About AVR

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##### General Information

Atmel's AVR microcontrollers have a RISC core running single cycle instructions and a well-defined I/O structure that limits the need for external components.

Internal Oscillators, Timers, USART, SPI, pull-up resistors, Pulse Width Modulation, ADC, Analog Comparator and Watchdog Timers are some of the features you will find in AVR devices.

##### AVR Instruction

AVR instructions are tuned to decrease the size of the program whether the code is written in C or Assembly.

With On-chip In-System Programmable Flash and EEPROM, the AVR is a perfect choice in order to optimize cost and get product to the market quickly.

##### AVR Core

The AVR core combines a rich instruction set with 32 general purpose working registers.

All the 32 registers are directly connected to the Arithmetic Logic Unit (ALU), allowing two independent registers to be accessed in one single instruction executed in one clock cycle.

The resulting architecture is more code efficient while achieving throughputs up to ten times faster than conventional CISC microcontrollers.

##### Technology

The AVR is manufactured using Atmel’s high density non-volatile memory technology.

The On-chip ISP Flash allows the Program memory to be Reprogrammed In-System through an SPI serial interface, by a conventional non-volatile memory programmer, or by an On-chip Boot program running on the AVR core.

The Boot program can use any interface to download the Application program in the Application Flash memory. Software in the Boot Flash section will continue to run while the Application Flash section is updated, providing true Read-While-Write operation.

By combining an 8-bit RISC CPU with In-System Self-Programmable Flash on a monolithic chip, the AVR is a powerful microcontroller that provides a highly flexible and cost effective solution to many embedded control applications.

##### Tools support

The AVR is supported with a full suite of program and system development tools including: C Compilers, Macro Assemblers, Program Debugger/Simulators, In-Circuit Emulators, and Evaluation kits.