A company that makes microcontrollers and other chips, most popularly the AVR line of ATMega and ATtiny. These chips are the basis of the popular Arduino line of prototyping platform boards.

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102 views

A Beginner's Question: 32 bit vs 8 Bit [closed]

I am in the process of getting started with electronics, and I have come to a crossroads. Being a complete beginner, should I start with 32 bit microcontrollers (specifically Atmel's UC3 series), or 8 ...
3
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1answer
234 views

What does the 'A' letter in Atmel's ATtiny devices mean?

I have both on stock: ATtiny861A-SU and ATtiny861-20SU. But I can not find out any difference between them except 'In-System Programmable via SPI Port' available for 'A' version. Could anyone tell ...
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1answer
33 views

ATmega dual pin function JTAG and analog input

I need measure temperature to adjust ticks as temperature changes. I suppose thermistor nearby crystal (10ppm) as low cost solution. I'm using AT90USBxxx but I have allocated PF0-3 for more important ...
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0answers
70 views

Unable to get bootloader working on custom PCB with AT32UC3L

I have designed a PCB for a client recently, everything is fine with the hardware and software (application is working as it is supposed to). Now we are facing the need to update the program inside ...
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1answer
83 views

ATmega2560 assembly pin read and compare logic problem

I apologize if my question was vague. Program: Atmel Studio 6 I am trying to make a program that enters an loop which it will only break out of when a pin goes low. ...
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2answers
155 views

How many servos can I run on an ATtiny85?

This is my first time asking a question on this website, so please correct me if I'm doing something wrong... I have been working on a small project which runs three Servo motors on an ATtiny85, ...
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82 views

VGA repeater/extender circuit

Apparently noone ever needed anything like this on the internet because I was not able to find any example, so I hope this will become the reference question. I need to repeat a vga 800x600 signal up ...
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0answers
47 views

AVR: check controller health?

I'm very new to programming controllers and while reading a book I've been building a circuit that looks like has killed my controller. Thats the output from avrdude and MKII clone programmer: ...
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1answer
66 views

arduino burning bootloader. avrdude issues

When I try to burn a bootloader to my atmega328 the arduino IDE gives me an error: avrdude: usbdev_open(): did not find any USB device "usb" When I burn a ...
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1answer
53 views

Can Atmel Single Wire Interface (SWI) Support more than one device on the bus?

I'm interested in using multiple ATSHA204's on a bus. UART or I2C if we have to use more than one pin, but my question is if we use Atmel's bit-banged SWI protocol, will it support more than once ...
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90 views

How to program Atmel ATtiny88 (not 45 or 85)? [closed]

There are lots of tutorials for programming the ATtiny45 and 85 with a breadboard and Arduino, but how would I program the ATtiny88? It's an 8 bit AVR microcontroller, but it can not be mounted on a ...
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2answers
103 views

68 series CPU vs 80 series CPU

I'm reading a lot of LCD driver data sheets at the moment and they often have multiple interfaces (serial, 8-bit, 16-bit, etc...). They are also often also split into two sections "80 series CPU" and ...
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98 views

Why are some AVRs marked with 'atmega' and some marked with 'mega'?

I'm working on hacking the MCU in my MLP4DSM radio for an RC helicopter. The model number on the MCU is scratched out, but I can clearly read MEGA without an ...
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1answer
127 views

AT89c51RE2 replaced with AT89LP51RD2, ISP programming

have a question I can't seem to figure out the answer to. We have existing boards running off the AT89c51RE2 processor. Works great because it supports In-System-Programming. This means we can use ...
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0answers
55 views

Atmel Studio JTAG Debugger Behaviour

The qeustion: I would like to know what is different about the way JTAG treats the "step over" and "step into" commands. Background: I am trying to set a GPNVM bit on a SAM3N (ARM Cortex M3) chip ...
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2answers
294 views

Updating Arduino Uno R3 ATMega16u2 firmware [closed]

Regarding another big problem I have with some of my arduino's boards I start to suspect the ATMega16U2 chip to be corrupted and would like to be sure that he's working fine. So I've download Atmel ...
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1answer
93 views

Seeking 4x3 keypad for Atmel UC3 microprocessor

I was doing a combined project with a friend, with me on s/w and him on h/w. After a year of coding on my part & not much activity on his, he announced that he is "too busy" to continue. That ...
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1answer
43 views

AVR Dragon: Debug Frequency?

