Atmel SAM R21 Xplained Pro (USER GUIDE)
Contents
1. 7 3 4 Standard Headers and Connectors 7 3 4 1 Xplained Pro Standard Extension Header 7 3 4 2 Xplained Pro Power Header 8 4 Hardware user guide eese 10 4d TEE EU ERES as 10 4 1 1 I O Extension Headers 10 4 1 2 Other Headers and Connectors 11 4 2 Peripherals siii PP Ein LER ERE TARDAR MPa I BOT bu Eel L IER teas 11 2710 MMC 11 4 2 2 Mechanical Buttons ecce ien sians 12 4 2 3 m 12 4224 12 ICE 12 4 3 1 8V Operation Nie 13 4 4 Embedded Debugger Implementation 14 4 4 1 Serial Wire Debug cece IM 15 442 Vitt al COM cerner 15 4 4 3 Atmel Data Gateway Interface 15 Kit Specific Data tons 16 6 Agency Certification i uei oscura Ret et RARE ADR EREqN ERE 17 6 1 United States FCC mee 17 6 2 European Union EWS e aai 17 6 3 Canada IG E EE 18 6 4 Using Limited Modular Certified Products2. 18 6 5 List of Antennas Tested With This 19 7 Hardware Revision History and Known Issues 20 7 1 Identifying Product ID and Revision 20 7 25 m 20 8 Document revision history 21 9 Evaluation Board Kit Important Notice 22 Atmel SAM R21 Xplained Pro USER GUIDE 2 42243A MCU 02 2014 1 1 1 2 Atmel Introduction Features Atmel ATSAMR21G18A microcontroller Embedded debugger EDBG e USB interface e Programming and debugging on board SAM R21 through Serial Wire Debug SWD e Virtual COM port interface to target via UART e Atmel Data Gateway Interface DGI to target via SPI and TWI e Four GPIOs connected to target for code instrumentation Digital I O e Two mechanical buttons user and reset button e One user LED e Two extension headers Antenna e ceramic chip antenna 2450AT18D0100 e SMA connector for external antenna Three possible power sources e External power e Embedded debugger USB e Target USB 32kHz crystal 16MHz crystal USB interface device Kit Overview The Atmel SAM R21 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel ATSAMR21G18A The kit offers a set of features that enables the ATSAMR21G18A user to get started using the ATSAMR21G18A peripherals
3. 15 SPI SS A Slave select for SPI Should be unique if possible 16 SPI MOSI Master out slave in line of Serial peripheral interface Always implemented bus type 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 Xplained Pro Power Header The power header can be used to connect external power to the SAM R21 Xplained Pro kit The kit will automatically detect and switch to the 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 for the 3 3V regulated output To locate the current measurement header refer to Figure 1 1 SAM R21 Xplained Pro Evaluation Kit Overview on page 4 Table 3 5 Power Header PWR 1 VEXT P5VO External 5V input 2 GND Ground 3 VCC P5VO Unregulated 5V output derived from one of the input sources Atmel SAM R21 Xplained Pro USER GUIDE 8 42243A MCU 02 2014 Pin number PWR header Pin name Description 4 VCC_P3V3 Regulated 3 3V output used as main power for the kit Note If the board is powered from a battery source it is recommended to use the PWR header If there is a power source connected to EDBG USB the EDBG is activated and it will consume more power Atme
4. 42243A MCU 02 2014 4 3 Technology 2450BM15A0015 to create a single 50 ohm unbalanced output input This kit has a passive analog RF switch Skyworks Solutions Inc S222 92LF connected to the unbalanced output of the balun The switch is driven by the RFCTRL1 and RFCTRL2 pins of the ATSAMR21G18A 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 10 RF Connections Pin on SAM R21 RFP RF balanced output positive REN RF balanced output negative 9 RFCTRL1 RF switch control signal negative PA12 RFCTRL2 RF switch control signal positive 1 8V Operation The SAM R21 Xplained Pro board is operated at 3 3V by default but it also has the possibility of running at lower voltages from an external supply The EDBG is designed to run from a 3 3V supply and won t work on other voltages therefore all connections from the EDBG and the on board 3 3V regulator to the ATSAMR21G18A have to be removed Figure 4 1 1 8V Operation Modifications on page 14 shows all components that have to be removed for 1 8V operation When the components are removed the kit can be supplied with a desired voltage through the pins marked 3V3 pin four and GND pin two on the power
