* AVR is a modified Harvard architecture RISC single chip micro controller
*It is a 28 pin narrow DIP IC
*Developed by Atmel in 1996
*AVR introduce the flash program memory for programming
*Atmega16 is equipped with an internal oscillator for driving its clock.
AVR microcontrollers are available in three categories:
1. TinyAVR – Less memory, small size, suitable only for simpler applications
2. MegaAVR – These are the most popular ones having good amount of memory (upto 256 KB), higher number of inbuilt peripherals and suitable for moderate to complex applications.
3. XmegaAVR – Used commercially for complex applications, which require large program memory and high speed.
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