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AVR 8-bit Microcontrollers
ATmega328PB Xplained Mini
USER GUIDE
Introduction
This user guide describes how to get started with the Atmel
®
ATmega328PB
Xplained Mini board. The ATmega328PB Xplained Mini evaluation kit is a hardware platform to evaluate the Atmel ATmega328PB microcontroller. The evaluation kit comes with a fully integrated debugger that provides seamless integration with Atmel Studio 6.2 (and later version). The kit provides access to the features of the ATmega328PB enabling easy integration of the device in a custom design.
Atmel-42469A-ATmega328PB-Xplained-Mini_User Guide-07/2015
Table of Contents
Programming the Target using an External Programmer.............................................. 6
Programming the ATmega32U4 using an External Programmer...................................6
Programming the ATmega32U4 using a Bootloader..................................................... 7
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1. Getting Started
1.1. Features
The ATmega328PB Xplained Mini evaluation board provides a development platform for the Atmel
ATmega328PB.
Key Features
• On-board debugger with full source-level debugging support in Atmel Studio
• Auto-ID for board identification in Atmel Studio
• Access to all signals on target MCU
• One green mEDBG status LED
• One yellow user LED
• One mechanical user push button
• QTouch
®
user area
• Virtual COM port (CDC)
• External target CLK 16MHz at 5V, 8MHz at 3.3V
• USB powered
• 3V3 regulator
• Arduino shield compatible foot prints
• Target SPI bus header foot print
• Xplained Pro extension headers can easily be strapped in
1.2. Design Documentation and Related Links
The most relevant documents and software for the evaluation board are available here:
Design Documentation - ZIP file containing CAD source, schematics, BOM, assembly drawings, 3D plots, layer plots, etc.
Atmel Studio - Free Atmel IDE for development of C/C++ and assembler code for Atmel microcontrollers.
Xplained - Atmel Xplained prototyping and evaluation platform.
Atmel Spaces - Open Source projects for Xplained Mini.
1.3. Xplained Mini Quick Start
How to connect the ATmega328PB Xplained Mini board embedded debugger to Atmel Studio and how to connect the ATmega328PB UART to a COM port.
1.3.1. Connect to Atmel Studio
How to connect the ATmega328PB Xplained Mini board embedded debugger to Atmel Studio to get started with SW development.
1.
Download and install Atmel Studio version 6.2 or later versions.
2.
Launch Atmel Studio.
3.
Connect the board to the USB port and it will be visible in Atmel Studio.
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1.3.2. Connect to the COM Port
How to connect the ATmega328PB UART to a COM port.
All Xplained Mini boards have an embedded debugger (mEBDG) with a number of features, among them a CDC/COM port, which enables the user to connect the ATmega328PB UART to the PC.
1.
Connect the Xplained Mini USB to the PC.
2.
A COM port named "mEDBG Virtual COM Port" will be available.
3.
Start a terminal emulator or other applications using the COM port, typical COM port settings are
9600 baud N81.
1.4. Programming and Debugging
Programming and debugging the ATmega328PB Xplained Mini.
The target micro-controller is the ATmega328PB.
The mEDBG FW is running on the ATmega32U4.
1.4.1. Programming the Target using mEDBG
Using the Embedded Debugger on the ATmega328PB Xplained Mini board to program the
ATmega328PB and setting the fuses.
1.
Connect the Xplained Mini USB to the PC.
2.
Go to Atmel Studio: click the Tools tab, select Device Programming, and select the connected mEDBG as Tool with Device as ATmega328PB and Interface to SPI, click Apply.
3.
Select "Memories" and locate the source .hex or .elf file and click Program.
4.
NOTE: If a previous debug session was not closed by selecting "Disable debugWIRE and Close" in the Debug menu, the DWEN fuse will be enabled and the target will still be in debug mode, i.e. it will not be possible to program the target using the SPI.
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5.
If the source file contains fuse settings, select "Production file" and upload the .elf file to program the fuses.
6.
Select "Fuses" to program the fuses manually. Set the fuse(s) and click "Program". Recommended fuse settings:
1.4.2. Debugging the Target using mEDBG
Using the Embedded Debugger on the ATmega328PB Xplained Mini board to debug the ATmega328PB via debugWIRE.
1.
Start Atmel Studio.
2.
Connect the Xplained Mini USB to the PC.
3.
Open your project.
4.
Click the "Project" tab and select the project "properties", click the "Tools" tab and select mEDBG as debugger and debugWIRE as interface.
