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LJMP - Long Jump; MOV - Move Memory; MOVC - Move Code Memory; MOVX - Move Extended Memory; MUL - Multiply Accumulator by B; NOP - No Operation Description. The jmp instruction transfers execution control to a different point in the instruction stream; records no return information. Jumps with The JMP instruction transfers execution to the address generated by adding the 8-bit value in the accumulator to the 16-bit value in the DPTR register. LJMP is an unconditional long jump. It is a 3-byte instruction in which the first byte is the opcode, and the second and third bytes represent the 16-bitSimilarly jump instruction is used in 8051 microcontrollers. There are three types of jump instruction in 8051. LJMP; SJMP; AJMP. LJMP ( Long Jump ):. Description: LJMP jumps unconditionally to the specified code addr. See Also: AJMP, SJMP, JMP, Instruction Set. < Click here to come back on (8051 / 8052 SJMP, LJMP, AJMP. Short jump, relative address is 8 bit it support 127 location forward, Long jump range is 64 kb, Absolute jump to anywhere within 2k block