Are All The Bits Of Flag Register Used In 8051?

1.	Are All The Bits Of Flag Register Used In 8051?
Answer» The flag register also called as the program status word uses only 6 bits. The two UNUSED bits are user definable flags. CARRY, auxiliary carry, PARITY and OVERFLOW flags are the conditional flags used in it. 1 is a user definable bit and PSW.5 can be used as general purpose bit. Rest all flags indicate some or the other condition of an ARITHMETIC operation.

Answer»

The flag register also called as the program status word uses only 6 bits.
The two UNUSED bits are user definable flags.
CARRY, auxiliary carry, PARITY and OVERFLOW flags are the conditional flags used in it.
1 is a user definable bit and PSW.5 can be used as general purpose bit.
Rest all flags indicate some or the other condition of an ARITHMETIC operation.

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