USER GUIDE
Atmel SAM4S Xplained Pro
Preface
The Atmel® SAM4S Xplained Pro evaluation kit is a hardware platform to
evaluate the ATSAM4SD32C microcontroller.
Supported by the Atmel Studio integrated development platform, the kit provides
easy access to the features of the Atmel ATSAM4SD32C 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
ATSAM4SD32C.
The Xplained Pro extension series evaluation kits offers additional peripherals to
extend the features of the board and ease the development of custom designs.
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Table of Contents
Preface .......................................................................................... 1
1. Introduction .............................................................................. 3
1.1. Features .... .... ....... .... .... ........... .... .... ........... .... .... ....... .... .... .. 3
1.2. Kit overview .. ....... .... .... ........... .... .... ........... .... .... ....... .... .... ... 3
2. Getting started ......................................................................... 5
2.1. Quick-start ........... .... .... ........... .... .... ....... .... .... ........... .... .... ... 5
2.2. Connecting the kit .. ........... .... .... ....... .... .... ........... .... .... .......... 5
2.3. Design documentation and related links .... .... ........... .... .... ....... ... 5
3. Xplained Pro ............................................................................ 6
3.1. Embedded Debugger ....... .... .... ........... .... .... ........... .... .... ....... . 6
3.2. Hardware identification system ..... .... .... ........... .... .... ....... .... .... .. 6
3.3. Power supply ..... .... .... ........... .... .... ....... .... .... ........... .... .... ..... 7
3.3.1. Measuring SAM4S power consumption ...... .... .... ........... 7
3.4. Standard headers and connectors ........... .... .... ........... .... .... ...... 7
3.4.1. Xplained Pro extension header ... .... ....... .... .... ........... ... 7
3.4.2. Xplained Pro LCD connector .... .... ........... .... .... ........... . 8
3.4.3. Power header ........ .... .... ........... .... .... ....... .... .... ....... 10
4. Hardware user guide ............................................................ 11
4.1. Connectors ....... .... .... ........... .... .... ........... .... .... ....... .... .... ..... 11
4.1.1. I/O extension headers .......... .... .... ........... .... .... ....... .. 11
4.1.2. LCD extension connector ..... .... .... ........... .... .... ....... ... 12
4.1.3. Other headers .... .... .... ........... .... .... ........... .... .... ...... 14
4.2. Peripherals ....... .... .... ........... .... .... ........... .... .... ....... .... .... ..... 14
4.2.1. NAND Flash . .... ........... .... .... ....... .... .... ........... .... .... . 14
4.2.2. SD Card connector .... ........... .... .... ....... .... .... ........... . 15
4.2.3. Crystals .... ....... .... .... ........... .... .... ........... .... .... ....... . 15
4.2.4. Mechanical buttons ... .... ........... .... .... ....... .... .... ......... 16
4.2.5. LED .... .... .... ........... .... .... ....... .... .... ........... .... .... ..... 16
4.2.6. Analog reference ........... .... .... ....... .... .... ........... .... .... 16
4.3. Embedded Debugger implementation .......... .... .... ....... .... .... ..... 16
4.3.1. Serial Wire Debug .... .... .... ....... .... .... ........... .... .... ..... 16
4.3.2. Virtual COM port .... ........... .... .... ........... .... .... ....... .... 16
4.3.3. Atmel Data Gateway Interface .......... .... .... ........... .... .. 17
5. Hardware revision history and known issues ........................ 18
5.1. Identifying product ID and revision ...... .... .... ........... .... .... ....... .. 18
5.2. Revision 5 .. ........... .... .... ........... .... .... ....... .... .... ........... .... .... 18
5.3. Revision 4 .. ........... .... .... ........... .... .... ....... .... .... ........... .... .... 18
6. Document revision history ..................................................... 19
7. Evaluation board/kit important notice .................................... 20
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1. Introduction
1.1 Features
● Atmel ATSAM4SD32C microcontroller
● Embedded debugger (EDBG)
● USB interface
● Programming and debugging (target) through Serial Wire Debug (SWD)
● Virtual COM-port interface to target via UART
● Atmel Data Gateway Interface (DGI) to target via synchronous SPI or TWI
● Four GPIOs connected to target for code instrumentation
● Digital I/O
● Two mechanical buttons (user and reset button)
● One user LED
● Three extension headers
● LCD display header
● USB interface for host and device function (target)
● 2Gb NAND Flash for non-volatile storage
● SD card connector
● Adjustable analog reference
● Three possible power sources
● External power
● Embedded debugger USB
● Target USB
● 12MHz crystal
● 32kHz crystal
1.2 Kit overview
The Atmel SAM4S Xplained Pro evaluation kit is a hardware platform to evaluate the Atmel ATSAM4SD32C.
