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

Transformer-coupled amplifiers, Q. Transformer-coupled Amplifiers? Tra...

Q. Transformer-coupled Amplifiers? Transformer-coupled Amplifiers: The figure illustrates another type of coupling often used to couple audio frequencies - the untuned transf

permanent magnet stepper motor - stepper motor , Normal 0 fa...

Normal 0 false false false EN-IN X-NONE X-NONE   Permanent   Magnet Stepper Motor The s

Structure of bipolar junction transistor, Structure of Bipolar junction tra...

Structure of Bipolar junction transistor:  A BJT contains three differently doped semiconductor regions that are: emitter region, base region and collector region. These regio

Database resources, HELLO.can I have a short note on database resources

HELLO.can I have a short note on database resources

Calculate the small signal voltage gain, Calculate the Small Signal Voltage...

Calculate the Small Signal Voltage Gain a) Calculate the small signal voltage gain a v = v o /v i , input resistance R i , and output resistance Ro for the circuit below. A

Explain the term- electronic mail, Explain the term- Electronic Mail (email...

Explain the term- Electronic Mail (email) Another form of communication is through email. This has the below advantages over video conferencing: -  There are no language pro

Explain loop instructions in 8086 family, Explain LOOP instructions in 80...

Explain LOOP instructions in 8086 family with example and their effect on flag. LOOP: (Jump to given label until CX = 0) it is used to repeat a sequence of instructions for

Bipolar junction transistor, Bipolar junction transistor: Transistors ...

Bipolar junction transistor: Transistors are so named as they conduct via using both majority and minority carriers. The bipolar junction transistor that is abbreviated as BJT

Obtain the time domain functions, Let ω = 2π × 60 rad/s corresponding to a ...

Let ω = 2π × 60 rad/s corresponding to a frequency of 60 Hz. (a) Consider v(t) = 100 √2 cos(ωt + 30°) V and i(t) = 10 √2 sin(ωt + 30°) A. Find the corresponding phasors ¯V and ¯

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