/kit is intended for use for FURTHER ENGINEERING, DEVELOPMENT,
DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is not a finished product and may not
(yet) comply with some or any technical or legal requirements that are applicable to finished products,
including, without limitation, directives regarding electromagnetic compatibility, recycling (WEEE), FCC,
CE or UL (except as may be otherwise noted on the board/kit). Atmel supplied this board/kit "AS IS,"
without any warranties, with all faults, at the buyer's and further users' sole risk. The user assumes all
responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies Atmel
from all claims arising from the handling or use of the goods. Due to the open construction of the
product, it is the user's responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER USER NOR ATMEL
SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of Atmel covering or
relating to any machine, process, or combination in which such Atmel products or services might be or
are used.
Mailing Address: Atmel Corporation
1600 Technology Drive
San Jose, CA 95110
USA
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Atmet ‘Enabllng Unlimited Possnbllltles‘ “um-ID
Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com
© 2015 Atmel Corporation. / Rev.: Atmel-42079E-ATmega256RFR2-Xplained-Pro_User Guide-12/2015
Atmel®, Atmel logo and combinations thereof, Enabling Unlimited Possibilities®, AVR®, and others are registered trademarks or trademarks of Atmel Corporation in
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DISCLAIMER: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to any
intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL TERMS AND
CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS ANY EXPRESS, IMPLIED
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