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What is LDAX instruction?
In 8085 Instruction set, LDAX is a mnemonic that stands for LoaD Accumulator from memory pointed by eXtended register pair denoted as “rp” in the instruction. This instruction uses register indirect addressing for specifying the data.
What is LXI H in microprocessor?
These instructions are used to load the 16-bit address into the register pair. We can use this instruction to load data from memory location using the memory address, which is stored in the register pair rp. For an example, if the instruction is LXI H, FE50. It means that the FE50 is loaded into the HL register pair.
Which register pair of 8085 is not accepted in LDAX instruction Mcq?
Which register pair of 8085 is NOT accepted in LDAX instruction? In 8085, the numbers 45H and 7EH are added.
What is the operation of INX H instruction?
Microprocessor8085. In 8085 Instruction set, INX is a mnemonic that stands for “INcrementeXtended register” and rp stands for register pair. And it can be any one of the following register pairs. rp = BC, DE, or HL. This instruction will be used to add 1 to the present content of the rp.
How does LDA instruction work?
In 8085 Instruction set, LDA is a mnemonic that stands for LoaD Accumulator with the contents from memory. In this instructionAccumulatorwill get initialized with 8-bit content from the 16-bit memory address as indicated in the instruction as a16. This instruction uses absolute addressing for specifying the data.
What is the meaning of VXI LXI VXI ZXI?
Varun | 2 years ago. Lxi means basic petrol version ,vxi means middle version and zxi means top end petrol version model.
What is LDA and STA?
STA is for copying data from accumulator to memory location, LDA is for copying data from memory location to accumulator and. MOV is for copying data between registers plus registers and memory.
Which flag is not present in 8085?
However, in our 8085 instruction set does not provide any instruction, which explicitly uses the AC flag. Sign flag (S): The S flag is set to 1, when the result thus produced against any logical or arithmetic operations is negative, indicated by MS bit of 8-bit result being 1.
What does the instruction dad H stand for?
Here, DAD is a mnemonic, which stands for Double ADd and also rp stands for any one of the following register pairs as mentioned below. rp = BC, DE, or HL. As rp can have any of the three values, there are three opcodes for this type of instruction. It occupies only 1-Byte in memory. Mnemonics, Operand.
What does LDAX mean in the 8085 instruction set?
In 8085 Instruction set, LDAX is a mnemonic that stands for LoaD Accumulator from memory pointed by eXtended register pair denoted as “rp” in the instruction. This instruction uses register indirect addressing for specifying the data.
Why is LDAX H the same as MOV a, m?
This is because, LDAX H is the same as MOV A, M in its function. Let us consider, LDAX B as an example instruction of this type. As It is a 1-Byte instruction so it will occupy 1-Byte in the memory. Let us suppose that the initial content of BC register pair is 4050H and at memory location 4050H is having the 8-bit content of ABH.
How to execute DAA in an 8085 microprocessor?
Let the content of register A is 98H. Both Auxiliary Carry flag and Carry flag are set i.e. AC=1 & Cy=1. If now I execute DAA once, both nibbles will get added with (0110) and the result is FEH having AC=0 & Cy=0.
Which is the instruction type for LDAX RP?
LDAX B and LDAX D are the instructions available but instructions like LDBX rp, LDCX rp etc. are not available. As Accumulator is the most important 8-bit register, so we have been restricted to use with LDAX rp instruction only.