Q. On reset, what are the contents of the SREG register?

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Q. TIMSK register is used for?

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Q. Why RETI instruction is used after an ISR?

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Q. In AVR what is the ISR address for an external hardware interrupt?

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Q. What is the address in the interrupt service routine assigned for the timer0 overflow flag?

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Q. Is the same address is assigned for the timer0 and timer1 overflow flag in the interrupt vector table of the interrupts?

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Q. External hardware interrupts are assigned to which pins of the atmega32?

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Q. Which register is responsible for handling all the external hardware interrupts?

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Q. By default, INT0-INT2 interrupts are?

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Q. What will happen in that condition, if an interrupt occurs while the micro controller is serving any other interrupt?

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Q. What actually are the DB9, DB25 ports available in our computers?

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Q. What does RI handshaking signal refer to according to the RS232 logic?

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Q. What is the major difference between a MAX232 and a MAX233 device?

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Q. Which of the following is correct about the baud rate during serial transmission?

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Q. With fosc= 8 MHz, what will the count that has to filled in the UBRR register to account for the 9600 baud rate?

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Q. The USART in AVR based micro controllers operate at which of the following modes?

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Q. Which bit of the UCSRA is used for doubling the baud rate of the transmission?

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Q. What is the use of the PE and the FE bits of the UCSRA register?

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Q. Which of the following bits are used for setting the data frame size?

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Q. Which of the following parameters should the transmitter and the receiver agree upon before starting a serial transmission?

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