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MCQs

Total Questions : 275 | Page 23 of 28 pages
Question 221. The reason for the presence of ALE pin in 8085, but not in 6800 is that
  1.     None
  2.     8085 has 5 interrupts lines, whereas 6800 has only two
  3.     8085 has multiplexed bus, whereas 6800 does not have
  4.     8085 uses I/O mapped I/O, whereas 6800 uses memory mapped I/O
 Discuss Question
Answer: Option C. ->  8085 has multiplexed bus, whereas 6800 does not have
Question 222. Which of the following is not true during the execution of an interrupt service routine, which does not contain any EI instructions
  1.     all interrupts except non-maskable interrupt are disabled
  2.     the microprocessor can be interrupted by a non-mask able interrupt
  3.     the microprocessor cannot be interrupted by any mask able interrupt
  4.     the microprocessor cannot be interrupted by any interrupt
 Discuss Question
Answer: Option D. ->  the microprocessor cannot be interrupted by any interrupt
Question 223. Cycle stealing mode of DMA operation involves
  1.     Data transfer takes place between the I/O device and memory during every alternate clock cycle
  2.     While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
  3.     The DMA control waiting for the microprocessor to finish execution of the program and then takes over the buses
  4.     DMA controller taking over the address, data and control buses while a block of data is transferred between memory and I/O device
 Discuss Question
Answer: Option B. ->  While the microprocessor is executing a program an interface circuit takes over control of address, data, control buses when not in use by microprocessor
Question 224. In 8085 microprocessor based system maximum possible number of input/output devices can be connected using I/O mapped I/O technique is
  1.     64
  2.     256
  3.     512
  4.     65536
 Discuss Question
Answer: Option C. ->  512
Question 225. The addressing mode in instruction PUSH B is
  1.     register indirect
  2.     direct
  3.     register
  4.     immediate
 Discuss Question
Answer: Option A. ->  register indirect
Question 226. Maximum number of I/O that can be addressed by the INTEL 8085 is
  1.     256
  2.     285
  3.     65536
  4.     512
 Discuss Question
Answer: Option A. ->  256
Question 227. The microprocessor may be made to exit from HALT state by asserting
  1.     A or B or HOLD line
  2.     any of the five interrupt lines
  3.     RESTART
  4.     READY line
 Discuss Question
Answer: Option A. ->  A or B or HOLD line
Question 228. The 8085 microprocessor enters into bus idle machine cycle whenever
  1.     DAD RP instruction is executed
  2.     INTR interrupt is recognized
  3.     RST 7.5 is recognized
  4.    None of these
 Discuss Question
Answer: Option C. ->  RST 7.5 is recognized
Question 229. In order to complement the lower nibble of accumulator one can use
  1.     CMA
  2.     ORI 0FH
  3.     XRI 0FH
  4.     ANI 0FH
 Discuss Question
Answer: Option C. ->  XRI 0FH
Question 230. After RESET 8255 will be in
  1.     mode 0; all ports are output
  2.     unchanged condition
  3.     mode 2
  4.     mode 0; all ports are input
 Discuss Question
Answer: Option D. ->  mode 0; all ports are input

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