By: Masud-ul-Hasan
26
PSW : Program Status Word
•CY         AC         F0         RS1         RS0        OV       ----       P
•
• - CY : Carry Flag.
• - AC : Auxiliary Carry Flag.
• - F0 : Flag 0 (available for user).
• - RS1 : Register Select 1.
• - RS0 : Register Select 0.
• - OV : Arithmetic Overflow Flag.
• - P : Accumulator Parity Flag.
• Flags are 1-bit registers provided to store the results of certain program instructions. In order to conveniently address the flags, they are grouped inside the PSW register.