Q. Which bit of the IE register is used to enable TxD/RxD interrupt?

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Q. Which of the following combination is the best to enable the external hardware interrupt 0 of the IE register (assuming initially all bits of the IE register are zero)?

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Q. Why normally LJMP instructions are the topmost lines of the ISR?

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Q. Which register is used to make the pulse a level or a edge triggered pulse?

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Q. What is the disadvantage of a level triggered pulse?

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Q. What is the correct order of priority that is set after a controller gets reset?

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Q. How many rows and columns are present in a 16*2 alphanumeric LCD?

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Q. How many data lines are there in a 16*2 alphanumeric LCD?

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Q. Which pin of the LCD is used for adjusting its contrast?

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Q. For writing commands on an LCD, RS bit is

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Q. Which command of an LCD is used to shift the entire display to the right?

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Q. Which command is used to select the 2 lines and 5*7 matrix of an LCD?

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Q. What changes are to be made to send data to an LCD?

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Q. For reading operation from an LCD what changes in the software are introduced?

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Q. Which instruction is used to select the first row first column of an LCD?

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Q. The RS pin is an input or output for a controller?

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Q. Which of the following steps detects the key in a 4*4 keyboard matrix about the key that is being pressed?

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Q. What is described by this command: CJNE A,#00001111b, ROW1

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Q. To detect that in which column, the key is placed?

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Q. In reading the columns of a matrix, if no key is pressed we should get all in binary notation

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