Avr Microcontroller

Topics: Atmel AVR, Modified Harvard architecture, Atmel Pages: 4 (1244 words) Published: April 2, 2013
The AVR is a modified Harvard architecture machine where program and data are stored in separate physical memory systems that appear in different address spaces, but having the ability to read data items from program memory using special instructions. [edit]Basic families

AVRs are generally classified into six broad groups:
tinyAVR — the ATtiny series
0.5–16 kB program memory
6–32-pin package
Limited peripheral set
megaAVR — the ATmega series
4–512 kB program memory
28–100-pin package
Extended instruction set (multiply instructions and instructions for handling larger program memories) Extensive peripheral set
XMEGA — the ATxmega series
16–384 kB program memory
44–64–100-pin package (A4, A3, A1)
Extended performance features, such as DMA, "Event System", and cryptography support. Extensive peripheral set with DACs
Application-specific AVR
megaAVRs with special features not found on the other members of the AVR family, such as LCD controller, USB controller, advanced PWM, CAN, etc. FPSLIC (AVR with FPGA)
FPGA 5K to 40K gates
SRAM for the AVR program code, unlike all other AVRs
AVR core can run at up to 50 MHz [5]
32-bit AVRs
Main article: AVR32
In 2006 Atmel released microcontrollers based on the new, 32-bit, AVR32 architecture. They include SIMD and DSP instructions, along with other audio and video processing features. This 32-bit family of devices is intended to compete with the ARM based processors. The instruction set is similar to other RISC cores, but it is not compatible with the original AVR or any of the various ARM cores. [edit]Device architecture

Flash, EEPROM, and SRAM are all integrated onto a single chip, removing the need for external memory in most applications. Some devices have a parallel external bus option to allow adding additional data memory or memory-mapped devices. Almost all devices (except the smallest TinyAVR chips) have serial interfaces, which can be used to connect larger serial EEPROMs or flash chips....
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