Atmel SAM D20 Xplained Pro (USER GUIDE)
Contents
1. 15 Atmel SAM D20 Xplained Pro USER GUIDE 2 42102C MCU 02 2014 1 1 1 2 Atmel Introduction Features Atmel ATSAMD20J18A microcontroller Embedded debugger EDBG e USB interface e Programming and debugging on board SAM D20 through Serial Wire Debug SWD e Programming and debugging external targets 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 Three extension headers Two possible power sources e External power e Embedded debugger USB 32kHz crystal Kit Overview The Atmel SAM D20 Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel ATSAMD20J18A The kit offers a set of features that enables the ATSAMD20J18A user to get started using the ATSAMD20J18A peripherals right away and to get an understanding of how to integrate the device in their own design Atmel SAM D20 Xplained Pro USER GUIDE 3 42102C MCU 02 2014 Figure 1 1 SAM D20 Xplained Pro Evaluation Kit Overview SWO USER BUTTON RESET BUTTON DEBUG USB CURRENT MEASUREMENT HEADER USER LEDO cho 1 59 POWER G lt lt EXTERNAL Sev vec HEADER PROG DEBUG aL INTERFACE GNO pass paes EXTENSION 1 PAOS PAOD lt HEADER2. 7 3 3 1 Measuring SAM 020 Power Consumption 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 9 4 1 OCOhleCtOlS 9 41 1 I O Extension Headers 9 4 2 Peripherals Anes cabs ep na e 10 4 2 4 Crystal i iii pea 10 42 2 Mechanical Buttons 11 4 239 LED nen 11 4 3 Embedded Debugger Implementation 11 43 1 Serial Wire Debug rhet 11 492 Minual COM POr s eee asec 11 4 3 3 Atmel Data Gateway Interface 11 4 3 4 External Programming and Debugging 12 5 Hardware Revision History and Known Issues 13 5 1 Identifying Product ID and Revision 13 5 2 Revision D 13 59 REVISION EUER 13 6 Document Revision History 14 Evaluation Board Kit Important Notice
3. http www atmel com Images Atmel 42102 SAMD20 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 D20 Xplained Pro USER GUIDE 5 42102C 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 and example code through Atmel Studio Available Xplained Pro MCU and extension boards can be purchased in the Atmel Web Store Embedded Debugger The SAM D20 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 A
4. and program the kit Design Documentation and Related Links The following list contains links to the most relevant documents and software for SAM D20 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 D20 Xplained Pro User Guide PDF version of this User Guide 3 SAM D20 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 The code size limit is 16KB for devices with and M1 cores and 2 for devices with other cores 7 Atmel sample store Atmel sample store where you can order samples of devices http www atmel com atmelstudio 2 http www atmel com atmelstudio 2 http www atmel com XplainedPro li http www atmel com Images Atmel 42102 SAMD20 Xplained Pro User Guide pdf
5. is shared between EXT1 2 and 3 UART s but uses different pins Table 4 3 Extension Header EXT3 SAM 020 Function 1 Communication line to ID chip on extension board 2 GND 3 PA02 AIN O 4 5 PB30 GPIO 6 PA15 GPIO Onboard SWO 7 PA12 TC2 WO 0 8 PA13 TC2 WO 1 9 PA28 EXTINT 8 10 PA27 GPIO 11 SERCOM2 PAD 0 PC SDA EXT1 EXT2 and EDBG 12 9 SERCOM2 PAD 1 PC SCL EXT1 EXT2 and EDBG 13 PB11 SERCOM4 PAD 3 UART RX 14 PB10 SERCOM4 PAD 2 UART 15 17 SERCOM5 PAD 1 SPI SS 16 PB22 SERCOM5 PAD 2 SPI MOSI EDBG 17 PB16 SERCOM5 PAD 0 SPI MISO EDBG 18 PB23 SERCOM5 PAD 3 SPI EDBG 19 GND 20 Notes The SERCOM4 module is shared between EXT1 2 and 3 UART s but uses different pins 4 2 Peripherals 4 2 1 Crystal Atmel The SAM D20 Xplained Pro kit contains one crystals that can be used as clock source for the SAM D20 device The crystal has a cut strap next to it that can be used to measure the oscillator safety factor 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 4100 http www atmel com images doc8333 pdf Atmel SAM D20 Xplained Pro USER GUIDE 10 42102C MCU 02 2014 Table 4 4 External 32 768kHz Crystal Pin on SAM D20 Function PAOO XIN32 PAO1 XOUT32 4 2 2 Mechanical Buttons SAM D20 Xplained Pro conta
6. puos 13 O S Paos Paos 15 32kHz mons CRYSTAL GNO vcc gt 9 SAMD20J18 gag SAMD20I18 pato pan EXTENSION 2 HEADER lt put3 P912 13 V PAIS 15 C Q 16 PASIG lt vec we lt 5 9 PAIS P830 w 2 EXTENSION 3 HEADER 42102C MCU 02 2014 Atmel Atmel SAM D20 Xplained Pro USER GUIDE 4 2 1 2 2 2 3 Getting started Quick start 3 Steps to start exploring the Atmel Xplained Pro Platform 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 D20 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 connected 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
