Question

Explain the following instruction of Micro-processor 8085 with an example:

ADD r

Answer 1

ADD r (Add Register to Accumulator) This instruction adds the content of the specified register 'r' (like B, C, D, E, H, L) to the content of the Accumulator. The result is stored in the Accumulator, and all status flags are updated.

Example:

If A = 10H and B = 05H, executing ADD B will result in A = 15H.