Unconditional Jump Instruction in 8085 Microprocessor

In 8085 Instruction set,there are a set of jump instructions, which can transfer programcontrol to a certain memory location. So after these branchingmnemonics we shall have to mention 16-bit target address of thelocation. These jump instructions can be divided into two categories– 

• Unconditional jump instructions and

• Conditional jump instructions

Here in this section we shall discuss only the unconditional jump instruction. Tre required mnemonic is JUMP a16. Here in this instruction a16 denotes 16-bit memory location address.This instruction does not depend on the current conditions of theflag bits in the flag register. It is a 3-Byte instruction. The firstByte will contain the opcode of the instruction and the second andlast Byte will contain low-order Byte and high-order Byte of theinstruction. Here is the mnemonic details – 

The following table shows the JUMP Branching instructions with their meanings.

Let us consider the following program segment –

The timing diagram against this instruction JMP 4000H execution is as follows –

Summary − So this instruction JMP requires 3-Bytes, 3-Machine Cycles (Opcode Fetch, Memory Read, MemoryRead) and 10 T-States for execution as shown in the timing diagram.