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Central processing unit (msp430x cpu)

Main features of the msp430x cpu architecture

The MSP430X CPU extends the addressing capabilities of the MSP430 family beyond 64 kB to 1 MB. To achieve this, there are some changes to the addressing modes and two new types of instructions. One type of new instructions allows access to the entire address space, and the other is designed for address calculations.

The MSP430X CPU address bus is 20 bits, but the data bus is still 16 bits. The CPU supports 8-bit, 16-bit and 20-bit memory accesses. Despite these changes, the MSP430X CPU remains compatible with the MSP430 CPU, having a similar number of registers. A block diagram of the MSP430X CPU is shown in the figure below:

Msp430x cpu block diagram.

Although the MSP430X CPU structure is similar to that of the MSP430 CPU, there are some differences that will now be discussed.

With the exception of the status register SR, all MSP430X registers are 20 bits. The CPU can now process 20-bit or 16-bit data.

Msp430x cpu registers

R0 (pc) - program counter

Has the same function as the MSP430 CPU, although now it has 20 bits.

R1 (sp) - stack pointer

Has the same function as the MSP430 CPU, although now it has 20 bits.

R2 (sr) - status register

Has the same function as the MSP430 CPU, but still only has 16 bits.

Description of the sr bits.

R2 (cg1) and r3 (cg2) - constant generators

The registers R2 and R3 can be used to generate six different constants commonly used in programming, without the need to add an extra 16-bit word of code to the instruction. The constants below are chosen based on the bit (As) of the instruction that selects the addressing mode.

Values of constant generators.

Whenever the operand is one of these six constants, the registers are selected automatically. Therefore, when used in constant mode, registers R2 and R3 cannot be addressed explicitly by acting as source registers.

R4-r15 – general-purpose registers

These registers have the same function as the MSP430 CPU, although they now have 20 bits. They can store 8-bit, 16-bit or 20-bit data. Any byte written to one of these registers clears bits 19:8. Any word written to one of these registers clears bits 19:16. The exception to this rule is the instruction SXT, which extends the sign value to fill the 20-bit register.

The following figures illustrate how the operations are conducted for the exchange of information between memory and registers, for the following formats: byte (8 bits), word (16 bits) and address (20 bits).

The following figure illustrates the handling of a byte (8 bits) using the suffix .B.

Example: register-byte/byte-register operation.

The following figure illustrates the handling of a word (16-bit) using the suffix .W.

Example: register-word/word-register operation.

Example: register-word/word-register operation.

The following figure illustrates the manipulation of an address (20 bits) using the suffix .A.

Example: register - address-word operation.

Example: address-word - register operation.

Request the MSP430 Teaching ROM Materials here (External Link)

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
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
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
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
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Teaching and classroom laboratories based on the “ez430” and "experimenter's board" msp430 microcontroller platforms and code composer essentials. OpenStax CNX. May 19, 2009 Download for free at http://cnx.org/content/col10706/1.3
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