Q. In AVR, the LCD operates in two main modes, it can be in 8 bit or 4 bit data.

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Q. What can be the sequence of commands that may be used for initializing an LCD?

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Q. When the LCD operates in the 4 bit mode, then what more commands are added to it?

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Q. What is the main function of the LPM instruction used in LCD?

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Q. The RS pin acts as an

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Q. To latch in information at the data pins of the LCD, we send

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Q. What is the function of the 0x06 command?

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Q. What is the address of the second column and the second row of the 2*20 LCD?

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Q. Which of the following commands takes more than 100 microseconds to run?

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Q. For selecting the data pins in a LCD, RS pin should be

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Q. In reading the columns of a keyboard matrix, when no key is pressed then all the pins show

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Q. To see if any key is pressed, all rows are grounded.

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Q. Identify the row and the column for the following case when for the row D3-D0= 1110 and for the column D3-D0= 1101

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Q. What are the actual steps that are followed in identifying any key that is being pressed?

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Q. To identify that the key is present in which row and the column

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Q. The key detection and the key identification are two different procedures?

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Q. What is described by the following command?
KCODE0<<1

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Q. If the pins of the keyboard are used as an interrupt, then these pins will cause interrupt of what type?

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Q. What will happen if two keys of the keyboard are pressed at a time?

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Q. Why initially all keys are considered open before detecting the key pressed?

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