Using Atmel Studio 7.0 to write a program display three numbers in binary (4 bits). In that: Port A0 A3: display number A. Pin A4 is button to count up. Pin A5 is button to count down, Pin A6 is button to save the value of number A Port BO B3 :: display number B. Pin B4 is button to count up, Pin B5 is button to count down, Pin B6 is button to save the value of number B Port DO D3: display result of calculation between A and B Pin D4 is button to ADD A and B Pin D5 is button to SUBTRACT A and B