I think of buying an AVR Dragon or an AVR JTAG ICE MKIII. But before I do this, I need to know what side effects the reduced debug frequency has on an ATMEGA328P while debugging. I make heavy use of ...
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2answers
84 views

AVR Reset pin for a long time

I just have a little Question, if I drive a reset pin to low (reset active) of an Atmel AVR for a long time (1 week for example, in fact it'll be really variable depending on the use) can it cause ...
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125 views

MAX7219 interfaced with ATmega128 producing strange results on 7 segment display

I have built a circuit using an ATmega128 interfacing a MAX7219 decoder to control a 7-segment display. I would appreciate if anyone could help me figure out a problem I'm having with my setup. I am ...
5
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2answers
183 views

Can a wrong crystal oscilator capacitor burn the MCU?

Short story: I am using an Atmel AT32UC3C2512C MCU and I selected a 20MHz crystal oscillator for it and two NP0 10pF capacitors. I was in doubt between 10pF, 15pF or 22pF, so I decided to start with ...
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1answer
60 views

AVR32 Drive Strength

The UC3C Datasheet doesn't provide a clear explanation about "drive strength", how it behaves and the side effects in projects. After fabricating my board I realized I placed a LED on a x1 strength ...
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146 views

ATXmega: DMA and USART communication

I am working on an application on an ATXmega256A3 for measuring data. Ideally, the application would be able to communicate cleanly via UART with hardware handshake measure just in time even if ...
2
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1answer
104 views

Atmel AT86RF233 read phase measurement

I've started working with the AT86RF233 a few weeks ago and found the Ranging Toolbox (RTB) package quite impressive. It's the first time I'm using wireless modules, so I wanted to see if I could use ...
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3answers
403 views

RxD TxD equivalent pins in USB

I want to build a USB Programmer currently for AT89C51. I am stuck on how to make it communicate with PC. In RS232, the RxD TxD pins are straight forward, we just need to use Logic Level Converter to ...
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3answers
271 views

Counter: pulse every 8 clocks

I have a square signal (fixed but can be between 12MHz and up to 48MHz) and I would like to create every 8 clocks a pulse as brief as possible, no more than 1/4 of the period. First, a couple of ...
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1answer
42 views

Minimal Atmel ATSAM4LC4A parts requirement [closed]

I want to make myself a developmet board with that chip. http://www.atmel.co.il/devices/ATSAM4LC4A.aspx And I would like to get a schematic or anything that will help building a development board. ...
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1answer
35 views

Connecting Atmel AVRISP to JTAGICE header

I have an AVR board with 10-pin JTAGICE header and a 6-pin ISP. Can I somehow connect the ISP to program this board without having JTAG functionality?
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3answers
94 views

Is there any problems or issues with holding !RESET low on ATMEL ATMEGA328P till rest of board self checks?

I'd like keep an ATMEL ATMega328P in reset for about 4 sec while the rest of the board self checks on startup. Is this OK? Are there any issues that would make holding the RESET low for this extended ...
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81 views

Debug using avr-gdb from remote debug server in Proteus/ASIS

I am trying to debug an ATmega2560 using avr-gdb using an emulated application running in Proteus/ASIS. The idea is to emulate the JTAG from the microcontroller and create a target debug server from ...
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2answers
278 views

Arduino Uno R3: Controlling Tx and Rx LEDs

I am currently attempting to control the Arduino Uno's Tx and Rx LEDs. These are connected to digital pins 0 and 1 respectively, which are AFAIK, PD4 and PD5. They are held at +5V, so I assumed that ...
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41 views

SDRAM timing requirements

I am interfacing a Micron MT48H16M32LFCM-75 SDRAM with an Atmel AT91SAM9G20 and I need to verify on paper (as far as possible), that the timing specifications between those two devices are compatible. ...
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2answers
1k views

How different is the Arduino language than Atmel Studio language? [closed]

I see that on the official Arduino website, the reference page contains the functions and vales you would use specified to the Arduino compiler. http://arduino.cc/en/Reference/HomePage What would ...
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1answer
144 views

What is the PIC equivalent to AVR's ICP?