5. USER GUIDE Atmel SAM R21 Xplained Pro Preface The Atmel SAM R21 Xplained Pro evaluation kit is a hardware platform to evaluate the ATSAMR21G18A microcontroller Supported by the Atmel Studio integrated development platform the kit provides easy access to the features of the Atmel ATSAMR21G18A and explains how to integrate the device in a custom 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 ATSAMR21G18A The Xplained Pro extension kits offers additional peripherals to extend the features of the board and ease the development of custom designs 42243A MCU 02 2014 Atmel Table of Contents Preface ASE 1 1 Introd ction etre tee xr e ee a n len ee 3 1 1 Rus RS 3 1 2 Kit OVerVIeW coru poe SERE SERA STR DU SPERM RR EU I Red IE 3 2 Getting started successi pies perdi es Rake 5 2 1 Quickestart MERE ERU 5 2 2 Connecting the suiit pasen 5 2 3 Design Documentation and Related Links 5 3 Xplained Pro eee 6 3 4 Embedded Deb gger sette bett 6 3 2 Hardware Identification System 6 0 9 POWE SUPPI f 3 3 1 Measuring SAM R21 Power Consumption
6. Atmel Atmel SAM R21 Xplained Pro USER GUIDE 17 42243A MCU 02 2014 Important The CE marking must be affixed to a visible location on the OEM product The CE mark shall 6 3 consist of the initials CE taking the following form e 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 e 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 Canada IC This device complies with Industry Canada licence exempt RSS standard s Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation of the device The SAM R21 Xplained Pro is certified as a limited modular transmitter with IC ID 11019A 092127 Le pr sent appareil est conforme aux CNR d Industrie Canada applicables aux appareils radio exempts de licence L exploitation est autoris e aux deux conditions suivantes 1 l appareil ne doit pas produire de brouillage et 2 l utilisateur de l appareil doit accepter tout brouillage radio lectrique subi m me si le brouillage est susceptible d en compromettre le fonctionnement This equipment complies with radio frequency exposure limi
7. The code size limit is 16KB for devices with MO MO and M1 cores and 32KB for devices with other cores 7 Atmel sample store Atmel sample store where you can order samples of devices l http www atmel com atmelstudio 2 http www atmel com atmelstudio 2 http www atmel com XplainedPro li http www atmel com Images Atmel 42243 SAMR21 Xplained Pro_User Guide pdf http www atmel com Images Atmel 42243 SAMR21 Xplained Pro_User Guide zip 8 http www atmel com Images Atmel 42096 Microcontrollers Embedded Debugger_User Guide pdf 7 http www atmel com atmelstudio 8 http www iar com en Products IAR Embedded Workbench ARM 2 http www atmel com system samplesstore Atmel Atmel SAM R21 Xplained Pro USER GUIDE 5 42243A MCU 02 2014 3 1 3 2 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 that 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 that are connected through a set of standardized headers and connectors Each extension board has an identification ID chip to uniquely identify which boards are mounted on a Xplained Pro MCU board This information is used to present relevant user guides application notes datasheets a
