<< Chapter < Page Chapter >> Page >
You will learn more assembly instructions in this lab.

Typical assembly operations

Loading constants to registers

Quite often you need to load a register with a constant. The C62x instructions you can use for this task are MVK , MVKL , and MVKH . Each of these instructions can load a 16-bit constant to a register. Read and understandthe description of these instructions in the manual.

(Loading constants): Write assembly instructions to do the following:

  • Load the 16-bit constant 0xff12 to A1 .
  • Load the 32-bit constant 0xabcd45ef to B0 .

Intentionally left blank.

Register moves, zeroing

Contents of one register can be copied to another register by using the MV instruction. There is also the ZERO instruction to set a register to zero. Learn how to use these instructions byreading the appropriate TI manual pages.

Loading from memory to registers

Because the C62x processor has the so-called load/store architecture, you must first load up the content of memoryto a register to be able to manipulate it. The basic assembly instructions you use for loading are LDB , LDH , and LDW for loading up 8-, 16-, and 32-bit data from memory. (There are some variations to theseinstructions for different handling of the signs of the loaded values.) Read and understand how these instructionswork.

However, to specify the address of the memory location to load from, you need to load up another register (used as anaddress index) and you can use various addressing modes to specify the memory locations in many different ways. The addressing modes is the method by which aninstruction calculates the location of an object in memory. The table below lists all the possible different ways tohandle the address pointers in C62x CPU. Note the similarity with the C pointer manipulation.

Syntax Memory address accessed Pointer modification
*R R None
*++R R Preincrement
*--R R Predecrement
*R++ R Postincrement
*R-- R Postdecrement
*+R[disp] R+disp None
*-R[disp] R+disp None
*++R[disp] R+disp Preincrement
*--R[disp] R+disp Predecrement
*R++[disp] R+disp Postincrement
*R--[disp] R+disp Postdecrement

The [disp] specifies the number of elements in word, halfword, or byte, depending on theinstruction type and it can be either 5-bit constant or a register . The increment/decrement of the index registers are also in termsof the number of bytes in word, halfword or byte. The addressing modes with displacements are useful when a blockof memory locations is accessed. Those with automatic increment/decrement are useful when a block is accessedconsecutively to implement a buffer, for example, to store signal samples to implement a digital filter.

(Load from memory): Assume the following values are stored in memory addresses:

100h fe54 7834h 104h 3459 f34dh108h 2ef5 7ee4h 10ch 2345 6789h110h ffff eeddh 114h 3456 787eh118h 3f4d 7ab3h

Suppose A10 = 0000 0108h . Find the contents of A1 and A10 after executing the each of the following instructions.

  • LDW .D1 *A10, A1
  • LDH .D1 *A10, A1
  • LDB .D1 *A10, A1
  • LDW .D1 *-A10[1], A1
  • LDW .D1 *+A10[1], A1
  • LDW .D1 *+A10[2], A1
  • LDB .D1 *+A10[2], A1
  • LDW .D1 *++A10[1], A1
  • LDW .D1 *--A10[1], A1
  • LDB .D1 *++A10[1], A1
  • LDB .D1 *--A10[1], A1
  • LDW .D1 *A10++[1], A1
  • LDW .D1 *A10--[1], A1

Intentionally left blank.

Questions & Answers

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
Do somebody tell me a best nano engineering book for beginners?
s. Reply
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
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
Virgil
is Bucky paper clear?
CYNTHIA
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Harper
Do you know which machine is used to that process?
s.
how to fabricate graphene ink ?
SUYASH Reply
for screen printed electrodes ?
SUYASH
What is lattice structure?
s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
On having this app for quite a bit time, Haven't realised there's a chat room in it.
Cied
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
China
Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
what is the k.e before it land
Yasmin
what is the function of carbon nanotubes?
Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Berger describes sociologists as concerned with
Mueller Reply
where are the solutions?
where are the solutions?

Get the best Algebra and trigonometry course in your pocket!





Source:  OpenStax, Finite impulse response. OpenStax CNX. Feb 16, 2004 Download for free at http://cnx.org/content/col10226/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Finite impulse response' conversation and receive update notifications?

Ask