5.
Click the "Debug" tab and select "Start Debugging and Break".
6.
Atmel Studio will display an error message if the DWEN fuse in the ATmega328PB is not enabled, click YES to make Studio set the fuse using the SPI interface.
7.
A debug session is started with a break in main, debugging can start.
8.
When exiting debug mode select "Disable debugWIRE and Close" in the Debug tab, this will disable the DWEN fuse.
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Important: If not exiting debug mode by selecting "Disable debugWIRE and Close" in the
Debug menu, the DWEN fuse will be enabled and the target will still be in debug mode, i.e. it will not be possible to program the target using the SPI.
Important: If any other CPU CLK than the external CLK supplied by the mEDBG is used the debugWIRE is not guaranteed to work.
Important: Applying a signal to J202/RESET (the RESET_SENSE signal) while debugging may result in unexpected behaviour. This signal is NOT available during a debugging session because the RESET line is actively used by the debugWIRE interface
1.4.3. Programming the Target using an External Programmer
How to program the target ATmega328PB using the AVR
®
JTAGICE mkII, JTAGICE3, Atmel-ICE, or other Atmel Programmers.
1.
Connect the External Programmer USB to the PC.
2.
Connect the External Programmer to the ATmega328PB Xplained Mini board SPI connector.
3.
Go to Atmel Studio: click the Tools tab, select Device Programming, and select the External
Programmer connected as Tool with Device as ATmega328PB and Interface to SPI, click Apply.
4.
Select "Memories" and locate the source .hex or .elf file and click Program.
1.4.4. Programming the ATmega32U4 using an External Programmer
How to program the ATmega32U4 using the AVR
®
JTAGICE mkII, JTAGICE3, Atmel-ICE, or other Atmel
Programmers.
1.
Connect the External Programmer USB to the PC.
2.
Connect the External Programmer to the ATmega328PB Xplained Mini board JTAG connector.
3.
Go to Atmel Studio: click the Tools tab, select Device Programming, and select the connected mEDBG as Tool with Device as ATmega32U4 and Interface to JTAG, click Apply.
4.
Select "Memories" and locate the source .hex or .elf file and click Program.
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5.
Select "Fuses" to program the fuses manually. Set the fuse(s) and click "Program". Recommended fuse settings:
1.4.5. Programming the ATmega32U4 using a Bootloader
This section describes how to use the bootloader to program the ATmega32U4.
1.
Install the Bootloader interface on the PC, download the installer from FLIP .
2.
Start the Bootloader PC GUI "FLIP".
3.
Short strap J102.
4.
Connect the ATmega328PB Xplained Mini board USB connector to the PC.
5.
Select Device = ATmega32U4 (Device - Select).
6.
Select USB communication (Ctrl+U).
7.
Select memory area to program (use the toggle memory button bellow the Atmel logo).
8.
Select Load Hex file (Ctrl+L).
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9.
Select Programming Options.
10. Click "Run", observe status in status field.
1.5. Board Assembly
The Xplained Mini board can easily be assembled into a product prototype for software development and hardware verification.
1.5.1. Custom Assembly
All signals of the ATmega328PB are available in the Xplained Mini board connector grid, enabling easy connection of external sensors and output devices in order to prototype the customer specific application.
1.5.2. Standalone Node
The ATmega328PB Xplained Mini board can be used as a standalone node with an external power source, e.g. the 4xAAA or 2xAAA battery pack available from Atmel.
1.5.3. Connecting an Arduino Shield
Arduino
®
shields can be mounted in the marked positions (J200, J201, J202, and J203) .
1.6. mEDBG Command Line Interface
The mEDBG has a command line interface enabling configuration of the mEDBG.
1.6.1. mEDBG Low Power Modes
There are two modes enabling the Xplained Mini to save power when connected to an external power source other than an USB connection.
Sleep Mode where the mEDBG is disabled. When enabled the ATmega32U4 will enter sleep mode if not enumerated within about 5sec. In this mode the external clock is not available to the target MCU.
1MHz Mode where the mEDBG/ATmega32U4 is set to run at 1MHz, saving power while maintaining the
USB connection for the COM port. The external clock will be 1MHz.
