3. ECET 340 HELP Learn by Doing
ECET 340 Week 1 HomeWork 1 (Devry)
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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)
4. ECET 340 HELP Learn by Doing
ECET 340 Week 1 iLab 1 (Devry)
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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.
5. ECET 340 HELP Learn by Doing
ECET 340 Week 2 HomeWork 2 (Devry)
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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
6. ECET 340 HELP Learn by Doing
ECET 340 Week 2 iLab 2 (Devry)
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ECET 340 Week 2 iLab 2
7. ECET 340 HELP Learn by Doing
ECET 340 Week 3 HomeWork 3 (Devry)
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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)
8. ECET 340 HELP Learn by Doing
ECET 340 Week 3 iLab 3 (Devry)
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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.
9. ECET 340 HELP Learn by Doing
ECET 340 Week 4 HomeWork 4 (Devry)
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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?
10. ECET 340 HELP Learn by Doing
ECET 340 Week 4 iLab 4 (Devry)
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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.
11. ECET 340 HELP Learn by Doing
ECET 340 Week 5 HomeWork 5 (Devry)
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1. Explain, briefly, why an analog restoring filter is
sometimes used at the output of a DAC.
2. Given 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.
12. ECET 340 HELP Learn by Doing
ECET 340 Week 5 iLab 5 (Devry)
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Scenario/Summary
This week's lab covers two areas, conversion of digital
HCS12
signals to an analog format, and the use of a Serial
Peripheral Interface (SPI)
to transfer data, and commands between the HCS12, and
the DAC
Peripheral.
13. ECET 340 HELP Learn by Doing
ECET 340 Week 6 HomeWork 6 (Devry)
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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?
14. ECET 340 HELP Learn by Doing
ECET 340 Week 6 iLab 6 (Devry)
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ECET 340 Week 6 iLab 6
15. ECET 340 HELP Learn by Doing
ECET 340 Week 7 HomeWork 7 (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
16. ECET 340 HELP Learn by Doing
ECET 340 Week 7 iLab 7 (Devry)
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ECET 340 Week 7 iLab 7
