Microchip Technology ATtiny817 Xplained Pro Manuale utente

ATtiny817 Xplained Mini

Preface

The ATtiny817 Xplained Mini evaluation kit is a hardware platform to evaluate the ATtiny817 microcontroller.

Supported by the Atmel Studio and MPLAB® X integrated development platform, the kit provides easy access to the

features of the ATtiny817 and explains how to integrate the device into a custom design.

The Xplained Mini series evaluation kits include an on-board mini embedded debugger. No external tools are

necessary to program the ATtiny817.

Table of Contents

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

1. Introduction............................................................................................................................................. 3

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

1.2. Kit Overview................................................................................................................................. 3

2. Getting Started........................................................................................................................................ 5

2.1. Xplained Mini Quick Start............................................................................................................. 5

2.2. Design Documentation and Relevant Links................................................................................. 5

3. Xplained Mini...........................................................................................................................................6

3.1. Mini Embedded Debugger............................................................................................................6

3.2. mEDBG Configuration..................................................................................................................7

3.3. mEDBG Firmware Upgrade and Manual Bootloader Entry..........................................................9

4. Hardware User Guide........................................................................................................................... 10

4.1. Power Sources........................................................................................................................... 12

4.2. Connectors.................................................................................................................................12

4.3. Current Measurement................................................................................................................ 15

4.4. Disconnecting mEDBG...............................................................................................................16

4.5. Peripherals................................................................................................................................. 17

4.6. Embedded Debugger Implementation........................................................................................18

5. Hardware Revision History and Known Issues..................................................................................... 19

5.1. Identifying Product ID and Revision........................................................................................... 19

5.2. Revision 6...................................................................................................................................19

5.3. Revision 5...................................................................................................................................19

5.4. Revision 4...................................................................................................................................19

6. Document Revision History...................................................................................................................20

The Microchip Website.................................................................................................................................21

Product Change Notification Service............................................................................................................21

Customer Support........................................................................................................................................ 21

Microchip Devices Code Protection Feature................................................................................................ 21

Legal Notice................................................................................................................................................. 21

Trademarks.................................................................................................................................................. 22

Quality Management System....................................................................................................................... 22

Worldwide Sales and Service.......................................................................................................................23

ATtiny817 Xplained Mini

1. Introduction

1.1 Features

• ATtiny817 Microcontroller

• One Yellow User LED

• One Mechanical Button

• Two QTouch® Buttons

• mEDBG

– Auto-ID for board identification in Atmel Studio/MPLAB® X

– One green board status LED

– Programming and debugging

– Virtual COM Port (CDC)

• USB Powered

• ATtiny817 Power Sources:

– 5.0V from USB

– 3.3V regulator

– External voltage

• Arduino Shield Compatible Footprints

1.2 Kit Overview

The ATtiny817 Xplained Mini evaluation kit is a hardware platform to evaluate the ATtiny817.

ATtiny817 Xplained Mini

Introduction

Figure 1-1. ATtiny817 Xplained Mini Evaluation Kit Overview

Digital I/O Low (J202)

Digital I/O High (J201)

Power (J203)

Analog I/O (J204)

PB1

PB0

ATtiny817

Power

Ground

Target I/O

Shared I/Os

QTouch

Bu ttons

PA7

PA6

PA5

PA4

VIN

GND

3V3

PC5

VCC

PB3

PB2

PB4

PB5

PA3

PC4

GND

PB6

PB7

PC5

PA0

PC3

PC2

PC1

PC0

PA1

PA2

User button

User LED

QT Button 1

QT Button 2

CDC TX

CDC RX

UPDI

Ext. clock

Disconnected with

N.M. 0-Ohm

External

Clock

SPI

(J200)

CDC UART

(J105)

mEDBG

(ATmega32U4)

Power source

(J102)

Micro USB

Connector

Target power

(J100)

Status

LED

PC0PC5

User

LED

User

button

Table 1-1. Default Configurations

Function Default Configuration Other Settings

Kit power source (J102) 5.0V USB powered External input VIN (1)

Target power (J100) 5.0V USB powered 3.3V from on-board regulator (1)

ATtiny817 clock Internal 20 MHz oscillator mEDBG clock (2)

Info:

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

1) Details on how to change the power settings are described in 4.1 Power Sources.

2) Details on the mEDBG clock are described in 3.1.1 Xplained Mini Clock Output.