8. Atmel logo and combinations thereof Enabling Unlimited Possibilities AvR and others are registered trademarks or trademarks of Atmel Corporation or its subsidiaries Windows is a registered trademark of Microsoft Corporation in U S and or other countries ARM and Cortex are registered trademarks of ARM Ltd Other terms and product names may be trademarks of others 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 OR STATUTORY WARRANTY RELATING TO ITS PRODUCTS INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTY OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE OR NON INFRINGEMENT IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT INDIRECT CONSEQUENTIAL PUNITIVE SPECIAL OR INCIDENTAL DAMAGES INCLUDING WITHOUT LIMITATION DAMAGES FOR LOSS AND PROFITS BUSINESS INTERRUPTION OR LOSS OF INFORMATION ARISING OUT OF THE USE OR INABILITY TO USE THIS DOCUMENT EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES Atmel makes no representations or warranties with respect to the accuracy or completeness of the contents of this document and reserves the right to make
9. EXT3 and EDBG 18 SPI SCK PB23 SERCOMS PAD 3 SPI SCK EXT3 and EDBG 19 GND GND 20 VCC VCC Table 4 2 Extension Header EXT3 Pin on EXT3 SAM R21 Function Shared functionality 1 ID Communication line to ID chip on extension board 2 GND GND 3 ADC 4 ADC 5 5 GPIO1 PA15 GPIO 6 GPIO2 7 PWM 8 PWM 9 IRQ GPIO Atmel Atmel SAM R21 Xplained Pro USER GUIDE 10 42243A MCU 02 2014 4 1 2 1 4 1 2 2 4 2 4 2 1 10 SPI_SS_B GPIO PA08 GPIO 11 TWI_SDA PA16 SERCOM1 PAD 0 C SDA EXT1 and EDBG 12 TWI_SCL PA17 SERCOM1 PAD 1 2 SCL EXT1 and EDBG 13 USART RX 14 USART_TX 15 SPI SS A PA14 GPIO 16 SPI MOSI PB22 SERCOM5 PAD 2 SPI MOSI 1 and EDBG 17 SPI MISO PB02 SERCOMS PAD 0 SPI MISO EXT1 and EDBG 18 SPI SCK PB23 SERCOM5 PAD 3 SPI SCK EXT1 and EDBG 19 GND GND 20 VCC VCC Other Headers and Connectors There are two headers that are not mounted on the kit from production These headers contains signals that are otherwise not easily accecible on the kit Altnernate Signals Header The alternate signals header is marked with Alternate in silkscreen of the kit the signals provided here are otherwise hard to do measurements on Table 4 3 Alternate Signals Header 1 9 RFCTRL1 positive antennae switch control signal 2 PA12 RFCTRL2 negative antennae switch control signal 3 PA27 GPIO chip select
10. changes to specifications and products descriptions at any time without notice Atmel does not make any commitment to update the information contained herein Unless specifically provided otherwise Atmel products are not suitable for and shall not be used in automotive applications Atmel products are not intended authorized or warranted for use as components in applications intended to support or sustain life
11. right away and to get an understanding of how to integrate the device in their own design Atmel SAM R21 Xplained Pro USER GUIDE 3 42243A MCU 02 2014 Figure 1 1 SAM R21 Xplained Pro Evaluation Kit Overview CURRENT MEASUREMENT SWO0 USER BUTTON HEADER RESET BUTTON TARGET USB 71 DEBUG USB 8 lt Ha Bic T Eum sve ono lt POWER Dew Alt mel A HEADER i CORTEX J CHIP ANTENNA gt E SAMR21 X PLAINED exc FOR EXTERNAL 16MHz CRYSTAL 3 din DEBUGGER FOR RF 32 768kHz CRYSTAL ANTENNA SWITCH 85 ae amp BALUN lt _ EXTENSION ene HEADER 1 5 4 2 EXTERNAL ANTENNA or CONNECTOR 4233 3H vec 64 o EXTENSION HEADER 3 Atmel Atmel SAM R21 Xplained Pro USER GUIDE 4 42243A MCU 02 2014 2 1 2 2 2 3 Getting started Quick start 3 Steps to start exploring the Atmel Xplained Pro Platform e Download and install Atmel Studio e Launch Atmel Studio e Connect a Micro B cable to the DEBUG USB port Connecting the Kit When connecting Atmel SAM R21 Xplained Pro to your computer for the first time the operating system will do a driver software installation The driver file supports both 32 bit and 64 bit versions of Microsoft Windows XP and Windows 7 Once connected the green power LED will be lit and Atmel Studio will autodetect which Xplained Pro evaluation and extension kit s that s connec
12. 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 6 2 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 European Union ETSI The SAM R21 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 amp 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 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
