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What are the various flags used in 8085?
there are 5 flags of intel 8085 are: Carry flag(CY), parity flag(P), Auxiliary Carry flag(AC), Zero Flag(Z), Sign flag(S).
Why increment INR instruction in 8085 does not affect carry flag?
INR affect the carry flag.
Why DAD instruction only affect carry flag in 8085?
Carry
Show bitwise psw of 8085 and 8086 and explain the function of each flag with an example?
The Program Status Word (PSW) for the 8085 and 8086 microprocessors consists of various flags that indicate the status of operations. In the 8085, the flags include the Sign Flag (S), Zero Flag (Z), Auxiliary Carry Flag (AC), Parity Flag (P), and Carry Flag (CY). For example, if an operation results in a negative value, the Sign Flag is set, while if the result is zero, the Zero Flag is set. In 8086, the PSW includes similar flags but adds the Overflow Flag (OF), which indicates an overflow in signed arithmetic operations.
What is the use of AC Flag in 8085?
The Auxiliary Carry (AC) flag in the 8085 indicates a carry out of the low order 4 bits of an operation, more specifically that the low order 4 bits are greater than 9 (10012). The AC flag can thus be used to facilitate decimal arithmetic.
What is the function of processor status word in 8085?
Processor status word ( PSW ) in the case of 8085 refers to the collection of the values of the flag register and accumulator. It is used with the command push: PUSH PSW With this command, the proccessor saves the value of accumulator (A) and the values of the flag bits to the stack.
What are the status flags in 8085?
In the 8085 microprocessor, the status flags are specific bits in the flag register that indicate the outcome of arithmetic and logical operations. There are five main flags: the Sign Flag (S), Zero Flag (Z), Auxiliary Carry Flag (AC), Parity Flag (P), and Carry Flag (CY). The Sign Flag indicates the sign of the result, the Zero Flag indicates if the result is zero, the Auxiliary Carry Flag is used for BCD operations, the Parity Flag indicates if the number of set bits is even or odd, and the Carry Flag indicates an overflow in arithmetic operations. These flags are essential for decision-making in program execution and control flow.
Why do you need a flag?
you cant answer.
What are the flags affected by ALU in 8085 Explain briefly?
In the 8085 microprocessor, the Arithmetic Logic Unit (ALU) affects five flags in the status register: Sign Flag (S), Zero Flag (Z), Auxiliary Carry Flag (AC), Parity Flag (P), and Carry Flag (CY). The Sign Flag indicates the sign of the result; the Zero Flag is set if the result is zero; the Auxiliary Carry Flag is used for BCD operations; the Parity Flag indicates whether the number of 1s in the result is even or odd; and the Carry Flag indicates an overflow in arithmetic operations. These flags help in decision-making for subsequent operations and control flow in programs.
What is dad and what are the flags affected by dad in 8085?
In the 8085 microprocessor, DAD (Double Add) is an instruction that adds the contents of a specified 16-bit register pair (HL, BC, or DE) to the contents of the accumulator (A) and stores the result back in the 16-bit register pair. The flags affected by the DAD instruction are the Carry flag (CY) and the Parity flag (P). The Zero flag (Z) and Sign flag (S) remain unaffected. Additionally, the Auxiliary Carry flag (AC) is also not affected by this operation.
What is the effect of operating different instruction on psw in 8085?
In the 8085 microprocessor, the Program Status Word (PSW) contains important flags that reflect the state of the processor. Different instructions can affect these flags, such as the Zero Flag, Sign Flag, Carry Flag, and Parity Flag. For example, arithmetic operations like addition or subtraction can set or reset these flags based on the result of the operation. Consequently, the PSW is essential for conditional branching and decision-making within programs, as it provides the necessary status information determined by the executed instructions.
Explain the roles of registers in programming?
A register is a temporary high speed storage location for some data, usually contained in the processor's internal hardware design. The accumulator, A in the 8085, has special significance as it can be the target of most arithmetic and logical manipulation instructions. Other registers, such as B in the 8085, can hold temporary values useful during a computation. Some registers, such as HL in the 8085, can hold addresses of memory operands. Special registers, such as SP or PC in the 8085, hold the stack pointer or program counter. Sometimes, internal registers, such as TEMP in the 8085, are used in the internal design of the computer, but they are not directly accessible to the program. Sometimes, registers are combined, such as B and C being treated as one value, BC, in the 8085. This is a case of a 16 bit register. Last, status registers, such as FLAGS in the 8085, hold various things related to processor status, such as the carry flag or various interrupt masks, but they are not generally treated as arbitrary storage of data.
