STA: –
the content of accumulator are copied into the memory location
. … STAX(Store accumulator indirect): – The contents of the accumulator are copied into the memory location specified by the contents of the operand (register pair). The contents of the accumulator are not altered.
What is the function of STA addr instruction?
In 8085 Instruction set, STA is a mnemonic that stands for STore Accumulator contents in memory. In this instruction,Accumulator8-bit content will be stored to a memory location whose 16-bit address is indicated in the instruction as a16. This instruction uses
absolute addressing for specifying the destination
.
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.
What is Stax instruction?
In 8085 Instruction set, STAX is
a mnemonic that stands for SToreAccumulator contents in memory pointed by eXtended register denoted as “
rp”. … So using this instruction, the current content of Accumulator will be written to the memory location as pointed by 16-bit address as stored in the register pair.
What is Sta command?
The STA command
brings the entire STA environment up or down and can provide a status as well
. It also checks to see if a particular service is already in the state that you are attempting to move to and informs you if it is already in that state.
What does LDA instruction do?
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 full form of LDA?
| Full Form Category Term | Local Delivery Agent Networking LDA | Local Director Acceleration Networking LDA | LIDHORA KHURD Indian Railway Station LDA | Lithium Diisopropylamide Chemistry LDA |
|---|
Which addressing mode is used by STA 2000H?
In immediate addressing mode the data itself is specified within instruction, but in
direct addressing mode
the address of the data is specified in the instruction. the contents of accumulator are stored in memory location 2000H.
What is MOV a M?
In 8085 Instruction set, MOV r, M is an instruction where the
8-bit data
content of the memory location as pointed by HL register pair will be moved to the register r. … It occupies only 1-Byte in memory. MOV E, M is an example instruction of this type. It is a 1-Byte instruction.
Is accumulator a special purpose register?
Special Purpose Registers. … An accumulator is
a register for short-term, intermediate storage of arithmetic and logic data in a computer’s CPU
(Central Processing Unit). In an arithmetic operation involving two operands, one operand has to be in this register.
How does SBB instruction work?
SBB is a mnemonic that stands for ‘SuBtract with Borrow’ and ‘R’ stands for any of the following 7 registers, and also memory location M as pointed by HL register pair. This instruction is used
to compute subtraction between contents of R register
from the Accumulator’s content, along with the carry (borrow) value.
What is use of MVI instruction?
MVI is a mnemonic, which actually means “Move Immediate”. With this instruction,we can load a register with an 8-bitsor 1-Bytevalue. This instruction supports
immediate addressing mode for specifying the data in the instruction
.
Which of the following register pair of 8085 is not accepted in LDAX instruction?
This rp can be either BC register pair represented by B or DE register pair represented by D. Note that
LDAX H
is not provided in 8085 instruction set. This is because, LDAX H is the same as MOV A, M in its function.
What is the function of LXI H 8000 H?
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.
What is the output of LXI H 2050H?
LXI H,2050H L=
50H H=20H
LXI instruction takes 3 bytes of memory and 10 clock periods.
How many machine cycles are required by STA instruction?
STA address
It requires
4 Machine cycles
.