The kit offers a set of features that enables the ATSAM4SD32C user to get started using the ATSAM4SD32C
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. SAM4S Xplained Pro evaluation kit overview
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2. Getting started
2.1 Quick-start
3 Steps to start exploring the Atmel Xplained Pro Platform
● Download and install Atmel Studio1.
● Launch Atmel Studio.
● Connect an USB cable to the DEBUG USB port.
2.2 Connecting the kit
When connecting Atmel SAM4S 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. Please refer to the Atmel Studio user guide2 for information
regarding how to compile and program the kit.
2.3 Design documentation and related links
The following list contains links to the most relevant documents and software for SAM4S Xplained Pro.
1. Xplained Pro products 3 - 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. SAM4S Xplained Pro User Guide 4 - PDF version of this User Guide.
3. SAM4S Xplained Pro Design Documentation 5 - Package containing schematics, BOM, assembly
drawings, 3D plots, layer plots etc.
4. Atmel Studio 6 - Free Atmel IDE for development of C/C++ and assembler code for Atmel
microcontrollers.
5. IAR Embedded Workbench® 7 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 16K for devices with M0, M0+ and M1 cores and 32K for devices with
other cores.
6. Atmel sample store 8 - Atmel sample store where you can order samples of devices.
1
http://www.atmel.com/atmelstudio
2
http://www.atmel.com/atmelstudio
3
http://www.atmel.com/XplainedPro
4
http://www.atmel.com/Images/Atmel-42075-SAM4S-Xplained-Pro_User-Guide.pdf
5
http://www.atmel.com/Images/Atmel-42075-SAM4S-Xplained-Pro_User-Guide.zip
6
http://www.atmel.com/atmelstudio
7
http://www.iar.com/en/Products/IAR-Embedded-Workbench/ARM/
8
http://www.atmel.com/system/samplesstore
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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 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 Store1.
3.1 Embedded Debugger
The SAM4S Xplained Pro contains the Atmel® Embedded Debugger (EDBG) for on-board debugging. The
EDBG is a composite USB device of 3 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 ATSAM4SD32C.
On the SAM4S Xplained Pro, the SWD interface is connected between the EDBG and the ATSAM4SD32C.
The Virtual COM Port is connected to a UART port on the ATSAM4SD32C (see section “Embedded Debugger
implementation” on page 16 for pinout), and provides an easy way to communicate with the target
application through a 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. Please,
see section “Embedded Debugger implementation” on page 16 for available interfaces and pinout.
Communication over the interfaces are bidirectional. It can be used to send events and values from the
ATSAM4SD32C, 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 SAM4S Xplained Pro, a power LED and a status LED. Table 3.1, “EDBG LED
control” 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.
Bootloader mode (idle) The power LED and the status LED blinks simultaneously.
Bootloader mode (firmware
upgrade)
For further documentation on the EDBG, see the EDBG User Guide.
3.2 Hardware identification system
All Xplained Pro compatible extension boards have an Atmel ATSHA204 crypto authentication 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” 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
Activity indicator, LED flashes
every time something happens on
the EDBG.
The power LED and the status LED blinks in an alternating pattern.
1
http://store.atmel.com/CBC.aspx?q=c:100113
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Data Field Data Type Example Content
Maximum Voltage [mV] uint16_t 3600
Maximum Current [mA] uint16_t 30
3.3 Power supply
The SAM4S Xplained Pro kit can be powered either by USB or by an external power source through the 4pin power header, marked PWR. This connector is described in “Power header” on page 10. The available
power sources and specifications are listed in Table 3.3, “Power sources for SAM4S Xplained Pro”.
Table 3.3. Power sources for SAM4S Xplained Pro
Power input Voltage requirements Current requirements Connector marking
External power 5 V +/- 2 % (+/- 100 mV)
for USB host operation.
4.3 V to 5.5 V if USB
host operation is not
required
Embedded debugger
USB
4.4V to 5.25V
(according to USB spec)
Target USB 4.4V to 5.25V
(according to USB spec)
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.
