Question

what is the boolean expression for overflow..?

Answer 1

dear as i know it's depend on the hardware u use . each hardware has an overflow flag . and overflow flag indicate an one in statues word .

Answer 2

if i consider a microcontroller 8051,when the register has a overflow,the overflow flag bit sets.What is the internal arrangement for that..? what is the circuit for that...?

Answer 3

If you're adding 2 signed numbers and the resulting number is too large to store in the register, the overflow flag is triggered. The boolean expression for overflow concerning the addition of such numbers is as follows:

overflow = the carry in for the most significant bit OR'd with the final carryout.

This can look like ovf = c2+cout, depending on the variables you choose to represent the integers.