What is the standard form of PSW?
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What is the standard form of PSW?
The program status word (PSW) is a register that performs the function of a status register and program counter, and sometimes more. The term is also applied to a copy of the PSW in storage.
What is PSW of 8085?
PSW stands for PROGRAM STATUS WORD. PSW combines accumulator A and flag register F.
How many bits are unused in PSW?
two unused bits
The program status word (PSW) register is an 8-bit register, also known as flag register. It is of 8-bit wide but only 6-bit of it is used. The two unused bits are user-defined flags….8051 Flag Bits and PSW Register.
| CY | PSW.7 | Carry Flag |
|---|---|---|
| OV | PSW.2 | Overflow Flag |
| – | PSW.1 | User definable FLAG |
What is function of PSW program status word?
program status word (PSW) A collection of information that encapsulates the basic execution state of a program at any instant. It permits an interrupted process to resume operation after the interrupt has been handled.
Which bits need to select from PSW to use Bank2 of 8051?
7. How are the bits of the register PSW affected if we select Bank2 of 8051? Explanation: Bits of PSW register are CY, AC, F0, RS1, RS0, OV, -, P so for selecting bank2 RS1=1 and RS0=0 which are fourth and third bit of the register respectively.
What is PSW of 8086?
The current state of processor is stored in a register called Processor Status Word (PSW). The PSW contains bits which indicate such things as whether the previous arithmetic operation produced a positive, negative or zero result. The 8086 microprocessor has 16-bit PSW.
What is pop PSW?
In 8085 Instruction set, with the mnemonic POP, we can pop out 2-Bytes from the top of the stack through rp i.e. register pair e.g. BC, DE, HL or AF. Here AF is a register pair formed with Flag and Accumulator registers and also known as PSW (Processor Status Word). So 4 register pairs can be mentioned with POP.
Which bits of PSW register are user definable?
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.
What is PSW register in 8051?
PSW (Program Status Word)is a 8 bit register in 8051. Its a bit addressable register having MSB bit as the carry flag which raises to 1 if there is some carry.
What is the PSW register in a microcontroller?
The program status word (PSW) register is an 8-bit register.It is also referred to as the flag register. Although the PSW register is 8 bits wide, only 6 bits of it are used by the 8051.The two unused bits are user-definable flags.
What is the difference between the 8051 and 251 variants?
The 8051 variants provide one special function register called PSW with this status information. The 251 provides two additional status flags, Z and N, that are available in a second special function register called PSW1. The following table describes the status bits in the PSW:
What is the size of the PSW register in at8951?
Among the 8051 family members, AT8951 has $k bytes of on-chip ROM having a memory address of 0000 (first location) to 0FFFH (last location). The program status word (PSW) register is an 8-bit register, also known as flag register. It is of 8-bit wide but only 6-bit of it is used.