Atmel ATmega168 Manual de usuario

42250A-MCU-02/2014

USER GUIDE

ATmega168 Xplained Mini User Guide

Introduction

This user guide describes how to get started with the Atmel® ATmega168

Xplained Mini board.

The ATmega168 Xplained Mini evalutation kit is a hardware platform to evaluate

the Atmel ATmega168 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 ATmega168

enabling easy integration of the device in a custom design

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

Table of Contents

Introduction .................................................................................... 1

1. Getting Started ........................................................................ 3

1.1. Features .............................................................................. 3

1.2. Design Documentation and Related Links .................................. 3

1.3. Board Assembly .................................................................... 3

1.3.1. In Customer Development Assembly ............................. 3

1.3.2. Connecting an Arduino Shield ..................................... 3

1.3.3. Standalone Node ...................................................... 3

1.4. Connecting the Kit ................................................................. 3

1.4.1. Atmel Studio ............................................................ 3

1.4.2. Connect the ATmega168 UART to the mEBDG COM

Port ........................................................................ 3

1.5. Programming and Debugging .................................................. 3

1.5.1. Programming the Target Using mEDBG ......................... 3

1.5.2. Debugging the Target Using mEDBG ............................ 4

1.5.3. Programming the Target Using an External

Programmer ............................................................. 4

1.5.4. Programming the ATmega32U4 Using an External

Programmer ............................................................. 5

1.5.5. Bootloader ............................................................... 5

1.5.6. How to Install the "Bootloader PC tool" .......................... 6

1.6. Available Example Code ......................................................... 9

2. Hardware User Guide ........................................................... 10

2.1. Board Overview .................................................................. 10

2.2. Clock Distribution ................................................................. 10

2.3. Headers and Connectors ...................................................... 10

2.3.1. JTAG (J100) ........................................................... 10

2.3.2. USB (J101) ............................................................ 11

2.3.3. USART (J102) ........................................................ 11

2.3.4. ATmega168 Digital I/O (J200 and J201) ....................... 11

2.3.5. ATmega168 Analogue I/O (J203) ................................ 12

2.3.6. Power (J202) .......................................................... 12

2.3.7. ATmega168 ISP (J204) ............................................ 12

2.4. Board GUI .......................................................................... 13

2.4.1. LEDs ..................................................................... 13

2.4.2. Button ................................................................... 13

2.5. Factory Programmed Data .................................................... 13

3. Document Revision History ................................................... 14

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

1. Getting Started

1.1 Features

The ATmega168 Xplained Mini evaluation board provides a development platform for the Atmel ATmega168.

1.2 Design Documentation and Related Links

The most relevant documents and software for the evaluation board.1

1.3 Board Assembly

The Xplained Mini board is very flexible and can be used in a number of ways. E.g. as your own prototype for

SW development and HW verification.

1.3.1 In Customer Development Assembly

The ATmega168 Xplained Mini board can be wired into the customer prototype assembly by using the on-

board connector grid, where most target signals are available.

1.3.2 Connecting an Arduino Shield

By assembling receptacles in the marked positions Arduino® shields can be mounted.

1.3.3 Standalone Node

The ATmega168 Xplained Mini board can be used as a standalone node - use the 4xAAA battery pack

available in Atmel store to provide power.

1.4 Connecting the Kit

How to connect the evaluation board.

1.4.1 Atmel Studio

How to connect the ATmega168 Xplained Mini board assembly to Atmel Studio.

1. Download and install Atmel Studio2 version 6.2 or newer.

2. Launch Atmel Studio.

3. Connect the board to the USB port and it will be visible in Atmel Studio.

1.4.2 Connect the ATmega168 UART to the mEBDG 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 ATmega168 UART to the PC.

1. Connect the mEDBG USB to the PC.

2. Use the Device Manager to find the COM port number.

3. Default COM port settings are 9600baud N81. The COM port settings can be changed using the Device

Manager.

1.5 Programming and Debugging

How to program and debug the Xplained Mini board.

1.5.1 Programming the Target Using mEDBG

Using the Embedded Debugger on the Xplained Mini board to program the ATmeag168 via the SPI bus.

1 http://www.atmel.com/tools/XplainedMini.aspx

2 http://www.atmel.com/tools/atmelstudio.aspx

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

1. Connect the mEDBG USB to the PC.

2. Go to Atmel Studio: Tools/Device Programming, and select the connected mEDBG as Tool with Device

= ATmega168PA and Interface = ISP, click Apply. Note that if ISP programming fails it could be because

debugWIRE is enabled. See debugging chapter on how to disable debugWIRE mode: “Debugging the

Target Using mEDBG” on page 4.

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

4. If the source contains fuse settings go to "Production file" and upload the elf file and program the fuses.

5. To set fuses manually click Fuses and select the setting.

Recommended fuse setting:

BOOTSZ = 1024W_1C00, BOOTRST = [ ], RSTDISBL = [ ], DWEN = [ ], SPIEN = [X], WDTON

= [ ], EESAVE = [ ], BODLEVEL = DISABLE, CKDIV8 = [ ], CKOUT = [ ], SUT_CKSEL =

EXTCLK_6CK_14CK_65MS

Important If any other cpu clk than the external clk supplied by the mEDBG is used the debugWIRE is

not guaranteed to work.