500 mA (according to
USB spec)
500 mA (according to
USB spec)
PWR
DEBUG USB
TARGET 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
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 SAM4S power consumption
As part of an evaluation of the SAM4S 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 is connected
via a jumper to the main power plane (VCC_TARGET_P3V3) and by replacing the jumper with an ampere
meter it is possible to determine the current consumption. To locate the current measurement header, please
refer to Figure 1.1, “SAM4S Xplained Pro evaluation kit overview”.
Warning
Do not power the board without having the jumper or an ampere meter mounted. This can cause
the SAM4S 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 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”. The extension headers can be used to connect a wide variety of Xplained Pro
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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 Name 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
5 GPIO1 General purpose IO
6 GPIO2 General purpose IO
7 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 IO.
10 SPI_SS_B/GPIO Slave select for SPI and/or general purpose IO.
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
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
3.4.2 Xplained Pro LCD connector
The LCD connector provides the ability to connect to display extensions that have a parallel interface. The
connector implements signals for a MCU parallel bus interface and a LCD controller interface as well as signals
for a touchcontroller. The connector pin-out definition is shown in Table 3.5, “Xplained Pro LCD connector”.
Note that usually only one display interface is implemented, either LCD controller or the MCU bus interface.
A FPC/FFC connector with 50 pins and 0.5mm pitch is used for the LCD connector. The connector
(XF2M-5015-1A) from Omron is used on several designs and can be used as a reference.
Table 3.5. Xplained Pro LCD connector
Pin number Name RGB interface
1 ID Communication line to ID chip on extension board.
2 GND Ground
3 D0 Data line
4 D1 Data line
5 D2 Data line
6 D3 Data line
MCU interface
description
description
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Pin number Name RGB interface
description
MCU interface
description
7 GND Ground
8 D4 Data line
9 D5 Data line
10 D6 Data line
11 D7 Data line
12 GND Ground
13 D8 Data line
14 D9 Data line
15 D10 Data line
16 D11 Data line
17 GND Ground
18 D12 Data line
19 D12 Data line
20 D14 Data line
21 D15 Data line
22 GND Ground
23 D16 Data line
24 D17 Data line
25 D18 Data line
26 D19 Data line
27 GND Ground
28 D20 Data line
29 D21 Data line
30 D22 Data line
31 D23 Data line
32 GND Ground
33 PCLK /
CMD_DATA_SEL
Pixel clock Command and data
select. One address line
of the MCU for displays
where it is possible to
select either the register
or the data interface.
34 VSYNC / CS Vertical synchronization Chip select
35 HSYNC / WE Horizontal
Write enable signal
synchronization
36 DATA ENABLE / RE Data enable signal Read enable signal
37 SPI SCK Clock for Serial peripheral interface
38 SPI MOSI Master out slave in line of Serial peripheral interface
39 SPI MISO Master in slave out line of Serial peripheral interface
40 SPI SS Slave select for SPI. Should be unique if possible
41 ENABLE Display enable signal
42 TWI SDA I2C data line (maxTouch)
43 TWI SCL I2C clock line (maxTouch)
44 IRQ1 maxTouch interrupt line
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Pin number Name RGB interface
45 IRQ2 Interrupt line for other I2C devices
46 PWM Backlight control
47 RESET Reset for both display and maxTouch
48 VCC 3.3V power supply for extension board
49 VCC 3.3V power supply for extension board
50 GND Ground
3.4.3 Power header
The power header can be used to connect external power to the SAM4S 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, please refer to
Figure 1.1, “SAM4S Xplained Pro evaluation kit overview”
Table 3.6. Power header PWR
Pin number PWR header Pin name Description
1 VEXT_P5V0 External 5V input
2 GND Ground
3 VCC_P5V0 Unregulated 5V (output, derived
4 VCC_P3V3 Regulated 3.3V (output, used as
description
MCU interface
description
from one of the input sources)
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.
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4. Hardware user guide
4.1 Connectors
This chapter describes the implementation of the relevant connectors and headers on SAM4S Xplained Pro
and their connection to the ATSAM4SD32C. The tables of connections in this chapter also describes which
signals are shared between the headers and on-board functionality.
4.1.1 I/O extension headers
The SAM4S Xplained Pro headers EXT1, EXT2 and EXT3 offers 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. All headers have a pitch of
2.54 mm.
Table 4.1. Extension header EXT1
Pin on EXT1 SAM4S pin Function Shared functionality
1 - - Communication line to ID chip on
extension board.
