AVR364: MEGA-1284P Xplained Hardware User's Guide 8-bit

AVR364: MEGA-1284P Xplained Hardware User's Guide 8-bit
AVR364: MEGA-1284P Xplained Hardware
User's Guide
Features
• Atmel® megaAVR® ATmega1284P microcontroller
- Target controller
• Atmel AVR® AT32UC3B1256 32-bit microcontroller
- Board controller
- Communication gateway
• Analog input (to ADC)
- Temperature sensor
- Light sensor
- RC filter
• Digital I/O
- Three mechanical buttons
- Four LEDs
- Four expansion headers
• Footprints for external memory
- Atmel AT45DB series DataFlash® serial flash
- Atmel AT25DF series industrial standard serial data flash
• Touch
- One Atmel QTouch® button
8-bit
Microcontrollers
Application Note
1 Introduction
The Atmel MEGA-1284P Xplained evaluation kit is a hardware platform for
evaluating the ATmega1284P MCU.
The kit offers a large range of features that enable the megaAVR user to get
started using megaAVR peripherals right away and to get an understanding of how
to integrate a megaAVR MCU in their own design.
Figure 1-1. MEGA-1284P Xplained evaluation kit.
Rev. 8377A-AVR-04/11
2 Related items
®
Atmel AVR Studio 4 (free IDE from Atmel)
http://atmel.com/dyn/products/tools_card.asp?tool_id=2725&category_id=163&family
_id=607&subfamily_id=760
Atmel AVR Dragon™ (on-chip programming and debugging tool)
http://atmel.com/dyn/products/tools_card.asp?tool_id=3891&category_id=163&family
_id=607&subfamily_id=760
Atmel AVR JTAGICE mkII (on-chip programming and debugging tool)
http://atmel.com/dyn/products/tools_card.asp?tool_id=3353&category_id=163&family
_id=607&subfamily_id=760
Atmel AVR ONE! (on-chip programming and debugging tool)
http://atmel.com/dyn/products/tools_card.asp?tool_id=4279&category_id=163&family
_id=607&subfamily_id=760
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3 General information
This document targets the Atmel ATmega1284P evaluation kit revision 3, and parts of
the document may, therefore, be inconsistent with earlier revisions of the product. For
earlier revisions, please refer to the schematics, which is the only documentation
available for these revisions. The Atmel MEGA-1284P Xplained kit is intended to
demonstrate the ATmega1284P, and the hardware that relates to the Atmel
AT32UC3B1256 (board controller) is, therefore, not covered in detail in this
document.
Figure 3-1. Overview of the MEGA-1284P Xplained kit.
Header J1
Power
measurement
header
Header J3
JTAG
USB
Header
Connector
(ATmega1284P)
Mechanical
Button
(SW0)
Mechanical
Button
(SW1)
NTC
Sensor
LIGHT
Sensor
LED2
Power &
Status LED
RC
Filter
Mechanical
Button
(SW2)
QTouch
Button
(QTB0)
LED1
Dataflash
footprints
Header J2
ATmega1284P
Header J4
LED3
AT32UC3B1256
Reset button
ATmega1284P
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Figure 3-2. Functional overview of the Atmel MEGA-1284P Xplained kit.
Digital
USB device
Analog
Board
controller
Status LED
Output
12MHz
XTAL
AT32UC3B1256
USART1
J1
Communication
I/O
J2
ADC
Input
J3
GPIO
J4
Communication
Main
controller
R/W
DataFlash
(footprint only)
Input
3xMechanical
buttons
I/O
Input
1xQTouch
button
I/O
Output
ATmega1284P
32kHz
XTAL
Input
I/O
Program and debug
JTAG
4xLEDs
Analog input:
- NTC sensor
- Light sensor
- RC filter
Power measurement
JUMPER
3.1 Preprogrammed firmware
The MEGA-1284P Xplained kit comes with both the Atmel ATmega1284P and the
Atmel AT32UC3B1256 preprogrammed.
The preprogrammed firmware in the ATmega1284P is set up with example code that
allows the user to choose different sleep modes, and provides an example of how to
use the light sensor to dim the four onboard LEDs. It also includes a boot loader
(AVROSP) which allows the user to reprogram the ATmega1284P without using an
external programmer. Please refer to the Atmel application note, AVR370: MEGA1284P Xplained Getting Started Guide, for more details regarding the
preprogrammed firmware.
