AVR ATMEGA16 MICRO CONTROLLER

AVR is 8 bit micro-controller.
ATMEGA16 Registers

Registers: (x - A/B/C/D)
   DDRx - data direction register
       DDRx = 0xFF;     //output register
       DDRx = 0x00;     //input register

PORTx
       PORTx = 0xFF;   //set all pins high of x port
       PORTx = 0x00;   //reset all pins low
       PORTx.0 = 0x00;      //change only 0th pin of port x


PINx   Port IN
Used to read port data. but port direction must be INPUT.

      x = PINx;            //read port
      or
      x = PINx.0;        //read a ports pin


Reverse a Port
PORTx = ~PORTx;