Table 1-1 Available Commands
Mode Command External CLK COM port mEDBG program mEDBG debug
Sleep
1MHz
0xFB (bit2=0)
0xFD (bit1=0)
Factory settings 0xFF disabled
1MHz
16MHz (@5V)
8MHz (@3V3) disabled enabled enabled disabled useless enabled disabled useless enabled
1.6.2. mEDBG Fuse Filter
The mEDBG does not initially allow users to program the CLK related fuses in the target. This is done to avoid problems with the debugger when the target and mEDBG is not in CLK sync. This filter can be disabled by issuing the command 0xFE ( bit0 = 0) enabling configuration of all ATmega328PB fuses.
1.6.3. How to Issue Commands
The command line interface is supported by mEDBG version 1.6 or later.
The mEDBG command line interface can be accessed with the Python script found on Atmel Spaces
Releases (mEDBG_script.zip).
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If you have Studio 7.0 (and later versions), the mEDBG included supports the command line interface, if not, the mEDBG can be downloaded from Atmel Spaces Releases (medbg_fw.zip).
Basic Python is required to run the script, Python can be downloaded from Python .
How to issue commands
1.
Install Python .
2.
Download the file "mEDBG_script.zip" from Atmel Spaces Releases .
3.
Unzip the file "mEDBG_script.zip".
4.
Edit "stuff.py" to issue the selected command "c.set_suffer(0xXX)".
5.
Open a command window in the directory where "stuff.py" is located. (Browse to the, folder rightclick on folder with shift pressed and select “Open command window here”.)
6.
Connect the Xplained Mini.
7.
Run "stuff.py" (c:\Python27\python stuff.py).
8.
The script will print the selected tool and display SUFFER setting.
9.
Recycle power (disconnect/connect the board) for the change to take effect.
10. Edit "stuff.py" to issue the command c.set_suffer(0xFF) to reset to factory setting.
How to upgrade the Xplained Mini mEDBG
1.
Start Atmel Studio.
2.
Connect the Xplained Mini to the computer.
3.
In Atmel Studio, select Tools – Device programming (Ctrl – Shift – P)
4.
In the Device Programming window, select Tool to mEDBG and click Apply. If there is a new mEDBG version available, the Atmel Studio will ask if you want to upgrade.
5.
To verify mEDBG version, click "Tool Information" when mEDBG is selected as Tool.
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2. Hardware User Guide
Enter a short description of your concept here (optional).
This is the start of your concept.
2.1. Board Overview
The ATmega328PB Xplained Mini headers overview.
.
2.2. Target Headers and Connectors
The ATmega328PB related headers.
2.2.1. Target Digital I/O
The J200 and J201 headers provide access to the ATmega328PB digital I/O pins.
Table 2-1 J200 Digital I/O High Byte Header
Function
5
6
7
J200 pin ATmega328PB pin
3
4
1
2
PB0
PB1
PB2
PB3
PB4
PB5
GND
SS, SPI Bus Master Slave select
MOSI, SPI Bus Master Output/Slave Input
MISO, SPI Bus Master Input/Slave Output
SCK, SPI Bus Master clock Input
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J200 pin ATmega328PB pin
8
9
AREF
PC4
10 PC5
Table 2-2 J201 Digital I/O High Low Header
7
8
5
6
J201 pin ATmega328PB pin
3
4
1
2
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
Function
SDA, 2-wire Serial Bus Data Input/Output Line. Shared with
ADC4
SCL, 2-wire Serial Bus Clock Line. Shared with ADC5
Function
TXD (ATmega328PB USART Output Pin)
RXD (ATmega328PB USART Input Pin)
2.2.2. Board Power Header
The J202 header enables connection to the ATmega328PB Xplained Mini power system.
Table 2-3 J202 Power Header
6
7
4
5
2
3
J202 pin Signal
1 NC
VCC_TARGET
Description
The power source selected for the target. (Select by J301)
RESET_SENSE This is a RESET signal monitored by the mEDBG, if pulled low the target RESET line will be pulled low by the mEDBG. The ATmega32U4 internal pull-up is enabled. This signal is not available during debugging.
VCC_P3V3
VCC_P5V0
GND
GND
The 3.3V regulator output
The selected power source. (VIN or VBUS selected by J300)
8 VCC_VIN The external power source connection.
.
2.2.3. Target Analogue I/O
The ATmega328PB ADC input pins are available in the J203 header.
AREF is available in J200 pin 8.
