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The AVR is a modified Harvard architecture 8-bit RISC single chip microcontroller which was developed by Atmel in 1996. The AVR was one of the first microcontroller families to use on-chip flash memory for program storage, as opposed to One-Time Programmable ROM, EPROM, or EEPROM used by other microcontrollers at the time.
As simple program Atmega8 using led coding
/* LED BLINKING ON AND OFF */
#include<avr/io.h>
#include<utily/delay.h>
int main( )
{
DDRB = 0XFF;
while (1)
{
PORTB = 0XFF; //portb all pins is high
_delay_ms(5);
PORTB = 0X00; //portb all pins is off
_delay_ms(5);
}
}
/* switch status which is connected to PB0 .If PB0 is high glow led else switch off led
#include<avr/io.h>#include<util/delay.h>void init_ports(void){DDRB=0X00;DDRC=0XFF;}int main(){init_ports();while(1){if(PINB&0X01){PORTC=0XFF;_delay_ms(5);}else{PORTC=0X00;_delay_ms(5);}}return 0;}
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