0
Because that is the way Intel designed the INX instruction of the 8085. The 8080 is also the same. INX increments (and DCX decrements) the 16 bit register pairs or BC, DE or HL, depending on what register pair you specify in the INX (or DCX) instruction. To check is the value is 0 after an INX (or DCX) instruction, you need to OR the values of the register pair into the A register. For example.....
INX H ;increment HL register pair
MOV A,H ; move H register into the accumulator
ORA L ; Logical OR it with the L register
JZ ADDR ; If 0 then jump to ADDR
What else can I help you with?
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 importance of flags in microprocessor?
sign flag parity flag zero flag
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.
What is CMP in 8085 microprocessor?
In the 8085 microprocessor, CMP (Compare) is an instruction used to compare the contents of the accumulator (register A) with another specified register or memory location. It effectively subtracts the value of the specified operand from the accumulator but does not store the result; instead, it sets the status flags (zero, carry, and sign) based on the outcome of the comparison. This allows for conditional branching in programs, as the results can be used to determine the flow of execution. The CMP instruction helps in decision-making processes within the microprocessor's operation.
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).
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 instruction for make content of accummulator zero in 8085?
Sub a ani 00h xra a
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.
Explain different types of flags in 8085 microprocessor?
Flags are microprocessor dependent. ie flags are different for different microprocessors. Flag represents the status ( & Type) of the operation performed. Ex: In terms of 8085 we have 5 flags : Zero, Carry, Ac Carry, Parity, Sign Flag register is of 8 bits in this case. These flags can also be used for logic implementation.
ADD instruction of 8085?
The ADD instruction in the 8085 microprocessor is used to add the contents of a specified register or memory location to the accumulator (register A) and store the result back in the accumulator. It can be used with registers like B, C, D, E, H, and L, or with a memory address specified. The operation affects the flags in the status register, reflecting conditions such as zero, carry, and parity. The instruction takes 1 byte and 1 machine cycle to execute.
Will DCX instruction affect the zero flag?
no....it does not aff
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.
