Atmel ATmega168PB Xplained Mini Manuale utente

42381A-MCU-10/2014

USER GUIDE

ATmega168PB Xplained Mini User Guide

Introduction

This user guide describes how to get started with the Atmel® ATmega168PB

Xplained Mini board.

The ATmega168PB Xplained Mini evaluation kit is a hardware platform to

evaluate the Atmel ATmega168PB 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

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

ATmega168PB Xplained Mini User Guide [USER GUIDE]

42381A-MCU-10/2014

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. Connect the Kit to Atmel Studio ................................... 3

1.4.2. Connect the Target UART to the mEBDG COM Port ......... 3

1.5. Programming and Debugging .................................................. 4

1.5.1. Programming the Target Using mEDBG ........................ 4

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

1.5.3. Programming the Target Using an External

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

1.5.4. Programming the ATmega32U4 Using an External

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

1.5.5. Programming the ATmega32U4 Using a Bootloader ......... 6

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

1.6. Available Example Code ......................................................... 7

2. Hardware User Guide ............................................................. 9

2.1. Board Overview .................................................................... 9

2.2. Clock Distribution .................................................................. 9

2.3. Headers and Connectors ........................................................ 9

2.3.1. JTAG (J100) ............................................................ 9

2.3.2. USB (J101) ............................................................ 10

2.3.3. USART (J104) ........................................................ 10

2.3.4. Target Digital I/O (J200 and J201) .............................. 10

2.3.5. Target Analogue I/O (J203) ....................................... 11

2.3.6. Power (J202, J300, J301) ......................................... 11

2.3.7. Target SPI (J204) .................................................... 12

2.3.8. Additional Target Signals .......................................... 12

2.3.9. Extension Headers .................................................. 13

2.4. Board GUI .......................................................................... 14

2.4.1. LEDs ..................................................................... 14

2.4.2. Button ................................................................... 14

2.5. Factory Programmed Data .................................................... 15

3. Document Revision History ................................................... 16

ATmega168PB Xplained Mini User Guide [USER GUIDE]

42381A-MCU-10/2014

1. Getting Started

1.1 Features

The ATmega168PB Xplained Mini evaluation board provides a development platform for the Atmel

ATmega168PB.

1.2 Design Documentation and Related Links

The most relevant documents and software for the evaluation board is available here:

http://www.atmel.com/tools/MEGA168PB-XMINI.aspx

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 ATmega168PB Xplained Mini board can be wired into the customer prototype assembly by using the on-

board connector grid, where the target signals are available.

1.3.2 Connecting an Arduino Shield

By assembling receptacles in the marked positions (J200, J201, J202, and J203) Arduino® shields can be

mounted.

1.3.3 Standalone Node

The ATmega168PB Xplained Mini board can be used as a standalone node - use the 4xAAA or 2xAAA battery

pack available in Atmel store to provide power.

1.4 Connecting the Kit

How to connect the evaluation board.

1.4.1 Connect the Kit to Atmel Studio

How to connect the ATmega168PB Xplained Mini board to Atmel Studio.

1. Download and install Atmel Studio1 version 6.2 or later.

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 Target 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 ATmega168PB 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 http://www.atmel.com/tools/atmelstudio.aspx

ATmega168PB Xplained Mini User Guide [USER GUIDE]

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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 ATmega328 via the SPI bus.

1. Connect the mEDBG USB to the PC.

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

with Device = ATmega168PB 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

Note 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.

Trying to change CKDIV8 and/or SUT_CKSEL will be prevented and an Error message will

be displayed ("One or more registers differs").

To be able to set fuses freely the ATmega32U4 EEPROM has to be programmed to 0x00

from address 0x200 to 0x214.

Note 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.

1.5.2 Debugging the Target Using mEDBG

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

ATmega168PB Xplained Mini User Guide [USER GUIDE]

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5. In the Debug menu click 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, debugging can start.

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

DWEN fuse.

Note 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.

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

guaranteed to work.

Note 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.

1.5.3 Programming the Target Using an External Programmer

How to program the target ATmega168PB 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 ISP 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 = ATmega168PB, 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.

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.

ATmega168PB Xplained Mini User Guide [USER GUIDE]

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1. Connect the External Programmer to the PC.

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

3. Go to Atmel Studio: Tools/Device Programming, and select the External Programmer 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 = DISABLE

HWBE = [X]

OCDEN = [ ]

JTAGEN = [X]

SPIEN = [X]

WDTON = [ ]

EESAVE = [X]

BOOTSZ = 2048W_3800

BOOTRST = [ ]

CKDIV8 = [ ]

CKOUT = [X]

SUT_CKSEL = EXTXOSC_8MHZ_XX_258CK_65MS

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

1.5.5 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 as described in “How to Install the "Bootloader PC

tool"” on page 6.

2. Start the Bootloader PC GUI "FLIP".

3. Short strap J102.

4. Connect the 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).

9. Select Programming Options.

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

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.aspx2.

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

ATmega168PB Xplained Mini User Guide [USER GUIDE]

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2. Run the FLIP Installer.

1.6 Available Example Code

The ATmega168PB is preprogrammed with a demo program, ReMorse. Source code is available in Atmel

Spaces3.

When the CDC COM port is connected to a terminal window, the text you write will be transmitted via the LED

in Morse code.

3 http://spaces.atmel.com/gf/project/avr_xp_mini/

ATmega168PB Xplained Mini User Guide [USER GUIDE]

42381A-MCU-10/2014

Any Morse code transmitted by using the switch will be displayed as text in the terminal window.

ATmega168PB Xplained Mini User Guide [USER GUIDE]

42381A-MCU-10/2014

2. Hardware User Guide

2.1 Board Overview

Figure 2-1. ATmega168PB-XMINI Overview

2.2 Clock Distribution

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

The ATmega32U4 provides an external 16MHz clock to the ATmega168PB (target).

2.3 Headers and Connectors

The board headers and 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. J100 JTAG Header

J100 pin Signal function

1 JTAG_TCK

ATmega168PB Xplained Mini User Guide [USER GUIDE]

42381A-MCU-10/2014

J100 pin Signal function

2 GND

3 JTAG_TDO

4 VCC (5V0)

5 JTAG_TMS

6 RESET

7 NC

8 NC

9 JTAG_TDI

10 GND

2.3.2 USB (J101)

J101 is a Micro-B USB connector connected to the embedded debugger (ATmega32U4).

Table 2-2. J101 USB Connector

J101 pin Function

1 VBUS

2 D-

3 D+

4 NC

5 GND

2.3.3 USART (J104)

The ATmega32U4 USART signals are available on J104 USART header.

The mEDBG CDC COM port is connected to these signals.

Table 2-3. J104 USART Header

J104 pin ATmega32U4 ATmega168PB Function

1 - UART TXD PD3 PD1 TxD from ATmega32U4.

2 - UART RXD PD2 PD0 RxD to ATmega32U4.

2.3.4 Target Digital I/O (J200 and J201)

The J200 and J201 headers provide access to ATmega168PB digital I/O pins.

Table 2-4. J200 I/O High Header

J200 pin ATmega168PB pin Note

J200-1 PB0

J200-2 PB1

J200-3 PB2

J200-4 PB3

J200-5 PB4

J200-6 PB5/SCK Yellow USER LED D200 connected.

J200-7 GND

J200-8 AREF

J200-9 PC4/SDA TWI Serial Data.

J200-10 PC5/SCL TWI Serial Clock.

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