2 - - GND
3 PA17 AD[0]
4 PA18 AD[1]
5 PA24 GPIO PIOD Interface Header
6 PA25 GPIO PIOD Interface Header
7 PA23 PWMH0 PIOD Interface Header
8 PA19 PWML0
9 PA1 WKUP1/GPIO
10 PA6 GPIO DGI_GPIO0 on EDBG
11 PA3 TWD0 EXT2 and EDBG
12 PA4 TWCK0 EXT2 and EDBG
13 PA21 USART1/RXD1 EXT2
14 PA22 USART1/TXD1 EXT2
15 PA11 SPI/NPCS[0]
16 PA13 SPI/MOSI EXT2, EXT3, LCD connector (EXT4) and
EDBG
17 PA12 SPI/MISO EXT2, EXT3, LCD connector (EXT4) and
EDBG
18 PA14 SPI/SPCK EXT2, EXT3, LCD connector (EXT4) and
EDBG
19 - - GND
20 - - VCC
Table 4.2. Extension header EXT2
Pin on EXT2 SAM4S pin Function Shared functionality
1 - - Communication line to ID chip on
extension board.
2 - - GND
3 PB0 AD[4]
4 PB1 AD[5]
5 PC24 GPIO DGI_GPIO2 on EDBG
6 PC25 GPIO DGI_GPIO3 on EDBG
7 PC19 PWMH1
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Pin on EXT2 SAM4S pin Function Shared functionality
8 PA20 PWML1
9 PC26 GPIO
10 PC27 GPIO
11 PA3 TWD0 EXT1 and EDBG
12 PA4 TWCK0 EXT1 and EDBG
13 PA21 USART1/RXD1 EXT1
14 PA22 USART1/TXD1 EXT1
15 PA9 SPI/NPCS[1] LCD connector (EXT4)
16 PA13 SPI/MOSI EXT1, EXT3, LCD connector (EXT4) and
EDBG
17 PA12 SPI/MISO EXT1, EXT3, LCD connector (EXT4) and
EDBG
18 PA14 SPI/SPCK EXT1, EXT3, LCD connector (EXT4) and
EDBG
19 - - GND
20 - - VCC
Table 4.3. Extension header EXT3
Pin on EXT3 SAM4S pin Function Shared functionality
1 - - Communication line to ID chip on
extension board.
2 - - GND
3 PC29 AD[13]
4 PC30 AD[14]
5 PC21 GPIO
6 PC22 GPIO DGI_GPIO1 on EDBG
7 PC20 PWMH2
8 PA16 PWML2 PIOD Header
9 PA0 WKUP0/GPIO LCD connector (EXT4)
10 PC31 GPIO
11 PB4 TWD1 LCD connector (EXT4)
12 PB5 TWCK1 LCD connector (EXT4)
13 PB2 USART1/RXD1 CDC UART
14 PB3 USART1/TXD1 CDC UART
15 PA10 SPI/NPCS[2] LCD connector (EXT4)
16 PA13 SPI/MOSI EXT1, EXT2, LCD connector (EXT4) and
EDBG
17 PA12 SPI/MISO EXT1, EXT2, LCD connector (EXT4) and
EDBG
18 PA14 SPI/SPCK EXT1, EXT2, LCD connector (EXT4) and
EDBG
19 - - GND
20 - - VCC
4.1.2 LCD extension connector
Extension connector EXT4 is a special connector for LCD displays. The physical connector is an Omron
Electronics XF2M-5015-1A FPC connector.
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Table 4.4. LCD display connector EXT4
Pin on EXT4 SAM4S pin Function Shared functionality
1 - - Communication line to ID chip on
extension board.
2 - - GND
3 PC0 D0 NAND Flash
4 PC1 D1 NAND Flash
5 PC2 D2 NAND Flash
6 PC3 D3 NAND Flash
7 - - GND
8 PC4 D4 NAND Flash
9 PC5 D5 NAND Flash
10 PC6 D6 NAND Flash
11 PC7 D7 NAND Flash
12 - - GND
13 - -
14 - -
15 - -
16 - -
17 - - GND
18 - -
19 - -
20 - -
21 - -
22 - - GND
23 - -
24 - -
25 - -
26 - -
27 - - GND
28 - -
29 - -
30 - -
31 - -
32 - - GND
33 PC18 A0
34 PC15 NPCS[1]
35 PC8 NWE
36 PC11 NRD
37
38
39
40
41 PB14 GPIO
42 PB4 TWD1/SDA EXT3
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Pin on EXT4 SAM4S pin Function Shared functionality
43 PB5 TWCK1/SCL EXT3
44 PA0 WKUP0 EXT3
45 - -
46 PA15 PWML3 PIOD Interface header
47 PC28 GPIO
48 - VCC_P3V3
49 - VCC_P3V3 EXT2
50 - GND
4.1.3 Other headers
In addition to the “I/O extension headers” on page 11, SAM4S Xplained Pro has two additional headers
with spare signals that offers access to the I/O of the microcontroller which are otherwise not easily available
elsewhere or might be favourable to have collected toghether. All headers have a pitch of 2.54mm.