The preprogrammed AT32UC3B1256 firmware offers features such as a boot loader
for self-programming of the board controller itself, and a USART-to-USB gateway,
which can be used to communicate with the target controller, the ATmega1284P.
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3.2 Power supply
The kit is powered via the USB connector, which presents two options for powering it:
Either connect the kit to a PC through a USB cable or to a 5V USB power supply
(AC/DC adapter).
The 5V is regulated to 3.3V with an LDO regulator, which provides power to the entire
board. The Atmel ATmega1284P is powered by 3.3V, but if 1.8V operation is desired,
some modifications to the board are needed. This includes replacing the regulator
with one that delivers a 1.8V output and rerouting the power to the device (see
schematic for an explanation). As some of the other ICs on the Atmel MEGA-1284P
Xplained require 3.3V to operate correctly, these devices have to be removed.
3.3 Measuring the ATmega1284P power consumption
As part of an ATmega1284Pevaluation, it can be of interest to measure its power
consumption. The two-pin power measurement header is the only connection
between the VCC_P3V3 common power plane and the VCC_MCU_P3V3 power
plane. By replacing the jumper with an ammeter, it is possible to determine the
ATmega1284P current consumption. To locate the power measurement header,
please refer to Figure 3-1.
Do not power the board without having the jumper or an ammeter mounted. If
this is done the board might be powered through an I/O pin. The result might be
erratic behavior and the device might get damaged.
3.4 Communication through the USART-to-USB gateway
The ATmega1284P USART is connected to a USART on the Atmel AT32UC3B1256.
The ATmega1284P USART is communicating at 57600 baud using one start bit, eight
data bits, one stop bit, and no parity.
When the AT32UC3B1256 device is enumerated (connected to a PC). the data
transmitted from the ATmega1284P is passed to a (virtual) COM port. This means
that it is possible to use a terminal program on a PC to receive the transmitted data.
Similarly data transmitted from the PC COM port is passed to the ATmega1284P
USART through the gateway.
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4 Connectors
The Atmel MEGA-1284P Xplained kit has five 10-pin, 100mil headers. Two headers
have a fixed communication interface (J1 and J4). One header has analog
functionality (J2), and the last header (J3) has general purpose digital I/O.
The 90° angled header is the Atmel ATmega1284P JTAG programming and
debugging header.
For the location of the respective headers, refer to Figure 3-1.
4.1 Programming headers
The ATmega1284P can be programmed and debugged by connecting an external
programming/debugging tool to the JTAG pin header. The pin header has a standard
JTAG programmer pin-out (refer to online help in the Atmel AVR Studio), enabling
tools like the Atmel AVR JTAGICE mkII or the Atmel AVR ONE! to be connected
directly to the header.
The grey, female, 10-pin header on the AVR JTAGICE mkII must be used when
connecting to the kit. A scoring in the board is made to fit the orientation tab on
the header.
A standoff adapter (nr. 1) is needed when using the AVR ONE!
Pin 1 on the JTAG header is at the top right corner. This is rotated 180°
compared to the other headers (J1, J2, J3, and J4).
Table 4-1. MEGA-1284P Xplained programming and debugging interface – JTAG.
(1)
Pin
JTAG
1
TCK
2
GND
3
TDO
4
VCC
5
TMS
6
nSRST
7
-
8
-
9
TDI
10
GND
Note:
1. Standard pin-out for the AVR JTAGICE mkII and other Atmel programming tools
The Atmel AT32UC3B1256 can be programmed through its boot loader. The boot
loader is evoked by shorting the two holes marked BOOTLOADER BOARD
CONTROLLER on the bottom side of the board before applying power to the board.
The two holes have 100mil spacing, enabling the user to solder in a two-pin header
and use a jumper to easily enter the boot loader. Programming is performed through
the boot loader programmer target in the Atmel AVR Studio.
Alternatively, the AT32UC3B1256 can also be programmed by connecting a
programming tool, such as the AVR JTAGICE mkII, to the 10 holes marked JTAG
BOARD CONTROLLER on the bottom side of the board. The holes have 100mil
spacing, letting the user solder in a 10-pin header to program the board controller.
