Flags Practice

CF (Carry Flag)

When we have two 8-bit numbers in a calculation, and the result is more than 8 bits (9 for example) than the carry flag is 1 If we have two 16-bit numbers in a calculation, and the result is more than 16 bits (17) than the carry flag is 1

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ZF (Zero Flag)

When the result is 0, zero flag is 1

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SF (Sign Flag)

If the result in a calculation has the MSB (most significant bit) 1, than the sign flag is 1. If we have a carry flag up, a bigger result than 8-bit, the carry flag does not determine the sign flag, the sign flag is 1 only if the msb of the 8-bit is 1.

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Overflow Flag

This flag is up if in a calculation, the MSB of the first number is different than the result MSB.

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Parity Flag

If the number of 1s in the result is paired (2, 4, 6, 8) the flag is up If we have 16-bit situation, the Least significant byte is looked (last 8 bits)