01․ Both the ALU and control section of CPU employ which special purpose storage location?
Accumulator is a special purpose 8-bit register which is used as a storage for almost all arithmetic and logic operations.
02․ IN an intel 8085A microprocessor, why is READY signal used?
Ready signal is used in microprocessor to communicate with slow peripheral device. It provides proper synchronization between processor and slow devices.
03․ Assertion(A): Monostablemultivibrators (IC74121) are used in a microprocessor based system for frequency measurement. Reason(R): Microprocessor counts the number of interrupt signals/second or within a specified interval through ISR.
IC74121 is used for frequency measurement in microprocessor and microprocessor counts the number of interrupt signals/second or within a specified interval through ISR.
04․ Consider the following I) Sign flag II) Trap flag III) Parity flag IV) Auxiliary carry flag. Which one of the above flags is/are present in 8085 microprocessor?
Trap flag is not present in 8085 microprocessor.
05․ Consider the following statements: In 8085 microprocessor, data-bus and address bus are multiplexed in order to I)Increase the speed of microprocessor. II)Reduce the number of pins. III)Connect more peripheral chips. Which of these statements is/are correct?
Lower byte of address bus (A0 - A7) are multiplexed with data bus (AD0 - AD7) to reduce the number of pins of microprocessor. This multiplexed address is controlled by ALE signal.
06․ Assertion(A): Address bus is unidirectional. Reason(R): Data bus is bidirectional
Address bus is unidirectional and data bus is bidirectional.
07․ Assertion(A): The frequency of 8085 system is ½ of the crystal frequency. Reason(R): Microprocessor (8085) requires a two phase clock.
Microprocessor clock frequency = (Crystal frequency/2)
08․ ALU (Arithmetic and Logic Unit ) of 8085 microprocessor consists of
ALU consists of Accumulator, temporary register, arithmetic, logic circuits and five flags.
09․ Which components are NOT found on chip in a microprocessor but may be found on chip in a microcontroller?
EPROM, USART & PORTS are found on chip in microcontroller but not in microprocessor chip.
10․ The clock speed of 8085 is
8085 requires a signal +5V power supply and operates at 3.2 MHZ single phase clock.