Full Form of PSW in Microprocessor

Program Status Word is the official name for PSW. The program status word, or PSW, is an 8-byte or 64-bit collection of information that the operating system keeps track of. It records the system's condition as it is right now. The PSW displays the overall health of your system.

It is essentially a group of data that captures the fundamental executive status of a program at any one time. Once the interruption has been dealt with, it enables an interrupted process to continue running. the supervisor's privileged status information is also kept in the program status register together with bits showing the status of other ALU situations, such as overrun and transfer, and the value of the program counter.

System PSWs come in six different varieties and offer diagnostic data. Both old and new values exist for each. These are the PSWs:

• Restart
• External
• Program
• Machine check
• Supervisor call
• Input/ output

What Does PSW Mean in the 8085 Microprocessor?

A register named Processor Status Word stores the processor's current condition (PSW). The PSW has bits that, among other things, show whether the outcomes of the preceding arithmetic operations were positive, negative, or zero. A branch will be taken if a subtraction instruction is followed by a "section on zero" command and the PSW indicates that the result of the subtraction was a zero. The result is compared with the limit each time the counter is altered, the PSW is set appropriately, and the branch is taken or not depending on the information in the PSW. The PSW on the 8086 microprocessor is 16 bits. Seven of the bits in this PSW, known as flags, are not utilized. Control flags and condition flags are two categories for the nine flags.

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