On many AVR devices (afaik every one that includes at least one 16bit timer), there is an ICP (Input Capture Pin) that fires an edge-triggered interrupt. What's the equivalent on a PIC micro? Does ...
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79 views

Help with ATSAM4S8B

Is there anyone else who is using the Atmel ATSAM4S8B microcontroller here? I have soldered the part onto my board. When I turn on power, the output of the internal linear regulator is only 1.01V. I ...
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2answers
831 views

Atmel Studio 6 Simulator Not Showing Up

I was looking to run the simulator for an AVR controller, but when I went to set my debugging tools as outlined in this video- http://www.youtube.com/watch?v=9QlDSNeuAdY I do not have anything show ...
2
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1answer
77 views

AVR32 Internal regulator

I am not pretending to use this, but as a general curiosity, when the AT32UC3C2512C datasheet says in page 1259, Table 40-20, parameter Iout, that the internal 3.3V regulator has a 35mA DC output ...
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3answers
409 views

Why IAR Compiler?

I just saw an Application Note from Atmel about how to compile some code in IAR and I wonder, why would anyone use an external compiler if Atmel already provides the Atmel Studio, with a Visual Studio ...
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2answers
259 views

Voltage divider to sense voltage on arduino

I am working on a DC voltmeter for monitoring my solar panels. Total voltage of my panels can go up to a maximum of 50 volts. I designed a voltage divider with 100k and 10k resistors. For full voltage ...
2
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1answer
111 views

Using an Arduino Uno to program AT32UC3B

Is it possible to use the Arduino as a programmer for an Atmel 32 bit microprocessor? I have tried searching for something and was not able to find anything. If anyone could give any insight that ...
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1answer
96 views

Clocks setup when programming Atmel via ISP?

When programming an Atmel microchip over SPI (ISP), what external clocking do I have to provide to programee? Does it have to match programmer's internal clock frequency, or can be totally different ...
6
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1answer
445 views

PWM Modes: Center Aligned and Left Aligned

I am using the Atmel AT32UC3C2512C and looking into the datasheet there are two kinds of PWM modes: Center Aligned and Left Aligned. I would like to know when one is supposed to use each one of ...
3
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1answer
171 views

USB Termination Resistor

I am using the Atmel AVR32 UC3C AT32UC3C2512C for a project and the datasheet doesn't say anything about terminating the USB connection, but the AVR32768 Application note, clearly points out a 39 ohm ...
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1answer
146 views

Are there any ATxmega chips with bi-directional SPi ports?

I searched the datasheets shown for the ATxmega chips in the Microcontroller Selector, shown on the left side of http://www.atmel.com/products/microcontrollers/default.aspx, for any ATxmega chips with ...
3
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1answer
281 views

Atmel Xmega PWM problem

I am trying to get the pwm working on the Atmel Xmega256A3BU. I am not getting the desired PWM on the port pin. Here's my initialization for the PWM generation in the code. ...
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132 views

Atmel WinCUPL and SPLD programming

I'm trying to program SPLD ATF16V8C. ...
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1answer
488 views

Making a star network using 5 xbee series 1 modules in AT mode; how to do it?

I am trying to connect more than two XBee series 1 modules in a star network. The node point will take data from all endpoints one by one and process it, then send data back to a PC terminal. In ...
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34 views

What does a preamble look like in the definition of an IEEE 802.15.4 frame?

If you look under the section "802.15.4 Frame Format" on this page you will see it defines Preamble Sequence : 4 octets Start Frame Delimiter (SFD) : 1 octet ...
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1answer
43 views

Can I replace an AT28c17 with a CAT28c65B without changing my software?

The AT28c17 is a 16k e2prom while the CAT28c65B is 64K bit e2prom and both are in a 32 pin PLLC package. They have 10 adresss lines with the only difference being the AT28c17 has A0-A10 adress lines ...
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60 views

how do you transmit bytes out from an atmel radio?

I have an AT86RF233 radio connected to an MSP 430 microcontroller via SPI. How do I send a simple string "hello" out from the atmel radio? Table 6.2 (SPI Command Byte Definition) on pg. 16 of the ...