13. II string Atmel O Product Name ASCII string Segment LCD1 Xplained Pro 0 Product Revision ASCII string 02 0 Product Serial Number ASCII string 1774020200000010 0 http store atmel com ATSAMR21 XPRO http www atmel com Images Atmel 42096 Microcontrollers Embedded Debugger_User Guide pdf Atmel Atmel SAM R21 Xplained Pro USER GUIDE 6 42243A MCU 02 2014 Data Field Data Type Example Content Minimum Voltage mV uint16 t 3000 Maximum Voltage mV uint16 t 3600 Maximum Current mA uint16 t 30 3 3 Power supply The SAM R21 Xplained Pro kit can be powered either by USB or by an external power source through the 4 pin power header marked PWR This connector is described in Xplained Pro Power Header on page 8 The available power sources and specifications are listed in Table 3 3 Power Sources for SAM R21 Xplained Pro on page 7 Table 3 3 Power Sources for SAM R21 Xplained Pro Voltage requirements Current requirements Euer marking External power 5V 2 100mV for Recommended USB host operation minimum is 1A to 4 3V to 5 5V if USB host able to provide operation is not required n ough current for connected USB devices and the board itself Recommended maximum is 2A due to the input protection maximum current specification Embedded debugger 4 4V to 5 25V 500mA according to EDBG USB USB according to USB spec USB spec Target USB 4 4V to 5 25V 500mA according to TARGET USB acc
14. Table 4 13 DGI Interface Connections When Using SPI Pin on SAM R21 Function PA27 GPIO SPI SS Slave select SAM R21 is Master PBO2 SERCOMS PAD 0 SPI MISO Master In Slave Out PB22 SERCOMS PAD 2 SPI MOSI Master Out Slave in PB23 SERCOMS PAD 3 SPI SCK Clock Out Table 4 14 DGI Interface Connections When Using Pin on SAM R21 Function PA16 SERCOM1 C SDA Data line PA17 SERCOM1 PAD 1 PC SCL Clock 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 SAM R21 application code For further information on how to configure and use the GPIO monitoring features see Embedded Debugger on page 6 Table 4 15 GPIO Lines Connected to the EDBG PAO8 GPIOO PA09 GPIO1 PA12 GPIO2 _ 14 GPIO3 Atmel Atmel SAM R21 Xplained Pro USER GUIDE 15 42243A MCU 02 2014 5 Kit Specific Data One of the user pages in the EDBG is programmed with data specific to the SAM R21 Xplained Pro The data can be read through the 2 interface connected to the EDBG for detailed information see the EDBG User Guide data is stored as little endian Table 5 1 MAC64Register Offset 0x00 LINE A MAC64 MAC64 Address hex http www atmel com Images Atmel 42096 Microcontrollers Embedded Debugger_User Guide pdf Atmel Atmel SAM R21 Xplain
15. e ci joint Dans ce cas le produit final doit tre tiquet dans un endroit visible par le texte suivant Contains Transmitter Module IC 11019A 092127 OR Contains IC 11019A 092127 Using Limited Modular Certified Products The SAM R21 Xplained Pro is certified under the modular certification category of Limited Modular transmitter Any final end product created using these modules must undergo the compliance testing of the complete final product that includes these modules and receive new ID assignments for the final product carrying these modules for the respective area it is intended for use Successful certification of the final product lies solely with the type of design of the final product excluding any pre tested module Atmel Atmel SAM R21 Xplained Pro USER GUIDE 18 42243A MCU 02 2014 6 5 List of Antennas Tested With This Product Table 6 1 List of Tested Antennas Antenna Number Model Part Type of Antenna el Antenna 1 Johanson 2450AT18D0100 1 5dBi Ceramic Antenna Technology Antenna 2 Techfun Co Ltd M01 SS2 OdBi External Antenna Atmel Atmel SAM R21 Xplained Pro USER GUIDE 19 42243A MCU 02 2014 f Hardware Revision History and Known Issues 7 1 Identifying Product ID and Revision The revision and product identifier of Xplained Pro boards can be found in two ways through Atmel Studio or by looking at the sticker on the bottom side of the PCB By connecting a Xplained Pro MCU b