7. 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 Atmel Atmel SAM D20 Xplained Pro USER GUIDE 15 42102C MCU 02 2014 Atmel Enabling Unlimited Possibilities Atmel Corporation 1600 Technology Drive San Jose 95110 USA T 1 408 441 0311 F 1 408 436 4200 www atmel com 2014 Atmel Corporation All rights reserved Rev 42102C MCU 02 2014 A
8. 3 4 External Programming and Debugging The SAM D20 Xplained Pro features a Cortex Debug Connector 10 pin for programming and debugging an external target The connector is limited to the SWD interface and is intended for in system programming and debugging of SAM D20 devices in the users final products The debug connector is connected to the onboard EDBG through level shifters and switches When an external target voltage is detected the EDBG will switch the SWD interface from the onboard target device to the external debug connector and the green LED next to the connector will be lit The voltage of the external target must be between 1 6V and 5 0V Note This connector can t be used for attaching an external debug unit for programming and debugging the onboard device Table 4 12 Cortex Debug Connector Specification Function implemented 1 VCC VCC 2 SWDIO TMS SWDIO 3 GND GND 4 SWDCLK TCK SWDCLK 5 GND GND 6 SWO TDO NC 7 KEY NC 8 NC TDI NC 9 GNDDetect GND 10 nRESET nRESET Atmel Atmel SAM D20 Xplained Pro USER GUIDE 12 42102C MCU 02 2014 5 1 5 2 5 3 Hardware Revision History and Known Issues 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 board to a computer with Atmel Studio running an information window w
9. 5 A SPI MOSI SPI MISO SPI SCK GND VCC 3 4 2 Xplained Pro Power Header Ground Analog to digital converter alternatively positive part of differential ADC Analog to digital converter alternatively negative part of differential ADC General purpose General purpose Pulse width modulation alternatively positive part of differential PWM Pulse width modulation alternatively positive part of differential PWM Interrupt request line and or general purpose Slave select for SPI and or general purpose I O Data line for two wire interface Always implemented bus type Clock line for two wire interface Always implemented bus type Receiver line of Universal Synchronous and Asynchronous serial Receiver and Transmitter Transmitter line of Universal Synchronous and Asynchronous serial Receiver and Transmitter Slave select for SPI Should be unique if possible Master out slave in line of Serial peripheral interface Always implemented bus type Master in slave out line of Serial peripheral interface Always implemented bus type Clock for Serial peripheral interface Always implemented bus type Ground Power for extension board The power header can be used to connect external power to the SAM D20 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 boar
10. Atmel USER GUIDE Atmel SAM D20 Xplained Pro Preface The Atmel SAM D20 Xplained Pro evaluation kit is a hardware platform to evaluate the ATSAMD20J18A microcontroller Supported by the Atmel Studio integrated development platform the kit provides easy access to the features of the Atmel ATSAMD20J18A 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 ATSAMD20J18A The Xplained Pro extension kits offers additional peripherals to extend the features of the board and ease the development of custom designs 42102C 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 PO AMINES Desc 3 127 Kit OVerVIeW coru poe SERA STR PAR 3 2 Getting started successi pies perdi es Rake 5 2 1 Quickestart MERE ERU 5 22 Connecting the don aie reges Eun 5 2 3 Design Documentation and Related Links 5 3 Xplained Pro ee 6 3 4 Embedded Deb gger 6 3 2 Hardware Identification System sse 6 2 9 POWER Supply ssi ode uio
11. COM port see Embedded Debugger on page 6 Table 4 8 Virtual COM Port Connections PA24 SERCOMS PAD 2 UART TXD SAM D20 TX line PA25 SERCOMS PAD 3 UART RXD SAM 020 RX line 4 3 3 Atmel Data Gateway Interface The Embedded Debugger features an Atmel Data Gateway Interface DGI by using either a SPI or port The DGI can be used to send a variety of data from the SAM D20 to the host PC For further information on how to use the DGI interface see Embedded Debugger on page 6 Table 4 9 DGI Interface Connections when using SPI PB31 SERCOMS PAD 1 SPI SS Slave select SAM D20 is Master Atmel Atmel SAM D20 Xplained Pro USER GUIDE 11 42102C MCU 02 2014 Pin on SAM D20 Function PB16 SERCOM5 PADJ 0 SPI MISO Master In Slave Out PB22 SERCOM5 PAD 2 SPI MOSI Master Out Slave in PB23 SERCOMS PAD 3 SPI Clock Out Table 4 10 DGI Interface Connections when using 8 SERCOM2 PAD 0 SDA Data line PA09 SERCOM2 PAD 1 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 D20 application code For further information on how to configure and use the GPIO monitoring features see Embedded Debugger on page 6 Table 4 11 GPIO Lines Connected to the EDBG PA27 GPIOO PA28 GPIO1 PA20 GPIO2 PA21 GPIO3 4