Table 4.5. SPARE SIGNALS header
Pin on header SAM4S pin Function Shared functionality
1 PA2 DATRG User button, SW0
2 PA9 PWMF10 EXT2
3 PA26 TI0A2 SD Card and PIOD Interface header
4 PA27 TI0B2 SD Card and PIOD Interface header
5 PA28 TCLK1 SD Card and PIOD Interface header
6 PA29 TCLK2 SD Card and PIOD Interface header
7 PA31 PCK2 SD Card and PIOD Interface header
8 PB0 RTCOUT0 EXT2
9 PB1 RTCOUT1 EXT2
10 PB13 DAC0
11 PB14 DAC1
12 - - GND
Table 4.6. PIOD INTERFACE header
Pin on header SAM4S pin Function Shared functionality
1 PA15 PIODCEN1 LCD connector
2 PA16 PIODCEN2 EXT3
3 PA23 PIODCCLK EXT1
4 PA24 PIODC0 EXT1
5 PA25 PIODC1 EXT1
6 PA26 PIODC2 SD Card and SPARE Signals header
7 PA27 PIODC3 SD Card and SPARE Signals header
8 PA28 PIODC4 SD Card and SPARE Signals header
9 PA29 PIODC5 SD Card and SPARE Signals header
10 PA30 PIODC6 SD Card
11 PA31 PIODC7 SD Card and SPARE Signals header
12 - - GND
4.2 Peripherals
4.2.1 NAND Flash
The SAM4S Xplained Pro kit has one 2Gb NAND Flash connected to the external bus interface of the SAM4S.
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Table 4.7. NAND Flash connections
SAM4S pin Function NAND Flash
PC0 D0 IO0 LCD connector
PC1 D1 IO1 LCD connector
PC2 D2 IO2 LCD connector
PC3 D3 IO3 LCD connector
PC4 D4 IO4 LCD connector
PC5 D5 IO5 LCD connector
PC6 D6 IO6 LCD connector
PC7 D7 IO7 LCD connector
PC9 NANDOE RE (active low)
PC10 NANDWE WE (active low)
PC13 GPIO R (active high)/ B
PC14 NCS[0] CE (active low)
PC16 NANDALE ALE (active low)
PC17 NANDCLE CLE
4.2.2 SD Card connector
Shared functionality
function
(active low)
The SAM4S Xplained Pro kit has one SD card connector which is connected to High Speed Multimedia Card
Interface (HSMCI) of the SAM4S
Table 4.8. SD Card connections
SAM4S pin Function SD Card function Shared functionality
PA26 MCDA2 DAT2 SPARE Signal and PIOD Interface
PA27 MCDA3 DAT3 SPARE Signal and PIOD Interface
PA28 MCCDA CMD SPARE Signal and PIOD Interface
PA29 MCCK CLK SPARE Signal and PIOD Interface
PA30 MCDA0 DAT0 PIOD Interface header
PA31 MCDA1 DAT1 SPARE Signal and PIOD Interface
PC12 GPIO Card Detect
4.2.3 Crystals
The SAM4S Xplained Pro kit contains two crystals that can be used as clock sources for the SAM4S device.
Each 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 AVR41001.
headers
headers
headers
headers
headers
Table 4.9. External 32.768kHz crystals
Pin on SAM4S Function
PA49 XIN32
PA48 XOUT32
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Table 4.10. External 12MHz crystals
Pin on SAM4S Function
PB9 XIN0
PB8 XOUT0
4.2.4 Mechanical buttons
SAM4S Xplained Pro contains two mechanical buttons. One button is the RESET button connected to the
SAM4S 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 4.11. Mechanical buttons
Pin on SAM4S Silkscreen text
NRST RESET
PC24 SW0
4.2.5 LED
There is one yellow LED available on the SAM4S 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 4.12. LED connections
Pin on SAM4S LED
PC23 Yellow LED0
4.2.6 Analog reference
An adjustable voltage reference is implemented on the kit to have a reference for the ADC or DAC. The
reference can be adjusted with the on-board multiturn trimmer potentiometer. Next to the potentiometer, a 2-pin
header is available to measure the reference voltage for the AREF pin of the SAM4S. The voltage output range
for the reference is 0V - 3.36V.
