Transcript ECET 340 Week 2 iLab 2

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ECET 340 Week 1
ECET 340 Week 1
ECET 340 Week 2
ECET 340 Week 2
ECET 340 Week 3
ECET 340 Week 3
ECET 340 Week 4
ECET 340 Week 4
ECET 340 Week 5
ECET 340 Week 5
ECET 340 Week 6
ECET 340 Week 6
HomeWork 1
iLab 1
HomeWork 2
iLab 2
HomeWork 3
iLab 3
HomeWork 4
iLab 4
HomeWork 5
iLab 5
HomeWork 6
iLab 6
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1. Give three examples each of internal and external
peripheral devices as referenced to the HCS12
microcontroller and not an entire PC. (2 points)
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2. Given “the requirements of each signal’s destination
must match the capabilities of the signal’s source,” name
some of the electrical signal parameters that must be
considered when designing an interface between two
different hardware components. (2 points)
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OBJECTIVES:
To become familiar with Microcontroller MC9S12 parallel
ports and how simple input and output devices are
interfaced through them.
To learn how to program I/O instructions in C language.
To learn how to organize a program to read data from
input ports, process the data, and display the result on a
simple output device.
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1. Where does program control transfer to when an
interrupt occurs? +2 points
2. Which one of the following Interrupts has highest
priority? +2 points
3. RAM Vector table addresses $3E52 belongs to which
interrupt? +2 points
4. Before exiting an ISR, the programmer should use which
command? +2 points
5. In which one of the following sequences is the stack
pulled by rti? +3 points
6. Given the starting address for the TC0 Interrupt is to
become $5000. Write the assembly instruction necessary to
place this ISR address into the interrupt vector table and
then unmask the interrupt (assembly only). +3 points
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ECET 340 Week 2 iLab 2
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1. Sketch a circuit that can be used to debounce a
pushbutton and explain how it works. (4 points max)
2. In Figure 7.32 on page 339 of the Huang textbook, if the
row has and the columnsare , which key is pressed? (2
points max)
3. In Figure 7.32 on page 339 of the Huang textbook,
explain why the 10kΩ resistors ties to VCC are required. (2
points max)
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SOLVED ECET 340 iLAB3
OBJECTIVES:
To learn the basic operation of a keypad.
To understand how to interface a keypad to a
microprocessor.
To learn how to program a keypad driver in C language.
To learn how to program a keypad activated interrupt that
identifies the key being pressed and displays or otherwise
returns its value to the main program.
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1. Determine the conversion time for an ADC0804 (8-bit),
where 66 clocks per bit are required, if its clock frequency
is 50 kHz.
2. If an 8-bit SAR has Vref = 10 V, what is the binary value
for an input voltage of 7.28 V?
3. What is the percent error for the binary answer found
in Problem #2?
4. Given an 24 MHz bus speed. Write down the line(s) of
instruction which set the ATD1 unit for 2MHz conversion
frequency, 10-bit resolution and 8 A-to-D clocks per sample
time.
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I. OBJECTIVES:
To learn how to use A-to-D converters to digitize signals
from analog input devices.
To learn how to write a C language program that samples
the data from an analog device, digitizes it and formats it
for output on an LCD.
To become more proficient in programming displays for
real-time operation.
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1. Explain, briefly, why an analog restoring filter is
sometimes used at the output of a DAC.
2. Give Iref = 2 mA for a DAC1408 IC, find Iout for the
input 1110 1110
3. Find the number of discrete voltages output by a 12-bit
DAC. Show work.
4. Use the internet to locate the data sheet for an MC1408
DAC. From it find, for the MC1408-7 version, the following:
a. The settling time
b. Accuracy at full scale output current (1.99 mA), 25ºC
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Scenario/Summary
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This week's lab covers two areas, conversion of digital HCS12
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signals to an analog format, and the use of a Serial Peripheral
Interface (SPI)
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to transfer data, and commands between the HCS12, and the
DAC
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peripheral.
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Deliverables
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For this lab, the deliverables include the cover sheet,
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filled-in sections of the lab report, photographs (online), or
instructor
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sign-offs (onsite), and answers to the questions. The cover
sheet must be
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completed in typed format.
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1. What are the four main functions of the HC12 Timer
unit?
2. Two input capture events occur at counts 0x1037 and
0xFF20 of the free-running counter. How many counts (in
decimal) have transpired between these two events?
3. What is the maximum time possible before the freerunning counter overflows when the e MHz?
4. Two input capture events occur at 0x1037 and 0x002A.
If the prescaler bits PR[2:1:0] are set to 101 and the e
clock is 24 MHz, how much time as transpired between the
two events?
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ECET 340 Week 6 iLab 6 (Devry)
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1. The movable part of the solenoid is the: +2 points
2. Why is the 6N139 optoisolator used in the interfaces to
devices such as large motors? +2 points
3. Calculate the number of steps per revolution for a
stepper motor with a step angle of 7.5°. +2 points
4. How is stepper motor speed controlled? State any two
ways a program can do this. +2 points
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ECET 340 Week 7 iLab 7
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