Which type of instruction is MVI?

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 instructions move data to accumulator?

8085 Data-transfer Instructions

Which instructions clears 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.

Is accumulator a special purpose register?

Special Purpose Registers. (a) Register A(Accumulator) – Register A is an 8-bit register used in 8085 to perform arithmetic, logical, I/O & LOAD/STORE operations. Register A is quite often called as an Accumulator. And the result of the arithmetic operation will be stored or accumulated in this register.

Which instruction copies value from memory to accumulator?

LDAX instruction copies the contents of that particular memory location into the accumulator register.

Which of the following instructions will move the contents of register 3 to the accumulator MOV 3r A MOV R3 a mov a R3 MOV a 3r?

Detailed Solution

• The Data Transfer Instructions are associated with the transfer of data between registers or external program memory or external data memory.
• ​Hence the instruction to move the contents of register 3 to the accumulator will be:
• MOV A, R3.
• So option (1) is the correct answer.
• Important Points.

Which instruction does not clear 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.

How do you clear an accumulator on 8085?

Solution – There are 4 instructions to reset the accumulator in 8085….Reset Accumulator (8085 & 8086 microprocessor)