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Please note that programming the Atmel AT32UC3B1256 using a programming
tool will erase the boot loader.
Please refer to the Atmel application note, AVR370: MEGA-1284P Xplained
Getting Started Guide, for more details regarding how to program the onboard
microcontrollers.
4.2 I/O expansion headers
There are four available I/O expansion headers in the kit. Because of the low pin
count on the device, the I/O expansion header pins are shared with onboard
functionality. If “clean” expansion ports are needed, cut-straps are available to
remove onboard functionality. Table 4-2 through Table 4-5 show what is shared on
the respective header pins.
Table 4-2. Atmel MEGA-1284P Xplained I/O expansion header – J1.
Pin
J1
ATmega1284P pin
Shared with onboard functionality
1
TWI SDA
PC1
Header J4, board controller
2
TWI SCL
PC0
Header J4, board controller
3
USART RXD0
PD0
Header J4
4
USART TXD0
PD1
Header J4
5
6
7
SPI SS
(1)
PB4
Board controller
SPI MOSI
(1)
PB5
Header J4, DataFlash, board controller
SPI MISO
(1)
PB6
Header J4, DataFlash, board controller
PB7
Header J4, DataFlash, board controller
(1)
8
SPI SCK
9
GND
-
-
10
VCC_P3V3
-
-
Note:
1. These signals can be disconnected from the board controller by cutting the cutstraps marked SPI on the bottom side of the board.
Table 4-3. MEGA-1284P Xplained I/O expansion header – J2.
Pin
J2
(1)
ATmega1284P pin
Shared with onboard functionality
PA0
Possible to connect to AREF
1
ADC0
2
ADC1
PA1
-
3
ADC2
PA2
-
4
ADC3
PA3
-
5
ADC4
PA4
-
ADC5
(2)
PA5
Filter output
ADC6
(2)
PA6
Light sensor
8
ADC7
(2)
PA7
NTC sensor
9
GND
-
-
10
VCC_ANA_P3V3
-
-
6
7
Notes:
1. AREF with 100nF capacitor to GND can be connected to ADC0 by shorting two
pads marked EXTERNAL AREF on the bottom side of the board.
2. These signals can be disconnected from the sensor/filter output by cutting the
cut-straps marked SENSORS & FILTER on the bottom side of the board.
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Table 4-4. Atmel MEGA-1284P Xplained I/O expansion header – J3.
Pin
J3
ATmega1284P pin
Shared with onboard functionality
1
GPIO0
PB0
SW0, LED0
2
GPIO1
PB1
SW1, LED2
3
GPIO2
PB2
SW2, LED3
4
GPIO3
PB3
LED1
5
GPIO4
PD4
J4 (SPI SS1), DataFlash (SPI SS1)
PD5
Filter input
(1)
6
GPIO5
7
GPIO6
PC4
JTAG(TDO)
8
GPIO7
PC5
JTAG(TDI)
9
GND
-
-
-
-
10
VCC_P5V0
Notes:
(2)
1. This signal can be disconnected from the filter input by cutting the cut-strap
marked FILTER INPUT in the SENSORS & FILTER section on the bottom side
of the board.
2. Pin 10 of header J3 is connected to the USB voltage (VCC_P5V0).
Table 4-5. MEGA-1284P Xplained I/O expansion header – J4.
Pin
J4
ATmega1284P pin
Shared with onboard functionality
1
TWI SDA
PC1
Header J1, board controller
2
TWI SCL
PC0
Header J1, board controller
3
USART RXD1
PD2
Board controller
4
USART TXD1
PD3
Board controller
5
SPI SS1
PD4
Header J3 (GPIO4), DataFlash
PB5
Header J1, DataFlash, board controller
SPI MOSI
(1)
7
SPI MISO
(1)
8
SPI SCK
9
10
6
Note:
8
PB6
Header J1, DataFlash, board controller
PB7
Header J1, DataFlash, board controller
GND
-
-
VCC_P3V3
-
-
(1)
1. These signals can be disconnected from the board controller by cutting the cutstraps marked SPI on the bottom side of the board.
