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

[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:

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

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

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.