Microprocessors and Interfacing Mid - I, September - 2014

1.8085 microprocessor contain ………….……. number of 16 bit registers.
  • 2
  • 3
  • 4
  • 5
Answer: D
2.After execution of CMP instruction, if Source is greater than destination then CF = …… & ZF = ……
  • 1, 0
  • 1, 1
  • 0, 0
  • 0, 1
Answer: A
3.What does microprocessor speed depends on?
  • clock
  • Data Bus width
  • Address Bus width
  • a & b
Answer: B
4.In 8255, under the I/O mode of operation, we have …… modes
  • 3
  • 2
  • 4
  • 1
Answer: B
5.In a DMA write operation the data is transferred
  • From I/O to memory
  • from memory to I/O
  • from memory to memory
  • from I/O to I/O
Answer: A
6.Ready pin of a microprocessor is used
  • to indicate that the microprocessor is ready to receive inputs
  • to indicate that the microprocessor is ready to receive outputs
  • to introduce wait states
  • to provide direct memory access
Answer: C
7.Which port of 8255 used for control signals in IO mode2 configuration
  • mode 0
  • mode 1
  • mode 2
  • b & c
Answer: D
8.In 8086, the status of & A0 while transferring 16 bit data.
  • 0, 0
  • 0, 1
  • 1, 0
  • 1, 1
Answer: A
9.Which instruction performs 2’s complement
  • CMPL
  • NEG
  • CLR
  • XTAL
Answer: B
10.In 8086 the following has the highest priority among all the interrupts
  • NMI
  • DIV O
  • TYPE 255
  • OVER FLOW
Answer: A
11.Number of Interrupt Sources in 8085 is ……………..
Answer: 5
12.………… 8086 microprocessor pins are used to request and acknowledge a DMA transfer?
Answer: HOLD & HLDA
13.Maximum ………………. amount of memory can be interface to 8086 microprocessor.
Answer: 1MB
14.Settling time of DAC 0800 around …………..
Answer: 100ms
15.………….. Interrupt of 8086 is level triggered signal.
Answer: INTR
16.……………. instruction converts hexadecimal number into decimal.
Answer: DAA
17.Base address is …………………….
Answer: Starting address of the segment
18.MOV AX, 10H [BX+SI] is in ……………….. Addressing mode.
Answer: Relative base indexed addressing mode
19.………………… are used to separate valid address and data in minimum mode configuration of 8086.
Answer: Latches& transceivers
20.Hints to assembler are called ………………
Answer: Assembler directives