Microchip Technology ATMEGA168PB-XMINI Manuel utilisateur

ATmega168PB Xplained Mini

Preface

This user guide describes how to get started with the ATmega168PB Xplained Mini evaluation kit. The

evaluation kit is a hardware platform to evaluate the ATmega168PB microcontroller. The on-board mini

embedded debugger provides seamless integration with Atmel Studio. The kit provides access to the

features of the ATmega168PB enabling easy integration of the device in a custom design.

Table of Contents

Preface............................................................................................................................ 1

1. Introduction................................................................................................................4

1.1. Features....................................................................................................................................... 4

1.2. Board Overview............................................................................................................................4

2. Getting Started.......................................................................................................... 6

2.1. Xplained Mini Quick Start............................................................................................................. 6

2.2. Design Documentation and Related Links................................................................................... 6

2.3. Programming and Debugging...................................................................................................... 6

2.3.1. Programming the Target Using mEDBG........................................................................6

2.3.2. Debugging the Target Using mEDBG............................................................................8

2.3.3. Programming the Target Using an External Programmer..............................................9

2.3.4. Programming the ATmega32U4 Using an External Programmer..................................9

2.3.5. Programming the ATmega32U4 Using a Bootloader...................................................10

3. Xplained Mini........................................................................................................... 11

3.1. Mini Embedded Debugger..........................................................................................................11

3.1.1. Xplained Mini Clock Output..........................................................................................11

3.2. mEDBG Configuration................................................................................................................12

3.2.1. mEDBG Low Power Modes.........................................................................................12

3.2.2. mEDBG Fuse Filter......................................................................................................12

3.2.3. mEDBG Command Line Interface............................................................................... 13

3.2.4. Super User Fantastic Feature Enable Register........................................................... 13

3.3. mEDBG Firmware Upgrade and Manual Bootloader Entry........................................................14

4. Hardware User Guide..............................................................................................15

4.1. Power Sources...........................................................................................................................16

4.2. Board Assembly......................................................................................................................... 17

4.2.1. Connecting an Arduino Shield..................................................................................... 17

4.3. Target Headers and Connectors................................................................................................ 17

4.3.1. Target Digital I/O.......................................................................................................... 17

4.3.2. Board Power Header................................................................................................... 18

4.3.3. Target Analogue I/O.....................................................................................................19

4.3.4. Target Programming.................................................................................................... 19

4.3.5. Target Additional I/O.................................................................................................... 19

4.4. Target Peripherals...................................................................................................................... 20

4.4.1. Push Button................................................................................................................. 20

4.4.2. User LED..................................................................................................................... 20

4.5. mEDBG...................................................................................................................................... 21

4.5.1. mEDBG COM Port Connection................................................................................... 21

4.5.2. mEDBG JTAG Interface...............................................................................................21

4.6. Extension Header Area.............................................................................................................. 22

4.7. Factory Programmed..................................................................................................................23

ATmega168PB Xplained Mini

5. Hardware Revision History and Known Issues........................................................24

5.1. Identifying Product ID and Revision........................................................................................... 24

5.2. Revision 5...................................................................................................................................24

6. Document Revision History..................................................................................... 25

The Microchip Web Site................................................................................................ 26

Customer Change Notification Service..........................................................................26

Customer Support......................................................................................................... 26

Microchip Devices Code Protection Feature................................................................. 26

Legal Notice...................................................................................................................27

Trademarks................................................................................................................... 27

Quality Management System Certified by DNV.............................................................28

Worldwide Sales and Service........................................................................................29

ATmega168PB Xplained Mini

1. Introduction

1.1 Features

The ATmega168PB Xplained Mini evaluation kit provides a development platform for the ATmega168PB.

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 the target MCU

• One green mEDBG status LED

• One yellow user LED

• One mechanical user push button

• Virtual COM port (CDC)

• External target CLK 16MHz at 5V, 8MHz at 3.3V

• USB powered

• 3.3V regulator

• Arduino shield compatible footprints

• Target SPI bus header footprint

• Xplained Pro extension headers can easily be strapped in

1.2 Board Overview

A brief overview of the default kit configuration, headers, and connectors.

ATmega168PB Xplained Mini

Figure 1-1. ATmega168PB Xplained Mini Headers and Connectors

Digital I/O Low (J201)

Digital I/O Hi gh (J200)

Power (J202)

Analog I/O (J203)

PC4

PC5

ATmega168PB

Power

Ground

Target I/O

Shared I/Os

PC3

PC2

PC1

PC0

VIN

GND

3V3

RESET

VCC

PD0

PD1

PD2

PD3

PD4

PD5

GND

PD6

PD7

PB0

PB1

PB2

PB3

PB4

PB5

AREF

PC4

PC5

LED / ISP (J204)

CDC TX

CDC RX

External

Clock

SPI

(J204)

CDC UART

(J104)

mEDBG

(ATmega32U4)

Power source

(J300)

Micro USB

Con nector

Target power

(J301)

Status

LED

PB5PB7

User

LED

User

button

ISP (J204)

ANALOG (J203)

DIGITAL J200

Table 1-1. Default Configurations

Function Default configuration Other settings

Kit power source (J300) 5.0V USB powered External input VIN (1)

Target power (J301) 5.0V USB powered 3.3V from the on-board regulator

(1)

ATmega168PB clock 16MHz mEDBG clock (2)Internal oscillator (3)

Info:

Changing the default settings require modification of the kit using a soldering iron.

1) Details on how to change the power settings are described in Power Sources.

2) Details on the mEDBG clock are described in Xplained Mini Clock Output.