16. ed Pro USER GUIDE 16 42243A MCU 02 2014 6 1 Agency Certification 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 SAM R21 Xplained Pro is for use for evaluation purposes only and must not be incorporated into any other device or system The SAM R21 Xplained Pro is certified as a limited modular transmitter with FCC ID VW4A092127 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
17. header described in Xplained Pro Power Header on page 8 To program and debug the ATSAMR21G18A 2x5 50 mil header has to be mounted above EXT 1 as shown in Figure 1 1 SAM R21 Xplained Pro Evaluation Kit Overview on page 4 http www johansontechnology com datasheets balun filter 2450BM15A0015 pdf 3 http www skyworksinc com uploads documents 200252C pdf i http www johansontechnology com images stories ip rf antennas Antenna_2450AT18D0100_v3 pdf Atmel Atmel SAM R21 Xplained Pro USER GUIDE 13 42243A MCU 02 2014 4 4 Operating the SAM R21 Xplained Pro on other voltages than 3 3V requires physical modifications on the kit using a soldering iron and an external debugger for programming the ATSAMR21G18A The on board LED is selected for 3 3V operation the light level at 1 8V opeartion is very low To increase the emitted light level the value of the series resistor can be lowered The EDBG functionality can be restored by re soldering the removed components they are all 0 ohm resistors The voltage supplied through the power header is applied directly to the ATSAMR21G18A and the extension headers applying a voltage greater than 3 3V may damage the board permanently Figure 4 1 1 8V Operation Modifications Removed components EXTENSION HEADER GPIO1 GPIOO gt B sPLSS 08 1903 Rev 2 e CN MN E 5 lt ao Es om E lt Embedded Debugger Implemen
18. l Atmel SAM R21 Xplained Pro USER GUIDE 9 42243A MCU 02 2014 4 1 Hardware user guide Connectors This chapter describes the implementation of the relevant connectors and headers on SAM R21 Xplained Pro and their connection to the ATSAMR21G18A The tables of connections in this chapter also describes which signals are shared between the headers and on board functionality Extension Headers The SAM R21 Xplained Pro headers EXT1 EXT2 and EXT3 offer access to the I O of the microcontroller in order to expand the board e g by connecting extensions to the board These headers all comply with the standard extension header specified in Xplained Pro Standard Extension Header on page 7 All headers have a pitch of 2 54 mm Table 4 1 Extension Header EXT1 Pin on EXT1 SAM R21 pin Function Shared functionality 1 ID Communication line to ID chip on extension board 2 GND GND 3 ADC AIN 6 4 ADC PAO7 AIN 7 5 GPIO1 PA13 GPIO 6 GPIO2 PA28 GPIO 7 PWM PA18 TCCO WO 2 8 PWM PA19 TCCO WO 3 9 IRQ GPIO PA22 EXTINT 6 10 SPI SS B GPIO PA23 GPIO 11 TWI_SDA PA16 SERCOM1 PAD 0 PC SDA EXT3 and EDBG 12 TWI_SCL PA17 SERCOM1 PAD 1 2 SCL EXT3 and EDBG 13 USART RX 5 SERCOMO PAD 1 UART RX EDBG 14 USART_TX PA04 SERCOMO PAD 0 UART TX EDBG 15 SPI SS A PB03 SERCOMS PAD 1 SPI SS 16 SPI MOSI PB22 SERCOMS PAD 2 SPI MOSI EXT3 and EDBG 17 SPI MISO PB02 SERCOMS PAD 0 SPI MISO
19. ll pins are not Atmel SAM R21 Xplained Pro USER GUIDE 7 42243A MCU 02 2014 3 4 2 Atmel always connected However all the connected pins follow the defined pin out described in Table 3 4 Xplained Pro Extension Header on page 8 The extension headers can be used to connect a wide variety of Xplained Pro extensions to Xplained Pro MCU boards and to access the pins of the target MCU on Xplained Pro MCU board directly Table 3 4 Xplained Pro Extension Header Pin number Description 1 ID Communication line to the ID chip on 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 GPIO1 General purpose GPIO2 General purpose PWM Pulse width modulation alternatively positive part of differential PWM 8 PWM Pulse width modulation alternatively positive part of differential PWM 9 IRQ GPIO Interrupt request line and or general purpose 10 SPI SS B GPIO Slave select for SPI and or general purpose 11 TWI SDA Data line for two wire interface Always implemented bus type 12 TWI SCL Clock line for two wire interface Always implemented bus type 13 USART RX Receiver line of Universal Synchronous and Asynchronous serial Receiver and Transmitter 14 USART TX Transmitter line of Universal Synchronous and Asynchronous serial Receiver and Transmitter