ATtiny817 Xplained Mini

Introduction

2. Getting Started

2.1 Xplained Mini Quick Start

Steps to start exploring the Xplained Mini platform:

1. Download Atmel Studio/MPLAB® X IDE.

2. Launch Atmel Studio/MPLAB® X.

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 Atmel Studio/MPLAB® X.

Once the Xplained Mini board is powered, the green status LED will blink, and Atmel Studio/MPLAB® X will

autodetect which Xplained Mini board is connected. Atmel Studio/MPLAB® X will present relevant information like

data sheets and kit documentation. The ATtiny817 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 Relevant Links

The following list contains links to the most relevant documents and software for the ATtiny817 Xplained Mini.

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

•MPLAB® X IDE - MPLAB® X IDE is a software program that runs on a PC (Windows®, Mac OS®, Linux®) to

develop applications for Microchip microcontrollers and digital signal controllers. It is called an Integrated

Development Environment (IDE) because it provides a single integrated “environment” to develop code for

embedded microcontrollers.

•Atmel START - Atmel START is an online tool that helps the user to select and configure software components

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

•Microchip Sample Store - Microchip sample store where you can order samples of devices.

•Data Visualizer - Data Visualizer is a program used for processing and visualizing data. The Data Visualizer

can receive data from various sources such as the EDBG Data Gateway Interface found on Curiosity Nano and

Xplained Pro boards and COM Ports.

•QTouch® Tools - A collection of tools to design capacitive touch applications.

•QTouch® Design Guide - PTC Robustness design guide document for touch sensor development.

•ATtiny817 Xplained Mini website - Kit information, latest user guide and design documentation.

•ATtiny817 Xplained Mini on Microchip Direct - Purchase this kit on Microchip Direct.

ATtiny817 Xplained Mini

Getting Started

3. Xplained Mini

Xplained Mini is an evaluation platform that provides a set of small boards with access to all microcontroller I/Os. The

platform consists of a series of low-pin-count Microcontroller (MCU) boards, which are integrated with Atmel Studio to

present relevant user guides, application notes, datasheets, and example code. The platform also features a Virtual

COM port for serial communication to a host PC.

3.1 Mini Embedded Debugger

The ATtiny817 Xplained Mini contains the Mini Embedded Debugger (mEDBG) for on-board programming and

debugging. The mEDBG is a composite USB device of two interfaces: A debugger and a virtual COM port.

Together with Atmel Studio, the mEDBG debugger interface can program and debug the ATtiny817. On ATtiny817

Xplained Mini, the UPDI interface is connected between the mEDBG and the ATtiny817.

The virtual COM port is connected to a UART on the ATtiny817 and provides an easy way to communicate with the

target application through the terminal software. It offers variable baud rate, parity, and Stop bit settings.

Note: The settings on the ATtiny817 must match the settings given in the terminal software.

Info: The virtual COM port in the mEDBG requires the terminal software to set the Data Terminal Ready

(DTR) signal to enable the UART pins connected to the ATtiny817. If the DTR signal is not enabled, the

UART pins on the mEDBG are kept in high-z (tri-state), rendering the COM port unusable. The DTR signal

is automatically set by some terminal software, but it may have to be manually enabled in the target

terminal.

The mEDBG controls one status LED on the ATtiny817 Xplained Mini. The table below shows how the LED is

controlled in different operation modes.

Table 3-1. mEDBG LED Control

Operation Mode Status LED

Power-up LED is briefly lit

Normal operation LED is not lit

Programming Activity indicator; the LED flashes when programming/

debugging with the mEDBG

3.1.1 Xplained Mini Clock Output

The mEDBG outputs its CPU clock on a pin.

The clock output can be used to feed the target device with a more accurate clock if this is needed for the application.

By default, this clock is disconnected from the target by a not mounted resistor.

To connect the external clock to the ATtiny817, a 0Ω resistor or strap has to be soldered in the footprint, as shown in

the figure below (R205).

ATtiny817 Xplained Mini

Xplained Mini

Figure 3-1. External Clock Footprint

The mEDBG CPU clock frequency depends on the selected voltage, see the table below.

Table 3-2. CPU Clock vs. Voltage

Target Voltage mEDBG CPU Clock

3.3V 8 MHz

5.0V 16 MHz

3.2 mEDBG Configuration

The operation of the mEDBG can be configured by writing registers in the mEDBG. No configuration is required for

default operation.

