ECET 340 – Week 1 Quiz

 1. Question : (TCO 1) In a typical keypad switch, bouncing occurs for how long?
  Student Answer: [removed]5 to 20 ns
  [removed]5 to 20 μs
  CORRECT [removed]5 to 20 ms
  [removed]5 to 20 s
 

 

Question 2. Question : (TCO 1) The following data will display the letter ‘A’ on the LCD.
  Student Answer: CORRECT [removed]data = 0x41, CSB = 0, E = ↓, RS = 1, R/W~ = 0
  [removed]data = 0x61, CSB = 0, E = ↓, RS = 1, R/W~ =

Question 2. Question : (TCO 1) The following data will display the letter ‘A’ on the LCD.

0

  [removed]data = 0x41, CSB = 0, E = ↓, RS = 0, R/W~ = 0
  [removed]data = 0x61, CSB = 0, E = ↑, RS = 1, R/W~ = 0
 
 

 

Question 3. Question : (TCO 1) For the LCD, describe the function accomplished with the RS control signal. Also, indicate whether this signal is an LCD input or LCD output.
 

 

Question 4. Question : (TCO 1) Describe how the 74C922 IC operates and its interface between the keypad and the microcontroller.
 
 
 

 

Question 5. Question : (TCO 1) In the LCD initialization sequence, which command configures the LCD to a 4-bit data transfer instead of an 8-bit data transfer? Also, identify the point in the initialization sequence that this occurs.
 
 

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