Electronics and Communication Engineering - Microprocessors - Discussion

In the 8085 microprocessor, the flag register has five status flags and one control flag.

The status (sign) flags are:

- Sign (S) – indicates the sign of the result (MSB).

- Zero (Z) – set if result is zero.

- Auxiliary Carry (AC) – used in BCD arithmetic (carry from bit 3 to bit 4).

- Parity (P) – set if result has even parity.

- Carry (CY) – set if there is a carry/borrow out of MSB.

And the control flag is:.

- Trap (T) – used for enabling the trap interrupt.

So, strictly speaking, 8085 has 5 status flags (often called condition flags) and 1 control flag, making a total of 6 flags.

Answer: 8085 has 5 sign/status flags + 1 control flag = 6 flags in total.

Can anyone explain me clearly?

Basically 8085 consists of 5 flags. I.e.,
1.carry
2.parity
3auxillary carry
4.Zero
5.sign.

So, in this sign flag is one type of flag. It doesn't consists any other types of flags.

@Rahul.

5085 has one sign flag ie s-flag.

How? Explain in detail.

It has only 5 flags.

They are,
1. Sign flag
2. Zero flag.
3. Parity flag.
4. Carry flag.
5. Auxillary carry.

The flag register in 8085 is an 8-bit register which contains 5-bit positions.
These five flags are of 1bit F/F and are known as zero, SIGN, carry, parity and auxiliary carry. For sign flag, if the result of an MSB operation is 1 then it is set else it is reset.

Five sign flags in 8085.

Why? Give me the reason.

Please give the name of 8085 sign flag.