3.2.1 mEDBG Low-Power Modes

Two modes enable the mEDBG to save power when connected to an external power source.

EOF mode, where the mEDBG is disabled. When enabled, the ATmega32U4 will enter sleep mode if the USB does

not enumerate within 5 seconds of power-up. In this mode, the external clock is not available to the target MCU.

LOWP mode, where the mEDBG is set to run at 1 MHz. Saving power while maintaining the USB connection for the

COM port. The external clock will be 1 MHz.

Table 3-3. Low Power Modes Operation

Mode External CLK COM Port UPDI Program UPDI Debug

EOF disabled disabled disabled disabled

LOWP forced 1 MHz enabled useless useless

Factory settings enabled enabled enabled enabled

3.2.2 mEDBG Fuse Filter

The mEDBG does not initially allow users to program all fuses of the target device through Atmel Studio, as a filter is

implemented to protect certain fuses. The protected fuses are different for every product using the mEDBG and are

typically clock related fuses that could be set to invalid configurations.

The fuse protection can be disabled by writing the FUSE bit to ‘0’.

ATtiny817 Xplained Mini

Xplained Mini

Info: The fuse filter prevents users from changing critical fuses using Atmel Studio. However, it does not

prevent users from setting fuses freely using the command line interface atprogram bundled with Atmel

Studio.

ATtiny817 Xplained Mini

Xplained Mini

3.2.3 Super User Fantastic Feature Enable Register

Name: SUFFER

Offset: 0x0120

Reset: 0xFF

Property: N/A

The Super User Fantastic Feature Enable Register allows the user to modify the behavior of the mEDBG.

Bit 7 6 5 4 3 2 1 0

EOF LOWP FUSE

Access R/W R/W R/W

Reset 1 1 1

Bit 2 – EOF Extended Off

Writing the EOF bit to ‘1’ sets default operation. Writing the EOF bit to ‘0’ enables the extended off power mode. If no

USB enumeration is successful within five seconds of power-up, the mEDBG enters deep sleep.

Bit 1 – LOWP Low Power

Writing the LOWP bit to ‘1’ sets the system clock to its default value. Writing the LOWP bit to ‘0’ enables low-power

mode. The mEDBG is set to run at 1 MHz, which decreases the power usage.

Bit 0 – FUSE FUSE Protection

Writing the FUSE bit to ‘1’ enables fuse protection when using Atmel Studio. The fuse protection prevents

modification of specific fuses in the ATtiny817 target device that could make the mEDBG on the ATtiny817 Xplained

Mini not usable. Writing the FUSE bit to ‘0’ removes all protection of fuses in the ATtiny817 target device.

WARNING

Writing the FUSE bit to ‘0’ enables modification of all fuses in the ATtiny817. Setting wrong fuse settings

may render the mEDBG not usable on the ATtiny817 Xplained Mini. As an example, if an invalid clock

setting is set, recovery may require an external debugger.

3.3 mEDBG Firmware Upgrade and Manual Bootloader Entry

The mEDBG firmware is updated through the programming dialog in Atmel Studio.

If you are unable to upgrade the mEDBG firmware on your ATtiny817 Xplained Mini, you can try the command line

utility atfw.exe provided with the Atmel Studio. atfw.exe is located in the atbackend folder in your Atmel Studio install

location.

To manually upgrade the firmware, run the following command:

atfw.exe -t medbg -a ..\tools\ mEDBG\medbg_fw.zip

If atfw.exe is unable to find the mEDBG, it may be required to force the ATmega32U4 (mEDBG) to enter its

bootloader. To force the bootloader entry, short-circuit the BOOT pads (J103) and toggle power to the ATtiny817

Xplained Mini board. Run the atfw command above. When the firmware is upgraded, remove the power from the kit

and remove the short-circuit of J103.

Figure 3-2. Force Boot Jumper

ATtiny817 Xplained Mini

Xplained Mini

4. Hardware User Guide

The following sections describe the implementation of the relevant peripherals, headers, and connectors on

ATtiny817 Xplained Mini and their connection to the ATtiny817. The tables of connections in the sections also

describe which signals are shared between the headers and on-board functionality.

The figure below shows the assembly drawing of the ATtiny817 Xplained Mini to help the identification of

components.

ATtiny817 Xplained Mini

Hardware User Guide

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