3) Debugging through debugWIRE may be disabled if the internal oscillator is used.

ATmega168PB Xplained Mini

2. Getting Started

2.1 Xplained Mini Quick Start

Steps to start exploring the Xplained Mini platform:

1. Download Atmel Studio.

2. Launch Atmel Studio.

3. Connect a USB cable (Standard-A to Micro-B or Micro-AB) between the PC and the USB port on

the kit.

When the Xplained Mini kit is connected to your computer for the first time, the operating system will

perform a driver software installation. The driver file supports both 32- and 64-bit versions of Microsoft®

Windows® XP, Windows Vista®, Windows 7, Windows 8, and Windows 10. The drivers for the kit are

included with the Atmel Studio.

Once the Xplained Mini board is powered the green status LED will blink and Atmel Studio will autodetect

which Xplained Mini board is connected. Atmel Studio will present relevant information like data sheets

and kit documentation. The ATmega168PB device is programmed and debugged by the on-board Mini

Embedded Debugger and therefore no external programmer or debugger tool is required.

2.2 Design Documentation and Related Links

The most relevant documents and software for the evaluation kit are available here:

ATmega168PB Xplained Mini website - Kit information, latest user guide, and design documentation.

ATmega168PB Xplained Mini on Microchip Direct - Buy this kit on microchipDIRECT.

•Atmel Studio - Free IDE for the development of C/C++ and assembler code for microcontrollers.

•Xplained products - Xplained evaluation kits are a series of easy-to-use evaluation kits for

Microchip microcontrollers and other Microchip products.

– Xplained Nano: used for low pin-count devices and provides a minimalistic solution with

access to all I/O pins of the target microcontroller.

– Xplained Mini: used for medium pin-count devices and adds Arduino Uno compatible header

footprint and a prototyping area.

– Xplained Pro: used for medium to high pin-count devices that features advanced debugging

and standardized extensions for peripheral functions.

Note: All the above kits have on-board programmers/debuggers, which creates a set of low-cost

boards for evaluation and demonstration of features and capabilities of different Microchip products.

•Atmel Spaces - Open Source projects for Xplained Mini.

•http://start.atmel.com/ - Atmel START is an online tool to help you select and configure software

components and tailor your embedded application in a usable and optimized manner.

2.3 Programming and Debugging

2.3.1 Programming the Target Using mEDBG

Using the Embedded Debugger on the ATmega168PB Xplained Mini board to program the

ATmega168PB.

ATmega168PB Xplained Mini

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 ATmega168PB and Interface to ISP, click Apply.

3. Select "Memories", 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 ISP interface.

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:

ATmega168PB Xplained Mini

2.3.2 Debugging the Target Using mEDBG

Using the Embedded Debugger on the ATmega168PB Xplained Mini board to debug the ATmega168PB

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 ATmega168PB is not enabled,

click YES to make Studio set the fuse using the ISP interface.

7. A debug session is started with a break in main, the debugging can start.

8. To exit debug mode, select "Disable debugWIRE and Close" in the Debug tab. This will disable the

DWEN fuse.

ATmega168PB Xplained Mini

Info:

If debug mode is not exited 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 ISP.

If any other CPU CLK than the external CLK supplied by the mEDBG is used, the debugWIRE

is not guaranteed to work.

Applying a signal to J202/RESET (the RESET_SENSE signal) while debugging may result in

unexpected behavior. This signal is NOT available during a debugging session because the

RESET line is actively used by the debugWIRE interface.

2.3.3 Programming the Target Using an External Programmer

How to program the target ATmega168PB using the AVR® JTAGICE mkII, JTAGICE3, Atmel-ICE, or other

programmers.

1. Connect the External Programmer USB to the PC.

2. Connect the External Programmer to the ATmega168PB Xplained Mini board ISP connector.

3. Go to Atmel Studio: Click the Tools tab, select Device Programming, and select the External

Programmer connected as Tool with Device as ATmega168PB and Interface to ISP, click Apply.

4. Select "Memories", locate the source .hex or .elf file, and click Program.

2.3.4 Programming the ATmega32U4 Using an External Programmer

How to program the ATmega32U4 using the AVR JTAGICE mkII, JTAGICE3, Atmel-ICE, or other

programmers.

1. Connect the External Programmer USB to the PC.

2. Connect the External Programmer to the ATmega168PB 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", locate the source .hex or .elf file, and click Program.

5. Select "Fuses" to program the fuses manually. Set the fuse(s) and click "Program". Recommended

fuse settings:

ATmega168PB Xplained Mini

Warning: Changing the firmware in the ATmega32U4 will remove the programming and

debugging capabilities of the mEDBG. If the EEPROM is altered the mEDBG may not be

recognized by Atmel Studio anymore.

2.3.5 Programming the ATmega32U4 Using a Bootloader

This section describes how to use the bootloader to program the ATmega32U4.

1. Launch Atmel Studio.

2. Short strap J102.

3. Open the programming dialog, select the bootloader in the tool menu.

4. Connect the ATmega168PB Xplained Mini board USB connector to the PC.

5. Select Device = ATmega32U4 (Device - Select).

6. Select USB communication (Ctrl+U).

7. Select the memory area to program (use the toggle memory button).

8. Select Load Hex file (Ctrl+L).

9. Select Programming Options.

10. Click "Run", observe the status in the status field.

Warning: Changing the firmware in the ATmega32U4 will remove the programming and

debugging capabilities of the mEDBG. If the EEPROM is altered the mEDBG may not be

recognized by Atmel Studio anymore.

ATmega168PB Xplained Mini

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