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Table 2-4 J203 Analogue Header
5
6
3
4
J203 pin ATmega328PB pin
1 PC0
2 PC1
PC2
PC3
PC4
PC5
Function
ADC Input Channel 0
ADC Input Channel 1
ADC Input Channel 2
ADC Input Channel 3
ADC Input Channel 4
ADC Input Channel 5
2.2.4. Target Programming
The J204 header enable direct connection to the SPI bus with an external programmer for programming of the ATmega328PB.
Table 2-5 SPI Header
J204 pin
1
4
5
2
3
6
ATmega328PB pin
PB4
PB5
PB3
PC6
Function
MISO
VCC target
SCK
MOSI
RESET
GND
2.2.5. Target Additional I/O
Signals not available in any of the headers or connectors, are available in column 5 of the grid.
Table 2-6 Additional I/O
ATmega328PB pin
PE0
PE1
PE2
PE3
Grid position
J5
I5
H5
G5
2.3. Target GUI
The ATmega328PB Xplained Mini has One LED, one push button, and a QTouch area.
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2.3.1. Push Button
A general purpose push button, SW200, is connected to PB7.
2.3.2. User LED
There is one yellow LED, D200, available for use by the application SW.
The LED is connected to ATmega328PB pin 17 - PB5 and to the SPI bus SCK signal for, SCK is in 3state when not used by the mEDBG.
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2.3.3. QTouch buttons
Up to 4 QTouch buttons are available on the ATmega328PB Xplained Mini board. The QTouch area can be configured as buttons or as a limited slider. For a typical button or slider reference design use the QT1
Xplained Pro extension.
Tip: There is a range of QTouch reference designs demonstrated with the QT Xplained Pro extensions located at
Xplained - Atmel Xplained prototyping and evaluation platform.
Table 2-7 QTouch Buttons Wiring
Button ATmega328PB
R
S
A
V
PE2 via 100k.
PE3 via 100k.
PC3 via 100k.
Connected via 0Ω to A enabling slider configuration.
PTC
Y6
Y7
Y3
In the default HW configuration the QTouch area can be configured in SW as 3 buttons or as a limited slider.
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.
To get 4 buttons the S touch area can be connected to e.g. PC2 by removing the 0Ω resistor R214 and adding a wire or a 100k resistor from PC2 (D1) to the test point in B5.5.
2.4. On-board Power Supply
The ATmega328PB Xplained Mini board has an on-board 3.3V regulator (150mA) which can be used to power the ATmega328PB.
The J300 and J301 headers configure the ATmega328PB power supply and the board power source.
The default configuration is set by R300 and R301 0Ω resistors which can be easily removed to change the default configuration.
Table 2-8 Board Power Options
Mode J301 connection, target
J300 connection, board
Function
5V (Default) pin2 connected to pin1 pin2 connected to pin1 Board and target powered by VBUS
3.3V USB pin2 connected to pin3, remove R301
VIN pin2 connected to pin1 Target powered by 3.3V and USB pin2 connected to pin1 pin2 connected to pin3, remove R300 interface powered by VBUS
Board and target powered by VIN,
J202.8. 1.8V < VIN < 5.5V
3.3V VIN pin2 connected to pin3, remove R301 pin2 connected to pin3, remove R300
Target powered by 3.3V. VIN as regulator input. 4V < VIN < 16V
Tip: Use the BOD LEVEL fuse to avoid the following challenges:
For the CPU to successfully decode and execute instructions, the supplied voltage must always stay above the minimum voltage level set by the chosen operating frequency.
When supplied voltage drops below this level, the CPU may start to execute some instructions incorrectly. The result is unexpected activity on the internal data and control lines.
This activity may cause CPU Registers, I/O Registers and Data Memories to get corrupted.
To avoid these problems, the CPU should be prevented from executing code during periods of insufficient supply voltage.
2.5. mEDBG
The ATmega328PB Xplained Mini board has an embedded debugger/programmer enabling debugging and programming of the ATmega328PB without any additional external equipment.
2.5.1. mEDBG Status LED
The mEDBG has a green status LED connected to ATmega32U4 PC6 to signal the embedded debugger state.
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Table 2-9 mEDBG Green Status LED Function mEDBG state
Enumeration
Programming
Debugging
LED
ON
ON
ON
Function
During the initial USB connection process the LED is on until enumerated or if not enumerated it is turned off within about 5 seconds
The LED is on during programming
The LED is on when the debugger is running
2.5.2. mEDBG External Clock
The mEDBG (ATmega32U4) clock out signal (PC7) is connected to the ATmega328PB external clock input signal and can be used as the system clock source. The External Clock frequency is 16MHz when the target is running at 5V and 8MHz when running at 3V3.