4.3 Embedded Debugger implementation
SAM4S Xplained Pro contains an Embedded Debugger (EDBG) that can be used to program and debug the
ATSAM4SD32C 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 SAM4S
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 4.13. SWD connections
Pin on SAM4S Function
PB7 SWD clock
PB6 SWD data
PB5 SWD trace output
PB12 Erase
4.3.2 Virtual COM port
The Embedded Debugger act as a Virtual Com Port gateway by using one of the ATSAM4SD32C UARTs. For
further information on how to use the Virtual COM port see “Embedded Debugger” on page 6.
Table 4.14. Virtual COM port connections
Pin on SAM4S Function
PB3 UART TXD (SAM4S TX line)
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Pin on SAM4S Function
PB2 UART RXD (SAM4S 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 TWI port.
The DGI can be used to send a variety of data from the SAM4S to the host PC. For further information on how
to use the DGI interface see “Embedded Debugger” on page 6.
Table 4.15. DGI interface connections when using SPI
Pin on SAM4S Function
PA5 Slave select (SAM4S is Master)
PA12 SPI MISO (Master In, Slave Out)
PA13 SPI MOSI (Master Out, Slave in)
PA14 SPI SCK (Clock Out)
Table 4.16. DGI interface connections when using TWI
Pin on SAM4S Function
PA3 SDA (Data line)
PA4 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 SAM4S application
code. For further information on how to configure and use the GPIO monitoring features see “Embedded
Debugger” on page 6.
Table 4.17. GPIO lines connected to the EDBG
Pin on SAM4S Function
PA6 GPIO0
PA22 GPIO1
PA24 GPIO2
PA25 GPIO3
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5. Hardware revision history and known issues
5.1 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 board to a computer with Atmel Studio running, an information window will
pop up. The first 6 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-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 kit identifier for SAM4S Xplained Pro is 1803.
5.2 Revision 5
On this revision, the SPI clock net is improved to reduce any issues that might be caused by reflections. The
SPI has been removed from the LCD (EXT4 connector) to reduce load on the clock net. The remaining clock
lines have been divided into four terminated nets for each SPI source (EXT1, EXT2, EXT3, and EDBG) and
routed in a star like layout. A series terminator resistor of 43ohm is placed on each clock net, close to the SPI
clock pin. This reduces any issues that might be caused by reflections comming back from unterminated/
unused clock lines. It also reduces the rise/fall time of the clock edges and that will also help to reduce any
reflection issues.
5.3 Revision 4
Known issues
● SAM4S has an on-die series termination of the SPI CLK which makes this signal not usable for a multi
drop clock distribution because all devices along the line will see a fraction of VCC until the signal is
reflected from the end of the transmission line. On the SAM4S Xplained Pro revision 4 this signal is
routed to each extension connector with EXT1 at the end of the line. That means extensions that are
connected along the transission line e.g. EXT3 header is likely to fail due to a non-monotinic edge caused
by relections and the fraction of VCC that is present for a short time until the reflection comes back from
the end of the line.
Workaround:
● By slowing down the clock rise time with a capacitor, and thus effectively increasing the line length at
which point it becomes a transmission line, it is possible to remove the clock issue. A 56pF capacitor
has been mounted on the bottom side of the board between the SPI clock and GND. This however
reduces the maximum SPI clock speed and it is recommended to not run this faster than 30MHz (this
also depends on how much additional capacitance is added by connected extensions and needs to
be checked case by case). The capacitor was added on revision 4 on the bottom side of the EXT3
header.
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6. Document revision history
Doc. Rev. Date Comment
B 15/03/2013 Added information about changes done on rev 5
A 11/02/2013 First release
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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 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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Atmel Corporation 1600 Technology Drive, San Jose, CA 95110 USA T: (+1)(408) 441.0311 F: (+1)(408) 436.4200 | www.atmel.com
© 2013 Atmel Corporation. All rights reserved. / Rev.: Atmel-42075B-MCU-Atmel SAM4S Xplained Pro-USER GUIDE-03/2013
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