<< Chapter < Page Chapter >> Page >

SP is initialized for you in the core file and should not need to be modified. SP -referenced direct addressing is used by the pshd , pshm , popd , and popm instructions for stack manipulation, as well as by all subroutine calls and returns, which save program addresses onthe stack.

DP -referenced direct addressing is available wherever you see the Smem abbreviation in an assembly syntax description. The advantage of DP -referenced addressing over the *(lk) form described in the next section is that DP -referenced addressing will not add an extra instruction word (and corresponding extra machine cycle). Thedisadvantage is that it is limited to 128 words of contiguous memory, and you have to make sure that DP points to the right 128 words. DP may be changed with the ld instruction as needed.


ld 10,A ; sets A = (contents of memory location DP + 10) add 6,B ; sets B = B + (contents of memory location DP + 6)

Make sure you understand that the numbers 10 and 6 above are interpreted as memory addresses, not data values. To get data values, you would need to use a pound sign in front of the numbers.

Absolute addressing: dmad, pmad, *(lk)/smem

This seems to be TI's term for all the forms of direct addressing which it does not call direct addressing! It isrepresented in assembly-instruction syntax-definitions using one of the above abbreviations ( *(lk) addressing is available when the syntax definition says Smem ).


dmad (Data Memory ADdress) operands are used by mv xx data move instructions and represent 16-bit memory addresses in datamemory whose contents are used in the instruction.


f3ptr .word 0 ; reserve one word of storage; initialize to 0 . . . . mvdm f3ptr,AR4 ; set AR4 = memory address of f3ptr


pmad (Program Memory ADdress) operands are used by the firs , macd , macp , mvdp , and mvpd instructions, as well as all subroutine calls and branching instructions. They represent 16-bit addresses in programmemory whose contents are used in the instruction, or jumped to in the case of branch instructions. Other thansubroutine calls and branches, the most common use of a pmad is for the firs instruction.


firs *AR3+,*AR4+,coefs

coefs is a label in the program section of the code, not the data section.


*(lk) addressing is a syntactic oddity. The asterisk symbol generally means that indirect addressing isbeing used (see below), but this is actually direct addressing with a 16-bit data memory address encoded in theinstruction's last word. The reason for the asterisk is that TI does set the "I" bit in the opcode, usually denoting indirect addressing, and this formcan only be used when an Smem is called for in the assembly syntax. Other bits in the low byte of thefirst instruction word tell the processor that the " *(lk) exception" is to be used, and to fetch the memory address in the next word (see the MOD bits onpage 5-10 of the CPU and Peripherals reference). You can easily recognize this addressing mode in .lst files because the low byte of the first instruction word always equals F8h .

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
I know this work
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
I rally confuse this number And equations too I need exactly help
But this is not salma it's Faiza live in lousvile Ky I garbage this so I am going collage with JCTC that the of the collage thank you my friends
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris 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
what is nano technology
Sravani Reply
what is system testing?
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
what is system testing
what is the application of nanotechnology?
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
anybody can imagine what will be happen after 100 years from now in nano tech world
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
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
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
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

Source:  OpenStax, Dsp laboratory with ti tms320c54x. OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10078/1.2
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Dsp laboratory with ti tms320c54x' conversation and receive update notifications?