20. maximal throughput The DGI uses a proprietary protocol and is thus only compatible with Atmel Studio The EDBG controls two LEDs on SAM R21 Xplained Pro a power LED and a status LED Table 3 1 EDBG LED Control on page 6 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 Activity indicator LED flashes applied to the board every time something happens on the EDBG Bootloader mode idle The power LED and the status LED blinks simultaneously Bootloader mode firmware The power LED and the status LED blinks in an alternating pattern upgrade For further documentation on the EDBG see the EDBG User Guide 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 board 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 Table 3 2 Xplained Pro ID Chip Content on page 6 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 ASC
21. nd example code through Atmel Studio Available Xplained Pro MCU and extension boards can be purchased in the Atmel Web Store Embedded Debugger The SAM R21 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 Data Gateway Interface DGI In conjunction with Atmel Studio the EDBG debugger interface can program and debug the ATSAMR21G18A On the SAM R21 Xplained Pro the SWD interface is connected between the EDBG and the ATSAMR21G18A The Virtual COM Port is connected to a UART port on the ATSAMR21G18A see section Embedded Debugger Implementation on page 14 for pinout and provides an easy way to communicate with the target application through simple terminal software It offers variable baud rate parity and stop bit settings Note that the settings on the target device UART must match the settings given in the terminal software The DGI consists of several physical data interfaces for communication with the host computer See section Embedded Debugger Implementation on page 14 for available interfaces and pinout Communication over the interfaces are bidirectional It can be used to send events and values from the ATSAMR21G18A 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
22. nical 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 Atmel Atmel SAM R21 Xplained Pro USER GUIDE 22 42243A MCU 02 2014 Atmel Enabling Unlimited Possibilities Atmel Corporation 1600 Technology Drive San Jose CA 95110 USA T 1 408 441 0311 F 1 408 436 4200 www atmel com 2014 Atmel Corporation All rights reserved Rev 42243A MCU 02 2014 Atmel
23. oard 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 Kits window The same information can be found on the sticker on the bottom side of the PCB The sticker on SAM R21 Xplained Pro shows the identifier and revision plain text as A09 nnnnVr where nnnn is the identifier and rr is the revision A uniqly assigned MAC64 address in hex FCC ID and IC id are also printed on the sticker A serial number string is embedded in the matrix barcode The serial number string has the following format nnnnrrssssssssss n product identifier r revision S serial number The kit identifier for SAM R21 Xplained Pro is 2127 7 2 Revision 3 Revision 3 of SAM R21 Xplained Pro is the initial released version there are no known issues Atmel SAM R21 Xplained Pro USER GUIDE 20 Atmel 42243A MCU 02 2014 8 Document revision history Document Comment revision 42243A 02 2014 Initial document release Atmel Atmel SAM R21 Xplained Pro USER GUIDE 21 42243A MCU 02 2014 9 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 tech
