Classical

Computer Organization Architecture - Machine instructions and addressing modes

1:   A low memory can be connected to microprocessor by using
A. INTER
B. RESET IN
C. Both (a) and (b)
D. READY
 
 

Option: D

Explanation :

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reshma perveen said: (5:27am on Thursday 3rd September 2015)
Ya,read is assigned with enable low input,as well as write and in ta are also having enable low.these three r active low pins.while inter,ale,hold,hlda are active high pins,so enable kept high,while set,reset acts on 0,1
Avinash A said: (10:34pm on Sunday 27th August 2017)
READY is an active high input control.It is used by microprocessor to detect whether a peripheral has completed ( or is ready) the data transfer or not .The main function of this pin is to synchronize slower peripheral to faster microprocessor.

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2:   To put the microprocessor in the wait state
A. lower the HOLD input
B. lower the READY input
C. raise the HOLD input
D. None of these
 
 

Option: B

Explanation :

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3:   A basic instruction that can be interpreted by a computer generally has
A. An operand and an address
B. A decoder and an accumulator
C. Sequence register and decoder
D. None of these
 
 

Option: A

Explanation :

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4:   In a microprocessor system with memory mapped I/O
A. Devices have 8-bit addresses
B. Devices are accessed using IN and OUT instructions
C. There can be a maximum of 256 input devices and 256 output devices
D. Arithmetic and logic operations can be directly performed with the I/O data.
 
 

Option: D

Explanation :

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Avinash A said: (12:12am on Monday 28th August 2017)
Memory mapped IO uses 16bit address devices.Control signals used in memory mapped IO are MEMR(bar) MEMW(bar).All memory related instructions can be used in this.Data transfer between any register and IO.64K memory is shared between IO and system.Arithmetic or logical operations can be directly performed with IO data

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5:   The addressing mode used in an instruction of the form ADD X, Y, is
A. absolute
B. immediate
C. indirect
D. Relative
 
 

Option: A

Explanation :

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Syllabus included in this section is-

  • Machine instructions and addressing modes
  • ALU and data-path
  • CPU control design
  • Memory interface
  • I/O interface (Interrupt and DMA mode)
  • Instruction pipelining
  • Cache and main memory
  • Secondary storage
  • Hardwired and Microprogrammed processor design
  • Instruction formats 
  • Addressing modes
  •  Memory types and organisation
  • Interfacing peripheral devices
  • Interrupts
  • Microprocessor architecture
  • Instruction set and Programming (8085, P-III/P-IV)
  • Microprocessor applications.

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