| S.No. MNEMONICS COMMENT | 1 MVI A, 00 A <- 00 | 2 ANI 00 A AND 00 | 3 XRA A A XOR A | 4 SUB A A <- A – A |
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Which instruction stands for clear accumulator?
In 8085 Instruction set, STA is a mnemonic that stands for STore Accumulator contents in memory. In this instruction, Accumulator 8-bit content will be stored in a memory location whose 16-bit address is indicated in the instruction as a16.
What are the ways to clear the accumulator?
| S.No. MNEMONICS COMMENT | 1 MVI A, 00 A <- 00 | 2 ANI 00 A AND 00 | 3 XRA A A XOR A | 4 SUB A A <- A – A |
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Which instruction clears the accumulator Mcq?
04. Which one of the following instruction may be used to clear the accumulator content irrespective of its initial value? There is no such instruction like CLRA and MOV A, 00H. There is no guarantee that ORA A will result in zero but we can be sure SUB A will reset or clear the content of accumulator.
Which does not clear the accumulator?
This discussion on The instruction, that does not clear the accumulator of 8085, isa)XRA Ab)ANI 00Hc)MVI A, 00Hd)None of the aboveCorrect answer is option ‘ D ‘.
How do you clear an accumulator in 8051?
| Operation: CLR | Function: Clear Register | Syntax: CLR register |
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What do you know about accumulator?
An accumulator is a register for short-term, intermediate storage of arithmetic and logic data in a computer’s CPU (central processing unit) . ... The numerical value in the accumulator increases as each number is added, exactly as it happens in a simple desktop calculator (but much faster, of course).
What is the purpose of accumulator register?
An accumulator is a type of register included in a CPU. It acts as a temporary storage location which holds an intermediate value in mathematical and logical calculations . Intermediate results of an operation are progressively written to the accumulator, overwriting the previous value.
Is accumulator a 16-bit register?
All microprocessors make use of an accumulator register that can supply one number for an action, and where the result of an action will also be stored. The size of the accumulator in terms of bits is used as a measure of the data unit capability of the microprocessor (as 8-bit, 16-bit, 32-bit, 64-bit, and so on).
Which interrupt has lowest priority?
Explanation: The interrupt, RI=TI (serial port) is given the lowest priority among all the interrupts.
Which register pair is used to indicate memory?
H and L register pair is used to act as memory pointer and it holds 16 bit address of memory location.
What happens when halt instruction is used?
The HALT instruction suspends CPU operation until a interrupt or reset is received . While in the halted state, the processor will execute NOP’s to maintain memory refresh logic.
What will be the content of accumulator after execution of XRA A?
In 8085 Instruction, XRA is a mnemonic that stands for “eXclusive OR Accumulator” and “R” stands for any of the following registers, or memory location M pointed by HL pair. R = A, B, C, D, E , H, L, or M. This instruction is used to Ex-OR contents of R with the Accumulator. ... It occupies only 1-Byte in memory.
Is a 3 byte instruction?
Three-byte instructions –
Three-byte instruction is the type of instruction in which the first 8 bits indicates the opcode and the next two bytes specify the 16-bit address . The low-order address is represented in second byte and the high-order address is represented in the third byte.
Which one of the following is both positive edge and level triggered interrupt?
TRAP is both level and edge sensitive triggered.
What is an accumulator in electricity?
An accumulator is a functionally rechargeable device that is used for harnessing electrical energy stored in the form of chemical energy . Accumulators typically consist of one or more separate cells depending on the amount of energy they are required to store and/or dispense.
