ECET 340 Week 1 HomeWork 1

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DEVRY ECET 340 Week 1 HomeWork 1

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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)
• 2. Given the requirements of each signals
  destination must match the capabilities of the
  signals 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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• 3. Write down the instructions needed to program
  PORT A for pins PA7, PA4-PA0 as inputs and
  PA6-PA5 as outputs. Answer should be a valid C
  language statement. (2 points)
• 4. Write an instruction sequence to output the
  value 35 to PORT P. Use the C language only when
  writing your answer - no assembly language. (2
  points)
• 5. Write an instruction sequence to configure
  Port H for input, read in the current signal
  levels on the Port H pins, and store the value to
  a C variable called data1. Use the C language
  only when writing your answer, no assembly
  language. Also make sure to set the data
  direction register appropriately in your answer.
  (2 points)
• 6. Write a short program in C language which
  reads in the bits on port H, inverts the bits and
  adds 1 to the result, and then outputs the result
  onto port P. Be sure to include port
  initializations and variable declarations in your
  code. (2 points)
• 7. Using only Ports B, H, J, (see Figure 1
  write C code to read in the value from dip switch
  1 (SW1) all 8 bits, invert the bits, and then
  display the results on the 8 LEDs driven by Port
  B (see Figure 3). When the value is a 1, the
  LED is ON, and when it is a 0, the LED is off.
  See how SW1 is connected to Port H (see Figure
  2), and how the LEDs are connected to Port J (see
  Figure 3) (2 points)

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• 8. What maximum current will be drawn from the 5V
  output of a peripheral device connected to an
  HCS12 input port? What input resistance does this
  represent? Please note the problem states
  connected to an HCS12 input port. (3 points)
• 9. Given an LED with a forward drop of 1.5V and
  an operating current of 10 mA, design the
  interface to the HCS12 showing your calculations.
  (3 points)