12. D 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 Manufacturer ASCII 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 CBC aspx q c 100113 http www atmel com Images Atmel 42096 Microcontrollers Embedded Debugger_User Guide pdf Atmel Atmel SAM D20 Xplained Pro USER GUIDE 6 42102C MCU 02 2014 3 3 3 3 1 Warning 3 4 3 4 1 Dat
13. Pin on EXT1 SAM D20 pin Shared functionality Communication line to ID chip on extension board 2 GND PBOO AIN 8 4 PB01 AIN 9 5 7 7 2 TC6 WO 0 8 PBO3 TC6 WO 1 9 PB04 EXTINT 4 10 5 11 8 SERCOM2 PAD 0 PC SDA EXT2 EXT3 and EDBG 12 9 SERCOM2 PAD 1 2 SCL EXT2 EXT3 and EDBG 13 PBO9 SERCOM4 PAD 1 UART RX 14 8 SERCOM4 PAD 0 UART T 15 5 SERCOMO PAD 1 SPI 16 SERCOMO PAD 2 SPI MOSI 17 PA04 SERCOMO PAD 0 SPI MISO 18 PAO7 SERCOMO PAD 3 SPI SCK 19 GND 20 Notes 1 SERCOM4 module is shared between EXT1 2 and 3 UART s but uses different pins Table 4 2 Extension Header EXT2 Pin on EXT2 SAM D20 pin es Shared functionality Communication line to ID chip on extension board 2 GND 3 PA10 AIN 18 4 PA11 AIN 19 5 PA20 GPIO 6 PA21 GPIO 7 PA22 TC4 WO 0 8 PA23 TCA WO 1 Atmel Atmel SAM D20 Xplained Pro USER GUIDE 9 42102C MCU 02 2014 Pinon EXT2 SAMD20pin Function Shared functionality PB14 EXTINT 14 10 PB15 GPIO 11 PA08 SERCOM2 PAD 0 PC SDA EXT1 EXT3 and EDBG 12 9 SERCOM2 PAD 1 PC SCL EXT1 EXT3 and EDBG 13 PB13 SERCOM4 PAD 1 UART 14 12 SERCOM4 PAD 0 UART 15 17 SERCOM1 PAD 1 SPI SS 16 PA18 SERCOM1 PAD 2 SPI MOSI 17 PA16 SERCOM 1 PAD 0 SPI MISO 18 PA19 SERCOM1 PAD 3 SPI SCK 19 GND 20 VCC Notes 1The SERCOM4 module
14. a Field Data Example Content Minimum Voltage mV uint16 t 3000 Maximum Voltage mV uint16 t 3600 Maximum Current mA uint16 t 30 Power Supply The SAM D20 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 D20 Xplained Pro on page 7 Table 3 3 Power Sources for SAM D20 Xplained Pro Voltage requirements Current requirements Connector marking External power 4 3V to 5 5V Recommended PWR minimum is 500mA to be able to provide enough current for extentions and the board itself Recommended maximum is 2A due to the input protection maximum current specification Embedded debugger 4 4V to 5 25V 500 mA according to DEBUG USB USB according 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 Measuring SAM D20 Power Consumption As part of an evaluation of the SAM D20 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_MCU_P3V3 plane
15. able of these may result in a higher sensitivity than optimal for the sensor The PTC will not detect all touches This errata does not affect mutual capacitance mode which operates as specified Fix Workaround e Use 020 revision C or later for self capacitance capacitive touch sensing These are mounted on revision 5 or later of the SAM D20 Xplained Pro kit e VDDcore decoupling capacitor The VDDCcore output on SAMD20J18A has two decoupling capacitors one 100nF and one 4 7uF This might lead to a high power consumption when leaving STANDBY sleep mode and the regulator returns to normal operating mode Fix Workaround Change the 4 7uF tantalum capacitor C315 to 1uF ceramic capacitor Atmel Atmel SAM D20 Xplained Pro USER GUIDE 13 42102C MCU 02 2014 6 Document Revision History Document Date Comment revision 42102C 02 2014 Updated Hardware Revision History and Known Issues on page 13 and Table 4 3 Extension Header on page 10 42102B 10 2013 Updated Hardware Revision History and Known Issues on page 13 42102A 06 2013 First release Atmel SAM D20 Xplai P ER IDE 14 Atmel mel S 0 Xplained Pro USER GUIDE 42102C MCU 02 2014 7 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
