Question

Which of the data transfer is not possible in 8085 microprocessor ?



a.Memory to accumulator



b.Accumulator to memory



c.Memory to memory



d.I/o device to accumulator?

Answer 1

C option Memory to memory

Answer 2

Answer:

c) Memory to memory

Explanation:

In Memory Direct Addressing Mode the data transfer between memory-to-memory is not possible.

In the microprocessor, most of the instruction sets allow one register operand or one memory operand, and format of this structure makes designing the instruction decoder easier. It makes the execution engine inside the Central processing unit easier, because the instruction can issue in their memory location, and register block read or write.

In memory-to-memory instruction directly requires two memory locations. This is difficult to handle given a register/memory instruction format.