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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).
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.
Why increment INR instruction in 8085 does not affect carry flag?
INR affect the carry flag.
How do you reset AC flag without affect other flags in microprocessor?
To reset the AC (Auxiliary Carry) flag in a microprocessor without affecting other flags, you can use the instruction that specifically manipulates the AC flag, such as a bit manipulation instruction or a specific flag control instruction (if available). For example, in x86 assembly, you can use the CLC instruction to clear the carry flag, but since there's no direct instruction to manipulate the AC flag alone, you might have to use a combination of logical operations or bitwise AND instructions to isolate and reset the AC flag. Alternatively, you can use a subroutine that only targets the AC flag while preserving the status of others. Always consult the specific microprocessor's documentation for the precise instructions available.
What is the flag in 8085 can't access directly?
In the 8085 microprocessor, the flag that cannot be accessed directly by the programmer is the "Auxiliary Carry Flag" (AC). This flag is primarily used for binary-coded decimal (BCD) arithmetic operations and is not directly accessible through the instruction set. While other flags like the Sign, Zero, Parity, Carry, and Auxiliary Carry can influence program control, the Auxiliary Carry is typically manipulated indirectly through specific arithmetic instructions.
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 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.
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.
Why DAD instruction only affect carry flag in 8085?
Carry
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.
Show the bit positions of various flags in 8085 flag register?
The 8085 microprocessor has 5 flags: 1. Zero flag: The zero flag is set, when the ALU operation results a zero . 2. Carry flag: If an arithmetic operations results in a carry, this flag is set. 3. Parity flag: This flag is set, when an arithmetic or logical operation results in a data, which has even number of 1s. If otherwise, it is reset. 4. Sign flag: After the execution of an arithmetic or logic operations, if D7 bit of the accumulator is 1, it indicates a negative number and this flag is set. If otherwise, it is reset. 5. Auxiliary Carry flag: used for BCD Operations, During the BCD operations, if D3 bit producing the carry then the AC bit set as1, otherwise the bit is 0. 6. Carry Flag: when a carry is generated by digit D7, then the carry flag set as 1, otherwise the bit will be 0.
How you can calculate zero flag in 8085 microprocessor?
In the 8085 microprocessor, the Zero Flag (Z) is set or cleared based on the result of an arithmetic or logical operation. Specifically, the Zero Flag is set to 1 if the result of the operation is zero; otherwise, it is cleared to 0. To calculate the Zero Flag, the microprocessor checks the result of the last executed instruction and updates the flag accordingly. This flag can be used in conditional branching to determine if further operations should be performed based on whether the result was zero.
