Q. What is the difference between UART and USART communication?

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Q. Which of the following best describes the use of framing in asynchronous means of communication?

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Q. Which of the following signal control the flow of data?

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Q. Which of the following is the logic level understood by the micro-controller/micro-processor?

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Q. What is null modem connection?

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Q. Which of the following best states the reason that why baud rate is mentioned in serial communication?

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Q. With what frequency UART operates( where f denoted the crystal frequency )?

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Q. What is the function of SCON register?

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Q. What should be done if we want to double the baud rate?

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Q. When any interrupt is enabled, then where does the pointer moves immediately after this interrupt has occurred?

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Q. What are the contents of the IE register, when the interrupt of the memory location 0x00 is caused?

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Q. After RETI instruction is executed then the pointer will move to which location in the program?

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Q. Which pin of the external hardware is said to exhibit INT0 interrupt?

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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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