24. on the EDBG DGI SPI bus Cortex Debug Connector The cortex debug connector is provided to enable external debuggers to be connected to the ATSAMR21G18A The footpring is made for a 2x5 50 mil connector and the pinout is shown in Table 4 4 Cortex Debug Connector on page 11 This header should only be used when the EDBG is disconnected from the target for more information see 1 8 Operation page 13 Table 4 4 Cortex Debug Connector 1 VCC Target Voltage reference 2 PA31_SWDIO Debug data 3 GND GND 4 PA30_SWCLK Debug clock 5 GND GND 6 NC 7 NC p 8 NC 9 GND GND detect 10 RESETN Target reset Peripherals Crystal The SAM R21 Xplained Pro kit contains one crystals that can be used as clock source for the SAM R21 device The crystal has a cut strap next to it that can be used to measure the oscillator safety factor This is done by Atmel Atmel SAM R21 Xplained Pro USER GUIDE 11 42243A MCU 02 2014 Note 4 2 2 4 2 3 4 2 4 4 2 5 cutting the strap and adding a resistor across the strap More information about oscillator allowance and safety factor can be found in appnote 4100 The 16 MHz crystal is connected directly to the RF die inside the SAM R21 The clock signal generated by the crystal is routed from the CLKM pin on the RF die to a GCLK IO pin on the microcontroller For more information on how the RF die is connected to the microcontroller and how to configure the CLKM pin see
25. ording to USB spec USB spec 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 3 Target USB Note External power is required when the 500mA through the USB connector is not enough to power a connected USB device in a USB host application 3 3 1 Measuring SAM R21 Power Consumption As part of an evaluation of the SAM R21 it can be of interest to measure its power consumption Because the device has a separate power plane VCC MCU P3V3 on this board it is possible to measure the current consumption by measuring the current that is flowing into this plane The VCC P3V3 plane is connected via a jumper to the main power plane VCC TARGET P3V3 and by replacing the jumper with an ammeter it is possible to determine the current consumption To locate the current measurement header refer to Figure 1 1 SAM R21 Xplained Pro Evaluation Kit Overview on page 4 Warning Do not power the board without having the jumper or an ammeter mounted This can cause the SAM R21 to be powered through its I O pins and cause undefined operation of the device 3 4 Standard Headers and Connectors 3 4 1 Xplained Pro Standard Extension Header Atmel All Xplained Pro kits have one or more dual row 20 pin 100mil extension headers Xplained Pro MCU boards have male headers while Xplained Pro extensions have their female counterparts Note that a
26. tation SAM R21 Xplained Pro contains an Embedded Debugger EDBG that can be used to program and debug the ATSAMR21G18A using Serial Wire Debug SWD 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 SAM R21 GPIOs Atmel Studio can be used as a front end for the Embedded Debugger Yel Atmel SAM R21 Xplained Pro USER GUIDE 14 42243A MCU 02 2014 4 4 1 4 4 2 4 4 3 Serial Wire Debug The Serial Wire Debug SWD use two 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 6 Table 4 11 SWD Connections SWD clock PA31 SWD data Virtual COM port The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAMR21G18A UARTS For further information on how to use the Virtual COM port see Embedded Debugger on page 6 Table 4 12 Virtual COM Port Connections Pin on SAM R21 Function 04 SERCOMO PAD 0 UART TXD SAM R21 TX line PA05 SERCOM 1 PAD 1 UART RXD SAM R21 RX line Atmel Data Gateway Interface The Embedded Debugger features an Atmel Data Gateway Interface DGI by using either a SPI or I C port The DGI can be used to send a variety of data from the SAM R21 to the host PC For further information on how to use the DGI interface see Embedded Debugger on page 6
