Table of Contents
Which instructions can clear the accumulator?
SUB A is another one-byte instruction. It subtracts accumulator value from the accumulator. The XRA A and SUB A both are one-byte instruction, but as XRA A is logical, it performs faster than the other. So XRA A is best for clearing/resetting Accumulator content than other three instructions.
Which instruction is not used for clear the accumulator?
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 of the following instructions change the content of accumulator?
In an 8085 microprocessor, which one of the following instructions changes the content of the accumulator? SBI: – Substract immediate from the content of the accumulator and the result is stored in accumulator. It is one of the general purpose register of microprocessor also called as A register.
What is the meaning of Jnz instruction?
Jump if Not Zero
Microprocessor8085. In 8085 Instruction set, we are having one mnemonic JNZ a16, which stands for “Jump if Not Zero” and “a16” stands for any 16-bit address. This instruction is used to jump to the address a16 as provided in the instruction.
How many instructions are used to clear content of accumulator?
Solution – There are 4 instructions to reset the accumulator in 8085.
Which of the following instruction is only used for accumulator?
Here, only SBI BEH is an arithmetic operation. The instruction adds the content of accumulator with data BE H and stores the result in accumulator.
How do you clear an accumulator in 8051?
Description: CLR clears (sets to 0) all the bit(s) of the indicated register. If the register is a bit (including the carry bit), only the specified bit is affected. Clearing the Accumulator sets the Accumulator’s value to 0….8051 / 8052 Microcontroller. Instruction Set. CLR – Clear Register.
| Operation: | CLR |
|---|---|
| Function: | Clear Register |
| Syntax: | CLR register |
Are push and pop instructions are a type of call instruction?
Explanation: PUSH and POP instructions are not CALL instructions because in POP and PUSH instructions the pointer does not move to any location specified by its address which is the fundamental of CALL instruction, so it is not a type of CALL instruction.
What is DJNZ instruction?
The DJNZ instruction decrements the byte indicated by the first operand and, if the resulting value is not zero, branches to the address specified in the second operand.
What is Xri instruction?
In 8085 Instruction set, XRI is a mnemonic that stands for “eXclusive OR Immediate with Accumulator” and “d8” stands for any 8-bit data. This instruction is used to Ex-OR 8-bit immediate data with the Accumulator. The result of Ex-ORing will be stored in the Accumulator overwriting its previous content.
Which of the following 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.