Que: 101. To latch in information at the data pins of the LCD, we send
|
| a. H-L pulse at the E pin |
| b. L-H pulse at the E pin |
| c. A constant H pulse at the E pin |
| d. A constant L pulse at the E pin |
(a). H-L pulse at the E pin
Que: 102. What is the function of the 0x06 command?
|
| a. to clear the LCD |
| b. to blink the cursor |
| c. to shift the cursor to the right |
| d. for selecting the matrix |
(c). to shift the cursor to the right
Que: 103. What is the address of the second column and the second row of the 2*20 LCD?
|
| a. 0x80 |
| b. 0x81 |
| c. 0xc0 |
| d. 0xc1 |
Que: 104. Which of the following commands takes more than 100 microseconds to run?
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| a. shift cursor left |
| b. shift cursor right |
| c. set address location of the DDRAM |
| d. clear screen |
Que: 105. For selecting the data pins in a LCD, RS pin should be
|
| a. 1 |
| b. 0 |
| c. F |
| d. 10 |
Que: 106. In reading the columns of a keyboard matrix, when no key is pressed then all the pins show
|
| a. 0 |
| b. 1 |
| c. F |
| d. 7 |
Que: 107. To see if any key is pressed, all rows are grounded.
|
| a. TRUE |
| b. FALSE |
| c. can’t be said |
| d. depends on the conditions |
Que: 108. Identify the row and the column for the following case when for the row D3-D0= 1110 and for the column D3-D0= 1101
|
| a. first row and second column |
| b. first row and third column |
| c. second row and first column |
| d. second row and second column |
(a). first row and second column
Que: 109. What are the actual steps that are followed in identifying any key that is being pressed?
|
| a. wait for the debounce time |
| b. identify the key that is pressed |
| c. initially no key should be pressed |
| d. all of the mentioned |
(d). all of the mentioned
Que: 110. To identify that the key is present in which row and the column
|
| a. we ground the bits of the row one by one |
| b. we ground the bits of the column one by one |
| c. we connect the bits of the row to the logic level 1 one by one |
| d. we can connect the columns to the logic level 1 one by one |
(a). we ground the bits of the row one by one