The Arduino Mega is a microcontroller board based on the ATmega ( datasheet). It has 54 digital input/output pins (of which 14 can be used as PWM. ATmega/V/V/V/V/V [DATASHEET]. Q–AVR–02/ 1. Pin Configurations. Figure TQFP-pinout. This is supposed to be an atmega with SPI ethernet from the . From Atmega datasheets, it says that the pin will go high with minimum.

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A pre-installed bootloader program allows the board to be re-programmed via a standard RS serial plug with new programs that users can write with the free Atmel IDE tools.

ATMEGA Datasheet catalog

The radios are driven with ATmegap processors, which are supported by a custom segmented LCD display driven by an ATmegap processor. Sign up or log in Sign up using Google. Email Required, but never shown. Views Read Edit View history. Numerous companies produce AVR-based microcontroller boards intended for use by hobbyists, robot builders, experimenters and small system developers including: It does this by feeding the output of the PORT flipflop back into its input and clocking it to create a divide by 2 counter yellow.

With the growing popularity of FPGAs among the open source community, people have started developing open source processors compatible with the AVR instruction set. These are intended to monitor and control the remote nodes, relying on host power rather than local batteries.


Sparkfun has an amazing tutorial Should your PORT register have a mix of pins defined as inputs and outputs, you can still read the values just fine. However, it is not completely regular:. Some devices have a parallel external bus option to allow adding additional data memory or memory-mapped devices. Retrieved from ” https: Furthermore, if 8 pin of one port is configured to be mixed between output and input then how the data of each bit of each pin is organized to be store in a register which contain 8 bit.

There are many different signal routing boards that could be used with a single target board, depending on what device is in the ZIF socket.

The AVR instruction set is more orthogonal than those of most eight-bit microcontrollers, in particular the clones and PIC microcontrollers with which AVR competes today. Post as a guest Name.

(PDF) ATMEGA256RFR2 Datasheet download

From Wikipedia, the free encyclopedia. Only the JTAG port uses conventional 2. The debugWire interface enables debugging using only one pin the Reset pinallowing debugging of applications running on low pin-count microcontrollers.

The kit includes two AVR Raven boards, each with a 2. The ATmega and ATmega, with more pinout and memory capabilities, have also been employed to develop the Arduino Mega platform. Single-board microcontroller Special function register.

Although the MCUs are 8-bit, each instruction takes one or two bit words. Program instructions are stored in non-volatile flash memory. Arduino has a good article on this.


The reset line has an internal pull-up resistor, but if the environment is noisy it can be insufficient and reset can therefore occur sporadically. I don’t understand what these term means: This prescaler can be reconfigured by software during run-time, allowing the clock speed to be optimized. LogicGreen Technologies, a clone of the ATmega Embedded system Programmable logic controller. Atmel’s AVRs have a two-stage, single-level pipeline design.

ATMEGA 데이터시트(PDF) – ATMEL Corporation

Sign up using Facebook. The signal routing board sits between the base board and the target board, and routes the signals to the proper pin on the device board.

In addition to the chips manufactured by Atmel, clones are available from LogicGreen Technologies. Some AVRs also have a system clock prescaler that can divide down the system clock by up to The designers worked closely with compiler writers at IAR Systems to ensure that the AVR instruction set provided efficient compilation of high-level languages.

A wide variety of third-party programming and debugging tools are available for the AVR.