AVR

History of AVR

fig.1 AVR Family members

AVR was developed in the year 1996 by ATMEL corporation. the architecture of AVR was developed by Alfa-Egli Bogen and Vegard Wollan. hence naming derive by its developer Alf  Vigard RISC microcontroller.

AVR family gets divided in three categories:

1. Tiny AVR - small size, less memory ,less number of task can perform at a time.
2. Mega AVR -Medium size, available with more specifications , ability to perform complex task.
3. Xmega AVR - size increase, high performance use in complex operations in industry.

Why should we preferred AVR over typical 80c51/52:

        

           AVR family is faster than 80c51 family. here we get more program memory and data memory.

the comparative AVR like atmega 16/32 have more features like inbuilt ADC on low cost ,it can support inbuilt protocols like I2C,SPI which lacks in 8051 basic family .

the biggest difference is the architecture it follows RISC architecture where as 8051 follows CISC  architecture .

PWM(pulse width modulation) channels can be offered by AVR atmega 16/32. which is not by 8051.

so now we are more focused on AVR but 8051 is the most famous family do quarry about that also.👀

source code:led blinking on portc 

USE ATMEL STUDIO TO COMPILE IT.

#define F_CPU80000000UL //inbuilt crystal frequency

#include<avr/io.h>                //avr header file

#include<util/delay.h>          // inbuilt delay header

int main()

{

DDRC=0XFF;                      //portC is selected and DDR sesides direction which 1-out 0-input

while(1)                                 //infinite loop

{

    PORTC=0XFF;            //write one for out  led will get on

_delay_ms(1000);         // delay of 1sec

    PORTC=0X00;                 // disable or clear led on this port will get off

_delay_ms(1000);         //delay

}

return 0;                                //return for int type function main

}

PROTEUS SIMULATION: