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.

 

   
  


 

 

 

  

 

 

 

 

    • Posted: 5 years ago
    Week 1 - Quiz

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