PSW (Program Status Word)

PSW (Program Status Word) Definition

The Intel 8085 microprocessor contains 5 flip-flops to serve as status flags which are indicated by five bits and three bits are undefined. The combination of these 8 bits is known as Program Status Word. Both, PSW and accumulator are treated as a 16-bit unit for stack operations.

Five status flags are:

  • Carry Flag (CS)
  • Parity Flag (P)
  • Auxiliary carry Flag (AC)
  • Zero Flag (Z)
  • Sign Flag (S)
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