This set of 8051 Micro-controller Multiple Choice Questions & Answers (MCQs) focuses on “LCD Interfacing”.
1. How many rows and columns are present in a 16*2 alphanumeric LCD?
a) rows=2, columns=32
b) rows=16, columns=2
c) rows=16, columns=16
d) rows=2, columns=16
View Answer
Explanation: 16*2 alphanumeric LCD has 2 rows and 16 columns.
2. How many data lines are there in a 16*2 alphanumeric LCD?
a) 16
b) 8
c) 1
d) 0
View Answer
Explanation: There are eight data lines from pin no 7 to pin no 14 in an LCD.
3. Which pin of the LCD is used for adjusting its contrast?
a) pin no 1
b) pin no 2
c) pin no 3
d) pin no 4
View Answer
Explanation: Pin no 3 is used for controlling the contrast of the LCD.
4. For writing commands on an LCD, RS bit is
a) set
b) reset
c) set & reset
d) none of the mentioned
View Answer
Explanation: For writing commands on an LCD, RS pin is reset.
5. Which command of an LCD is used to shift the entire display to the right?
a) 0x1C
b) 0x18
c) 0x05
d) 0x07
View Answer
Explanation: 0x1C is used to shift the entire display to the right.
6. Which command is used to select the 2 lines and 5*7 matrix of an LCD?
a) 0x01
b) 0x06
c) 0x0e
d) 0x38
View Answer
Explanation: 0x38 is used to select the 2 lines and 5*7 matrix of an LCD.
7. What changes are to be made to send data to an LCD?
a) set the R/W bit
b) set the E bit
c) set the RS bit
d) all of the mentioned
View Answer
Explanation: To send data to an LCD, RS pin of the LCD should be set.
8. For reading operation from an LCD what changes in the software are introduced?
a) low to high pulse at E pin
b) R/W pin is set high
c) low to high pulse at E pin & R/W pin is set high
d) none of the mentioned
View Answer
Explanation: For reading operations, R/W pin should be made high and added to it, a low to high pulse is also generated at the E pin.
9. Which instruction is used to select the first row first column of an LCD?
a) 0x08
b) 0x0c
c) 0x80
d) 0xc0
View Answer
Explanation: 0x80 is used to select the first row first column of an LCD.
10. The RS pin is an input/output for a controller?
a) input
b) output
c) input & output
d) none of the mentioned
View Answer
Explanation: For a controller, it is an output pin, but for an LCD it is an input pin.
Sanfoundry Global Education & Learning Series – Microcontroller.
To practice all areas of Microcontroller, here is complete set of 1000+ Multiple Choice Questions and Answers.
