<< Chapter < Page Chapter >> Page >

For our purposes, the CPL bit is set and so we will use SPH/SP for direct addressing. SP is initialized for you in the core file and should not need to be modified. SP-referenced direct addressing is used by the psh and pop instructions for stack manipulation, as well as by all subroutine calls and returns, which save program addresses on the stack.


; Assuming SPH = 0, SP = FF00h, MOV *SP(5) , T2 ; T2 = value at location 00FF05h ; Assuming DPH = 3, DP = 0 MOV @0005h, T2 ; T2 = value at location 030005h ADD *SP(6), AC0 ; AC0 = AC0 + (contents of memory location SPH:SP+6)

Absolute addressing: *abs16(#k16), *(#k23)

This seems to be TI's term for all the forms of direct addressing which it does not call direct addressing! There are three types of adsolute addressing : k16, k23, and I/O. We will only be using the first two. It isrepresented in assembly-instruction syntax-definitions using one of the above abbreviations ( *(lk) addressing is available when the syntax definition says Smem or Lmem ).


k16 absolute addressing uses the operand *abs16(#k16) along with the 7-bit DPH to form a 23-bit address.


; Assuming DPH = 3 MOV *abs16(#2002h), T2 ; T2 = value at address 032002h


k23 absolute addressing uses the operand *(#k23) as a 23-bit address.


MOV *(#032002h), T2 ; T2 = value at location 032002h MOV AR1, *(#hold) ; sets (storage location at hold) = AR1

Indirect addressing: smem, lmem, xmem, ymem, cmem

Indirect addressing on the TMS320C55x uses the auxiliary registers AR0 through AR7 and the CDP . They can be used in place of Smem/Lmem or Xmem/Ymem .

Ar indirect: smem/lmem

In Smem/Lmem indirect addressing, only one indirect address is used int he instruction and a number of variations is possible (see the table on page 6-39 of the CPU Reference guide). An asterisk is always used, which usually signifies indirect addressing. Any of the registers AR0 - AR7 may be used, with optional modifications: automatic post-decrement by one, pre- and post-increment by one, post-increment and post-decrement by n ( n being stored in T0, T1, or AR0), and more, including many options for circular addressing (which automatically implements circular buffers) and bit-revered addressing (which is useful for FFTs).

Dual ar indirect: xmem/ymem

Xmem/Ymem indirect addressing is generally used in instructions that need two different indirect addresses,although there are a few instances where an Xmem by itself is specified in order to save bits in the opcode for other options. In Xmem/Ymem indirect addressing, fewer bits are used to encode the option modifiers in the opcode; hence,fewer options are available: post-increment by one, post-decrement by one, and post-increment by AR0 , T0 , or T1 with circular addressing.

ADD Xmem, Ymem, ACx ADD *AR1+, *AR2+, AC0 ; Add values stored in memory locations referenced by ; AR1 and AR2 and store result in AC0. ; Incremement AR1 and AR2 by 1 with or without circular ; addressing depending on circular addressing bit ; for the respective auxiliary registers

Questions & Answers

what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
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
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
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.
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Digital signal processing laboratory (ece 420 55x). OpenStax CNX. Jan 18, 2010 Download for free at http://cnx.org/content/col10397/1.10
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Digital signal processing laboratory (ece 420 55x)' conversation and receive update notifications?