27. ted You ll be presented with relevant information like datasheets and kit documentation You also have the option to launch Atmel Software Framework ASF example applications The target device is programmed and debugged by the on board Embedded Debugger and no external programmer or debugger tool is needed Refer to the Atmel Studio user guide for information regarding how to compile and program the kit Design Documentation and Related Links The following list contains links to the most relevant documents and software for SAM R21 Xplained Pro 1 Xplained Pro products Atmel Xplained Pro is a series of small sized and easy to use evaluation kits for 8 and 32 bit Atmel microcontrollers It consists of a series of low cost MCU boards for evaluation and demonstration of features and capabilities of different MCU families 2 SAM R21 Xplained Pro User Guide PDF version of this User Guide 3 SAM R21 Xplained Pro Design Documentation Package containing schematics BOM assembly drawings 3D plots layer plots etc 4 EDBG User Guide User guide containing more information about the onboard Embedded Debugger 5 Atmel Studio Free Atmel IDE for development of C C and assembler code for Atmel microcontrollers 6 IAR Embedded Workbench for ARM This is a commercial C C compiler that is available for ARM There is a 30 day evaluation version as well as a code size limited kick start version available from their website
28. the SAM R21 datasheet Table 4 5 External 32 768kHz Crystal Pin on SAM R21 Function PA00 XIN32 PA01 XOUT32 Table 4 6 External 16MHz Crystal Pin on SAM R21 Function XTAL1 XIN XTAL2 XOUT Mechanical Buttons SAM R21 Xplained Pro contains two mechanical buttons One button is the RESET button connected to the SAM R21 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 7 Mechanical Buttons Pin on SAM R21 Silkscreen text RESETN RESET PA28 SWO LED There is one yellow LED available on the SAM R21 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 8 LED connections _ on SAM R21 LED PA19 Yellow LEDO USB The SAM R21 Xplained Pro has a micro USB receptable for use with the SAM R21 USB module To be able to detect when a USB cable is connected a GPIO ADC is used to detect the VBUS voltage on the connector Table 4 9 USB Connections Pinon uss O PA07 VBUS Detection PA24 USB D PA25 USB D RF The main feature of SAM R21 Xplained Pro is to show the RF capability of the ATSAMR21G18A device This device has bidirectional 100 ohm differential antenna pins which are fed through a balun Johanson http www atmel com images doc8333 pdf Atmel Atmel SAM R21 Xplained Pro USER GUIDE 12
29. ts set forth by Industry Canada for an uncontrolled environment This equipment should be installed and operated with minimum distance 20 cm between the device and the user or bystanders Cet quipement est conforme aux limites d exposition aux radiofr quences d finies par Industrie Canada pour un environnement non contr l Cet quipement doit tre install et utilis avec un minimum de 20 cm de distance entre le dispositif et l utilisateur ou des tiers Important Any changes or modifications not expressly approved by the party responsible for compliance 6 4 could void the user s authority to operate the equipment The OEM integrator is still responsible for testing their end product for any additional compliance requirements required with this module installed for example digital device emissions PC peripheral requirements etc This Module is labelled with its own IC ID If the IC ID Certification Number is not visible while installed inside another device then the device should display the label on it referring the enclosed module In that case the final end product must be labelled in a visible area with the following Contains Transmitter Module IC 11019A 092127 OR Contains IC 11019A 092127 Ce module est tiquet avec son propre ID IC Si le num ro de certification IC ID n est pas visible lorsqu il est install l int rieur d un autre appareil l appareil doit afficher l tiquette sur le module de r f renc
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