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The TI TMS320C54x microprocessor provides a number of ways to specify the location of data to be used in calculations. Immediate addressing, direct addressing, and indirect addressing are the three main types. Knowing the basic addressing modes of a microprocessor is important because they map directly into assembly language syntax and because the need to use a particular addressing mode often dictates which instruction one picks for a given task.

Microprocessors provide a number of ways to specify the location of data to be used in calculations. For example, one of thedata values to be used in an add instruction may be encoded as part of that instruction's opcode , the raw machine language produced by the assembler as it parses yourassembly language program. This is known as immediate addressing . Alternatively, perhaps the opcode will instead contain a memory address which holds the data( direct addressing ). More commonly, the instruction will specify that an auxiliary register holds the memory addresswhich in turn holds the data ( indirect addressing ). The processor knows which addressing mode is being used byexamining special bit fields in the instruction opcode.

Knowing the basic addressing modes of your microprocessor is important because they map directly into assembly languagesyntax. Many annoying and sometimes hard-to-find bugs are caused by inadvertently using the wrong addressing mode in aninstruction. Also, in any assembly language, the need to use a particular addressing mode often dictates which instruction onepicks for a given task.

Chapter five, Data Addressing , in the CPU and Peripherals reference contains extended descriptions of most of the addressing modes described below.

Accumulators: src, dst

Whenever the abbreviations src or dst are used in the assembly language syntax description for an instruction, it means that only theaccumulators A and B may be used for that particular operand. These are seen everywhere, but twoclassic examples are ld , which always loads data into an accumulator from somewhere else, and sth/stl , which always store data from an accumulator to somewhere else.

Examples:

ld *AR5,A ; sets A = (contents of memory location pointed to by AR5) sth B,*AR7+ ; sets (contents of memory location pointed to be AR7) = B, ; and then increments AR7 by one

Memory-mapped registers: mmr, mmrx, mmry

Many of the TMS320C54x registers are memory-mapped, meaning that they occupy real addresses at the low end of data memoryspace. The most commonly used of these are the auxiliary registers AR0 through AR7 . Whenever the abbreviation MMR is used in the assembly language syntax description for an instruction, it means thatany memory-mapped register may be used for that particular operand. Only eight instructions use memory-mapped registeraddressing: ldm , mvdm , mvmd , mvmm , popm , pshm , stlm , and stm . With mvmm , since the instruction accepts two memory-mapped register operands, MMRx and MMRy , only AR0 - AR7 and SP may be used.

Questions & Answers

what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
Daniel
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Maciej
characteristics of micro business
Abigail
for teaching engĺish at school how nano technology help us
Anassong
How can I make nanorobot?
Lily
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
NANO
how can I make nanorobot?
Lily
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
s.
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
Tarell
what is the actual application of fullerenes nowadays?
Damian
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
Tarell
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Dsp laboratory with ti tms320c54x. OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10078/1.2
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