16. ds 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 D20 Xplained Pro Evaluation Kit Overview on page 4 Table 3 5 Power Header PWR 1 2 3 Note Atmel VEXT P5VO External 5V input Ground VCC P5VO Unregulated 5V output derived from one of the input sources VCC Regulated 3 3V output used as main power for the kit 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 Atmel SAM D20 Xplained Pro USER GUIDE 8 42102C MCU 02 2014 4 1 Hardware User Guide Connectors This chapter describes the implementation of the relevant connectors and headers on 020 Xplained Pro and their connection to the ATSAMD20J18A The tables of connections in this chapter also describes which signals are shared between the headers and on board functionality Extension Headers The SAM D20 Xplained Pro headers EXT1 EXT2 and 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 Xplained Pro Standard Extension Header page 7 All headers have a pitch of 2 54 mm Table 4 1 Extension Header EXT1
17. he right to make 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
18. ill 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 Most kits will print the identifier and revision in plain text as A09 nnnnVr 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 kit identifier for SAM D20 Xplained Pro is 1873 Revision 5 Revision 5 of SAM D20 Xplained Pro has revision C of the SAMD20J18A device mounted Known issues e VDDcore decoupling capacitor The VDDCcore output pin on SAMD20J18A has two decoupling capacitors 100nF and one 4 7 This might lead to a high power consumption when leaving STANDBY sleep mode and the regulator returns to normal operating mode Fix Workaround e Change the 4 7uF tantalum capacitor C315 to 1uF ceramic capacitor Revision 4 Revision 4 of SAM D20 Xplained Pro is the initial released version Known issues e PTC in self capacitance mode Revision B of the SAM D20 is mounted on this kit The two lowest gain settings are not selectable and an attempt by the QTouch Library to set en
19. ins two mechanical buttons One button is the RESET button connected to the SAM 020 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 5 Mechanical Buttons Pin on SAM D20 Silkscreen text RESETN RESET PA15 SWO 42 3 LED There is one yellow LED available on the SAM D20 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 6 LED connections Pin on SAM D20 LED PA14 Yellow LEDO 4 3 Embedded Debugger Implementation SAM D20 Xplained Pro contains an Embedded Debugger EDBG that can be used to program and debug the ATSAMD20J18A 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 D20 GPIOs Atmel Studio can be used as a front end for the Embedded Debugger 4 3 1 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 7 SWD Connections Pin on SAM D20 Function PA30 mE SWD clock 1 SWD data 4 3 2 Virtual COM Port The Embedded Debugger acts as a Virtual Com Port gateway by using one of the ATSAMD20J18A UARTS For further information on how to use the Virtual
20. 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 020 Xplained Pro Evaluation Kit Overview page 4 Do not power the board without having the jumper or an ammeter mounted This can cause the SAM D20 to be powered through its I O pins and cause undefined operation of the device Standard Headers and Connectors Xplained Pro Standard Extension Header 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 all pins are not always connected However all the connected pins follow the defined pin out described in Table 3 4 Xplained Pro Extension Header on page 7 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 ame stot er Communication line to the ID chip on extension board Atmel Atmel SAM D20 Xplained Pro USER GUIDE 7 42102C MCU 02 2014 Pin number Name 2 3 19 20 GND ADC ADC GPIO1 GPIO2 PWM PWM IRQ GPIO SPI SS B GPIO TWI_SDA TWI SCL USART RX USART TX SPI 5
21. tmel 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 Cortex and others is a registered trademark 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 t
22. tmel Studio the EDBG debugger interface can program and debug the ATSAMD20J18A On the SAM D20 Xplained Pro the SWD interface is connected between the EDBG and the ATSAMD20J18A The Virtual COM Port is connected to a UART port on the ATSAMD20J18A see section Embedded Debugger Implementation on page 11 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 11 for available interfaces and pinout Communication over the interfaces are bidirectional It can be used to send events and values from the ATSAMD20J18A 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 The DGI uses a proprietary protocol and is thus only compatible with Atmel Studio The EDBG controls two LEDs on SAM 020 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 LE
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