Tip: The External Clock can be set to 1MHz to save power using the mEDBG command line interface.
Tip: There is a test point marked EXT.CLK enabling easy measuring and/or connection to the
CLK signal.
2.5.3. mEDBG COM Port Connection
The mEDBG provide a CDC COM port connection when connected to a USB host device.
The mEDBG (ATmega32U4) USART is used for communication with the CDC COM port. The USART
TX/RX signals are available on the J104 header and are also connected to the ATmega328PB via 0Ω resistors enabling easy disconnect from the ATmega328PB if needed.
Table 2-10 J104 USART Header
J104 pin ATmega32U4 ATmega328PB
1 - USART TxD PD3 PD1
2 - USART RxD PD2 PD0
Function
TxD out from ATmega32U4
RxD in to ATmega32U4
2.5.4. mEDBG JTAG Interface
The mEDBG (ATmega32U4) JTAG interface is available for programming and debugging of the
ATmega32U4.
Table 2-11 J100 JTAG Header
Description
2
3
4
J100 pin Signal name
1 TCK
GND
TDO
VCC_BOARD ATmega32U4 V
CC
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J100 pin Signal name
7
8
5
6
9
10
TMS
RESET
NC
NC
TDI
GND
Description
Connected to ATmega32U4 only
2.5.5. mEDBG USB Interface
J101 is a Micro-B USB connector connected to the embedded debugger (ATmega32U4).
Table 2-12 J101 USB Header
4
5
2
3
J101 pin Signal name
1 VBUS
D-
D+
NC
GND
The VBUS has a resettable PTC fuse (F100), with a hold current of 0.5A and a trip current of 1.0A to protect the USB host device.
2.6. Extension Header Area
The marked area on the grid I7 to R8 can be used for strapping in an Xplained Pro extension header or a
10-pin Xplained/RZ600 header.
The SPI bus signals are made available close to the header at row J and K, enabling easy connection to header pin 15 to 18.
Using Pin 11 to 20 enables connection of the 10-pin connector used on the RZ600 wireless modules and the 10-pin Xplained sensor modules.
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The general bus connections for an Xplained PRO Extension board is indicated in the table below, detailed wiring can be found in the selected extension board documentation.
Table 2-13 Extension Header Typical Signals
17
18
19
20
11
12
13
14
15
16
7
8
9
10
5
6
3
4
Pin Signal name
1 ID
2 GND
ADC(+)
ADC(-)
GPIO1
GPIO2
PWM(+)
PWM(-)
IRQ/GPIO
SPI_SS_B/
GPIO
I2C_SDA
I2C_SCL
UART_RX
UART_TX
SPI_SS_A
SPI_MOSI
SPI_MISO
SPI_SCK
GND
VCC
Signal description
Communication line to the ID chip on the Xplained extension board
Ground
Analog to digital converter, alternatively positive part of differential ADC
Analog to digital converter, alternatively negative part of differential ADC
General purpose I/O
General purpose I/O
Pulse width modulation, alternatively positive part of differential PWM
Pulse width modulation, alternatively negative part of differential PWM
Interrupt request line and/or general purpose I/O
Slave B select for SPI and/or general purpose I/O
Data line for I
2
Clock line for I
C interface
2
C interface
Receiver line of ATmega328PB USART
Transmitter line of ATmega328PB USART
Slave A select for SPI
Master out slave in line of serial peripheral interface
Master in slave out line of serial peripheral interface
Clock for serial peripheral interface
Ground
Power for extension board
2.7. Factory Programmed
The ATmega328PB is preprogrammed with a demo program, ReMorse.
Source code is available in Atmel Spaces .
When the CDC COM port is connected to a terminal window (9600 N81), the text you write will be transmitted via the LED in Morse code. Any Morse code transmitted by using the switch will be displayed as text in the terminal window.
The ATmega32U4 is preprogrammed with the mEDBG.
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2.8. Document Revision History
Document revision
42469A
Date
07/2015
Comment
Initial document release
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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
©
2015 Atmel Corporation. / Rev.: Atmel-42469A-ATmega328PB-Xplained-Mini_User Guide-07/2015
Atmel
®
, Atmel logo and combinations thereof, Enabling Unlimited Possibilities
®
, AVR
®
, QTouch
®
, and others are registered trademarks or trademarks of Atmel
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