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- Interrupts.

Software application organization

The software structure allows various tasks to be performed simultaneously. The routine main() is responsible for configuring all the resources used by the application. Once started, the application enables all the interrupts and waits for an interrupt request.

There are two routines that separately service the two possible interrupts. The routine TimerA1_ISR() services interrupts required by the Timer_A overflow and by the TACCR1 capture unit. For every interrupt caused by a TACCR1 capture, the value collected in the TACCR1 register is stored in T1 , if it is the first low-to-high transition, or stored in T2 if it is the second low-to-high transition. This sequence is controlled by the variable capture. The variable flag is used to flag the measurement process. This process occurs between the capture of the first low-to-high transition and the second transition. The counting of clock pulses is done by Timer_A, in the time interval between the T1 and T2 acquisition, assigned to the variable T . The process is synchronized when Timer_A overflows, restarting the measurement process. The LCD is refreshed once every 0.5 seconds with the latest measured frequency value, using the control variable control tick that corresponds to 0.5 seconds.

The routine basic_timer_ISR() services the interrupt produced by Basic Timer1 once every second. This routine begins by switching the state of LED1 and LED2. In addition, it updates the Timer_B counting period. The variable read_data allows the counting period to be changed.

System configuration

Basic timer1

Basic Timer1 generates an interrupt once every second. Use the two counters in series, where the BTCNT2 counter input is selected as the BTCNT1 counter output divided by 256. The BTCNT1 counter input is the ACLK clock signal with a frequency of 32.768 kHz.

If BTCNT2 counter selected output is divided by 128, what is the time period associated with the Basic Timer1 interrupt? _________

The values written to the configuration registers are:

BTCTL = BTDIV | BT_fCLK2_DIV128; // (ACLK/256)/128 IE2 |= BTIE; // Enable BT interrupt with 1 sec period

Timer_b

The TBCCR4 compare unit is used to generate the PWM signal. The set/reset compare mode is used.

The values written to the configuration registers are:

TBCTL = TBSSEL_2 | CNTL_0 | TBCLGRP_0 |MC_1 | ID_0; // SMCLK, continuous modeTBCCTL4 = OUTMOD_3; // CCR4 output mode 3 (set/reset)

The TB4 PWM output signal has a frequency X, with a 50% duty-cycle. The SMCLK clock signal is used as input of Timer_B.

The values written to the configuration registers are:

TBCCR0 = 39977;// Output 200 Hz signal with 50% duty cycle TBCCR4 = TBCCR0/2;

What the largest and lowest generated frequency?

Maximum frequency value: ____________

Minimum frequency value: _____________

Timer_a

Timer_A is sourced by the SMCLK clock signal. It counts to the value 0xFFFF, in continuous mode. An interrupt is generated when the TAR counter overflows. What is the value to write to its configuration register?

Questions & Answers

Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
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
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
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
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
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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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