Unconditional jump - jump instruction , Electrical Engineering

Assignment Help:

Unconditional Jump

JMP ( Unconditional Jump ) Instruction: This  instruction is used to transfer  the execution to the  specified  memory  address unconditionally ( does not check any condition before jump).  It is  normally  used to create an indefinite  loop. The  instruction format is

                            JMP 16 bit memory address

Actually it copies  the specified  memory address into the  program counter register. Hence the  microprocessor reads  the next  instruction from the address  stored in the program  counter. Now as  usual  the contains  of the  program  counter register  starts  incrementing by  one. Program executes sequentially until it encounters any other  branch  instruction.

See followings   example to  understand  the working  of JMP  instruction.

Note: You  must have noticed that Sex codes  of IN  and OUT  instruction  are written  at two  consecutive  memory  locations and Hex  codes  of JMP instruction  are written at  three  consecutive  memory  locations. Without going  into the  details of the Hex  codes and size of the instruction at this moment ( which will be  discussed later in this chapter) let us concentrate on the working  of the JMP  instruction.

In the  above program the instruction JMP  20502H will  transfer  the execution back to the first instruction which is stored  at 2050H and keep on repeating the  task by  creating  an indefinite  loop.

The  above  program may be  written  as shown  below using labels when written  using  assembler. In laboratory using microprocessor  kit one has to the hex  codes( programming techniques will be explained in detail in chapter4).

The label  represent the  memory  address of the instruction written  along with  it. In the above  program the label  START represents the  memory  address 2050H where IN  instruction is stored. It is referred  by JMP  instruction  written at memory  location 2054H.


Related Discussions:- Unconditional jump - jump instruction

Energy stored in the capacitor when it is fully charged, An 12µF capacitor ...

An 12µF capacitor is connected in series to a 0.5M? resistor across the dc voltage supply of 240V. verify: (a)  Time constant (b)  Initial charging current (c)  Time fo

Explain telephone hand set and it’s working, Q. Explain Telephone hand set ...

Q. Explain Telephone hand set and it’s working ? A standard telephone set is comprised of a transmitter, a receiver and electrical network for equalization, associated circ

inverters- recifiers and inverters, Inverters Inverter is a device w...

Inverters Inverter is a device which  converts dc power into ac  power at desired output voltage and frequency. Inverters are used in  uninterruptible power  supply  hvdc  tra

Coupling, different coupling methods

different coupling methods

Introduction to microprocessors , Normal 0 false false fals...

Normal 0 false false false EN-IN X-NONE X-NONE

Determine the voltages vx using voltage division, Q. Determine the voltages...

Q. Determine the voltages Vx using voltage division and equivalent resistor reductions for the circuits shown in Figure.

Astigmation control, Astigmation control: In most modern oscilloscopes the...

Astigmation control: In most modern oscilloscopes there is an additional focusing control marked Astigmation . This is used to correct an effect which exactly is analogous to

Illustrate breakpoint analysis, Q. Illustrate Breakpoint Analysis? When...

Q. Illustrate Breakpoint Analysis? When a circuit consists of two or more ideal diodes, it will have several distinct operating conditions resulting from the off and on states

Determine the value of voltage using offset diode model, Use the offset dio...

Use the offset diode model with a threshold voltage of 0.6 V to determine the value of v 1 for which the diode D will first conduct in the circuit of Figure(a).

Name 5 different addressing modes, The five addressing modes are given belo...

The five addressing modes are given below: Immediate, Register, Direct, Implied addressing modes           Register indirect,

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd