Docsity
Docsity
Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity

Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan

Guidelines and tips
Guidelines and tips
Sell on Docsity
Sell on Docsity
Docsity AI
Docsity AI
Log inSign up

Prepare for your exams

Study with the several resources on Docsity

Find documents

Prepare for your exams with the study notes shared by other students like you on Docsity

Search for your university

Find the specific documents for your university's exams

Docsity AINEW

Summarize your documents, ask them questions, convert them into quizzes and concept maps

Explore questions

Clear up your doubts by reading the answers to questions asked by your fellow students

Earn points to download

Earn points by helping other students or get them with a premium plan

Share documents
download point icon20 Points

For each uploaded document

Answer questions
download point icon5 Points

For each given answer (max 1 per day)

All the ways to get free points
Get points immediately

Choose a premium plan with all the points you need

Study Opportunities

Choose your next study program

Get in touch with the best universities in the world. Search through thousands of universities and official partners

Community

Ask the community

Ask the community for help and clear up your study doubts

Free resources

Our save-the-student-ebooks!

Download our free guides on studying techniques, anxiety management strategies, and thesis advice from Docsity tutors

Embedded Systems Exam 2 - Spring 2008 - Problem Solutions, Exams of Microprocessors

University of Texas - El PasoMicroprocessors

Solutions to problems 1, 2, and 3 from the embedded systems exam 2 held in spring 2008 by macdonald. Problem 1 involves writing a subroutine to initiate an 8-bit single conversion sequence on channel 7 and transfer the result to a memory location. Problem 2 deals with writing an interrupt service routine (isr) for the result transfer. Problem 3 requires writing a subroutine to initialize the pwm peripheral with two active channels and disabled others.

Typology: Exams

Pre 2010

Uploaded on 08/19/2009

koofers-user-3fp
koofers-user-3fp 🇺🇸

10 documents

1 / 3

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
EE3376 – Embedded Systems - Spring 2008 - Exam 2 – MacDonald – Page 1
Student Name:______________________________ Student ID: _______________
Problem 1
Write a subroutine that will initiate an 8-bit single conversion sequence on channel
7, wait for the results to become valid (through polling) and then transfer the
result(s) into the location(s) at $2000.
Assume that the ATD is already powered-up (no need to enable core), that
interrupts are disabled, that timing related input to the core is correct and that the
precision is set correctly as well (i.e. 8 or 10 bits).
Hint: Can be done in 4 instructions including RTS.
pf3

Partial preview of the text

Download Embedded Systems Exam 2 - Spring 2008 - Problem Solutions and more Exams Microprocessors in PDF only on Docsity!

Student Name:______________________________ Student ID: _______________ Problem 1 Write a subroutine that will initiate an 8-bit single conversion sequence on channel 7, wait for the results to become valid (through polling) and then transfer theresult(s) into the location(s) at $2000.

Assume that the ATD is already powered-up (no need to enable core), that interrupts are disabled, that timing related input to the core is correct and that the precision is set correctly as well (i.e. 8 or 10 bits). Hint: Can be done in 4 instructions including RTS.

Student Name:_______________________________ Student ID: _______________ Problem 2

MAIN CODE ISR

rti_isr: ldaa $ coma inca

staa $3000 RTI IRQ occurs here staa $

rti

Table 1 Location Prior toCOMA in main codeAfter STAA Just Prior toRTI Just afterRTI reg A $ reg B $ reg D reg X $ reg Y $ Mem $2000 $ Mem $2001 $ Mem $3000 $ Mem $3001 $