Define flag register in the 8085 microprocessor

Question

Briefly explain the flag register in the 8085 microprocessor?

Answer 1

• Flag register in 8085 microprocessor is an 8-bit register that holds 5 bit positions.
• Such five flags are of 1bit F/F and are termed as zero, carry, sign, auxiliary and parity carry.
• For sign flag when the outcome of an MSB operation is 1 then it is set else it is reset.
• The zero flag is set of the outcome of an instruction is zero.
• The auxiliary carry flag is employed for BCD operations, not open to the programmer.
• The carry flag is employed for carrying and borrowing in case of addition and subtraction operations.
• The parity flag is employed for outcomes containing an even number of one's.