What is DJNZ instruction in 8051 microcontroller? All Questions › Category: Embedded System › What is DJNZ 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 Its function Decrement and jump if not zero. Here no flags are used. A byte is a decrement and if the result is not zero it will jump to target address.