The mEDBG will prevent writing certain fuse combinations in order to protect your kit.

1.5.2 Debugging the Target Using mEDBG

Using the Embedded Debugger on the Xplained Mini board to debug the ATmega168 via debugWIRE.

1. Start Atmel Studio.

2. Connect the mEDBG USB to the PC.

3. Open your project.

4. In the Project menu select the project properties page, select the Tools tab and select mEDBG as

debugger and debugWIRE as interface.

5. In the Debug menu click Start Debugging and Break.

6. Atmel Studio will display an error message if the DWEN fuse in the ATmega168 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, debugging can start.

8. When exiting debug mode select "Disable debugWIRE and Close" in the Debug menu, this will disable the

DWEN fuse.

Important If any other cpu clk than the external clk supplied by the mEDBG is used the debugWIRE is not

guaranteed to work.

1.5.3 Programming the Target Using an External Programmer

How to program the target ATmega168 using the AVR® JTAGICE mkII, JTAGICE3, or other Atmel

Programmers.

1. Connect the External Programmer to the PC.

2. Connect the External Programme to the evaluation board connector (J204) (Need the 6-pin 100mil adapter

connected to the JTAGICE).

3. Go to Atmel Studio: Tools/Device Programming, and select the External Programmer connected as Tool,

Select Device = ATmega168PA, Interface = ISP and click Apply.

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

5. If the source contains fuse settings go to "Production file" and upload the elf file and program the fuses.

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

Recommended fuse setting:

BOOTSZ = 1024W_1C00, BOOTRST = [ ], RSTDISBL = [ ], DWEN = [ ], SPIEN = [X], WDTON

= [ ], EESAVE = [ ], BODLEVEL = DISABLE, CKDIV8 = [ ], CKOUT = [ ], SUT_CKSEL =

EXTCLK_6CK_14CK_65MS

1.5.4 Programming the ATmega32U4 Using an External Programmer

How to program the ATmega32U4 using the AVR® JTAGICE mkII, JTAGICE3, or other Atmel Programmers.

To restore the mEDBG FW use the /tools/mEDBG/mEDBG_fw.zip from the Studio installation.

1. Connect the External Programme to the PC.

2. Connect the External Programme to the board connector (J100).

3. Go to Atmel Studio: Tools/Device Programming, and select the External Programme connected as Tool,

select Device = ATmega32U4, Interface = JTAG and click Apply.

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

5. If the source contain fuse settings go to "Production file" and upload the elf file and program the fuses.

Recommended fuse setting:

BODLEVEL = 3V5

HWBE = [X]

OCDEN = [ ]

JTAGEN = [X]

SPIEN = [X]

WDTON = [ ]

EESAVE = [X]

BOOTSZ = 2048W_3800

BOOTRST = [ ]

CKDIV8 = [ ]

CKOUT = [X]

SUT_CKSEL = EXTXOSC_8MHZ_XX_258CK_65MS

Important CKOUT must be enabled the provide clock to the target.

1.5.5 Bootloader

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

1. Install the Bootloader interface on the PC as described in “How to Install the "Bootloader PC

tool"” on page 6.

2. Start the Bootloader PC GUI "FLIP".

3. Short strap J102.

Insert the USB stick in the PC.

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

5. Select USB communication (Ctrl+U).

6. Select memory area to program (Use the toggle memory button bellow the Atmel logo).

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

8. Select Programming Options.

9. Click "Run", observe status in status field.

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

1.5.6 How to Install the "Bootloader PC tool"

How to install the Bootloader PC GUI tool,

1. Download the Flip "in system programming tool" installer from http://www.atmel.com/tools/FLIP.aspx3.

2. Run the Flip Installer.

3 http://www.atmel.com/tools/FLIP.aspx

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

3. Download the Atmel USB extension and run the installer.

4. Start Flip - if the USB stick is not recognized continue with step 5.

5. Update the USB DFU driver.

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

Clik the Update Driver button and select "Browse my computer-..."

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

1.6 Available Example Code

The ATmega168 is preprogrammed with a demo program, ReMorse. Source code is available in Atmel

Spaces4.

When the CDC COM port is connected to a terminal window, 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.

4 http://spaces.atmel.com/gf/

ATmega168 Xplained Mini User Guide [USER GUIDE]

42250A-MCU-02/2014

2. Hardware User Guide

2.1 Board Overview

Figure 2-1. ATmega168XMINIoverview.png

2.2 Clock Distribution

The ATmega32U4 (mEDBG) has an external 16MHz XTAL.

The ATmega32U4 provides an external 16MHz clock to the ATmega168 (target).

2.3 Headers and Connectors

The board connectors.

2.3.1 JTAG (J100)

J100 is the JTAG programming header typically used by the JTAGICE for programming of the ATmega32U4

(mEDBG).

Table 2-1. JTAG

J100 pin Signal function

1 JTAG_TCK

Tabla de contenidos

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