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5 Memories
The Atmel MEGA-1284P Xplained kit does not have any external memories mounted
on the board. Footprints are available for adding either an industrial standard flash
device or an Atmel proprietary serial DataFlash device.
The footprints share the same SPI lines, including the chip select, and it is,
therefore, not possible to mount devices on both footprints at the same time.
Table 5-1. Compatible devices for the footprints.
Atmel AT45DB
Atmel AT25DF
AT45DB64D2-CNU
AT25DF641A-SH
AT45DB321D-MWU
AT25DF321A-SH
AT45DB161D-SS
AT25DF161-SH
AT45DB081D-SS
AT25DF081-SSH
AT45DB041D-SS
AT25DF021-SSH
AT45DB021D-SS
AT45DB011D-SS
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6 Miscellaneous I/O
6.1 Mechanical buttons
The board is equipped with three mechanical buttons. The buttons (SW0:2) are
shared with LED0, LED2, and LED3. Onboard protection circuitry is added to avoid a
short when driving the port high at the same time as pushing the button, which will
short it to the ground. To be able to use both button and LED, time multiplexing has to
be used.
To be able to detect a button press, the firmware has to periodically set the I/O pin to
input with pull-up and check if it is low. When doing this fast enough, the human eye
will not see any change in the LED.
6.2 LEDs
The Atmel MEGA-1284P Xplained has four standard yellow LEDs mounted onboard,
which are connected to the Atmel ATmega1284P. The four LEDs are active low.
LED0, LED2, and LED3 are shared with the three mechanical buttons (SW0:2). When
turning an LED on, set the I/O pin to output low. When turning an LED off, set the I/O
pin as input with pull-up. The protection circuitry added to the button will make the
LED shine brighter when the button is pressed and the LED is turned on. When the
LED is off, any button press will light up the LED.
The Atmel MEGA-1284P Xplained also has one dual LED mounted near the USB
connector. This is the power and status LED, which is connected to the board
controller. This LED will be green when power is applied, and will toggle between
green and orange when communication over USB is ongoing.
6.3 Analog I/O
An RC filter, a light sensor, and an NTC are connected to ADC5, ADC6, and ADC7,
respectively. These analog sources can be used as input to the ADC. All of the
analog signals can be disconnected by cutting the cut-straps on the bottom side of
the board.
The RC filter (first-order low-pass) has an approximate 3dB cut-off frequency of
159Hz. The input to the RC filter is GPIO5 (PD5) on the ATmega1284P, which can be
configured to output a PWM signal to the RC filter. This can be used to generate a
DC voltage on the output of the RC filter, which can be measured on the ADC5 pin.
As this is a first-order filter, the ripple on the DC voltage is inversely proportional to
the input frequency. A higher input frequency will result in lower ripple on the output.
6.4 Touch
The MEGA-1284P XPLAINED kit has one Atmel QTouch button, QTB0.
Table 6-1. MEGA-1284P Xplained touch connections.
10
Touch sensor onboard
reference
QTouch method pin name
ATmega1284P pin
QTB0
SNSK0
PD7
QTB0
SNS0
PD6
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6.5 Board controller
The Atmel AT32UC3B1256 board controller and the Atmel ATmega1284P are
connected through TWI, SPI, and USART interfaces. All interfaces can be used to
communicate between the devices, but only the USART is implemented by default on
the board controller.
Table 6-2. ATmega1284P and board controller communication interface.
Interface
ATmega1284P pin
Atmel AT32UC3B1256 pin
UART RX
(1)
PD2
PA24
UART TX
(1)
PD3
PA23
TWI SCL
PC0
PA09
TWI SDA
PC1
PA10
SPI SS
(2)
PB4
PA16
SPI MOSI
(2)
PB5
PA14
SPI MISO
(2)
PB6
PA25
PB7
PA17
SPI SCK
(2)
Notes:
1. This represents the RX and TX on the ATmega1284P. The RX is connected to
TX on the other device, and vice versa.
2. These signals can be disconnected from the board controller by cutting the cutstraps marked SPI on the bottom side of the board.
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7 Included code example
For documentation, help, and examples on the drivers used, please refer to the Atmel
application note, AVR370: MEGA-1284P Xplained Getting Started Guide.
