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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

anyone know any internet site where one can find nanotechnology papers?
Damian Reply
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.
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
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
characteristics of micro business
for teaching engĺish at school how nano technology help us
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
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
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.
what is the actual application of fullerenes nowadays?
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.
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.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
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.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Berger describes sociologists as concerned with
Mueller Reply
where are the solutions?
where are the solutions?

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Source:  OpenStax, Finite impulse response. OpenStax CNX. Feb 16, 2004 Download for free at http://cnx.org/content/col10226/1.1
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