need some ideas on how i can add two binary inputs using the P16F84A rb port as an input of the two binary ....interrupt is enable using rbo...rb1, rb2, rb3 are inputs for the first binary while rb4,rb5,rb6 and rb7 for the input of the second binary...the result of the sum will be shown using porta (rbo-rb3) as the output..each time an interrupt occurs the result of the addition will be displayed...thanks.