8 Revision history
The kit revision can be identified by a barcode sticker on the bottom side of the kit.
For example, A09-1164/4 indicates that the product number for this kit is A09-1164
and the revision is 4.
8.1 Revision 4
Revision 4 of the MEGA-1284P Xplained kit is the first revision released.
Errata
The MEGA-1284P Xplained has passed FCC Part 15, subpart B, class B
(unintentional radio-frequency devices). However the MEGA-1284P Xplained has not
passed CE approval as the USB communication may fail if exposed to ESD pulses
above 2kV.
Workaround
Cycle power for the kit (unplug and plug the USB cable) to re-enumerate to the PC, to
reestablish USB communication.
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9 EVALUATION BOARD/KIT IMPORTANT NOTICE
This evaluation board/kit is intended for use for FURTHER ENGINEERING,
DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY. It is
not a finished product, and may not (yet) comply with some or any technical or legal
requirements that are applicable to finished products, including, without limitation,
directives regarding electromagnetic compatibility, recycling (WEEE), FCC, CE, or UL
(except as may be otherwise noted on the board/kit). Atmel supplied this board/kit
“AS IS,” without any warranties, with all faults, at the buyer’s and further users’ sole
risk. The user assumes all responsibility and liability for proper and safe handling of
the goods. Further, the user indemnifies Atmel from all claims arising from the
handling or use of the goods. Due to the open construction of the product, it is the
user’s responsibility to take any and all appropriate precautions with regard to
electrostatic discharge and any other technical or legal concerns.
EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER
USER NOR ATMEL SHALL BE LIABLE TO EACH OTHER FOR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
No license is granted under any patent right or other intellectual property right of
Atmel covering or relating to any machine, process, or combination in which such
Atmel products or services might be or are used.
Mailing Address: Atmel Corporation, 2325 Orchard Parkway, San Jose, CA 95131
Copyright © 2011, Atmel Corporation
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10 Table of contents
Features ............................................................................................... 1
1 Introduction ...................................................................................... 1
2 Related items.................................................................................... 2
3 General information ......................................................................... 3
3.1 Preprogrammed firmware.................................................................................... 4
3.2 Power supply ....................................................................................................... 5
3.3 Measuring the ATmega1284P power consumption ............................................ 5
3.4 Communication through the USART-to-USB gateway........................................ 5
4 Connectors ....................................................................................... 6
4.1 Programming headers ......................................................................................... 6
4.2 I/O expansion headers ........................................................................................ 7
5 Memories .......................................................................................... 9
6 Miscellaneous I/O........................................................................... 10
6.1 Mechanical buttons ........................................................................................... 10
6.2 LEDs .................................................................................................................. 10
6.3 Analog I/O .......................................................................................................... 10
6.4 Touch ................................................................................................................. 10
6.5 Board controller ................................................................................................. 11
7 Included code example.................................................................. 12
8 Revision history ............................................................................. 12
8.1 Revision 3 .......................................................................................................... 12
9 EVALUATION BOARD/KIT IMPORTANT NOTICE ........................ 13
10 Table of contents ......................................................................... 14
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Atmel Corporation
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Tel: (+1)(408) 441-0311
Fax: (+1)(408) 487-2600
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Tel: (+81) 3523-3551
Fax: (+81) 3523-7581
© 2011 Atmel Corporation. All rights reserved. / Rev.: CORP072610
Atmel®, Atmel logo and combinations thereof, AVR®, AVR® logo, AVR Studio®, megaAVR®, QTouch®, DataFlash®, and others are
registered trademarks of Atmel Corporation or its subsidiaries. Other terms and product names may be trademarks of others.
Disclaimer: The information in this document is provided in connection with Atmel products. No license, express or implied, by estoppel or otherwise, to
any intellectual property right is granted by this document or in connection with the sale of Atmel products. EXCEPT AS SET FORTH IN THE ATMEL
TERMS AND CONDITIONS OF SALES LOCATED ON THE ATMEL WEBSITE, ATMEL ASSUMES NO LIABILITY WHATSOEVER AND DISCLAIMS
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USE THIS DOCUMENT, EVEN IF ATMEL HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Atmel makes no representations or
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8377A-AVR-04/11
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