What is ADD instruction in 8051 microcontroller? All Questions › Category: Embedded System › What is ADD instruction in 8051 microcontroller? 0 Vote Up Vote Down Chetan Shidling Staff asked 5 years ago I need short information. 1 Answers 0 Vote Up Vote Down Chetan Shidling Staff answered 5 years ago ADD This adds the source byte to the accumulator(A) and assigns the result in A. This instruction is practiced for both signed and unsigned numbers. Example: MOV A, #22H ADD A, #69H