Instruction cycle with interrupts

Instruction cycle with interrupts

• 1.
  -SHUBHAM JAIN MCA( SEC1)
• 2.
  WHAT IS INSTRUCTION? • A group of bits that tell the computer to perform a specific operation. • The instructions of a program are stored in memory. • The CPU reads the next instruction from memory. • It is placed in an Instruction Register (IR).
• 3.
  INSTRUCTION FORMAT
• 4.
  BASIC COMPUTER INSTRUCTIONS
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  CONTROL UNIT OFBASIC COMPUTER
• 6.
  INSTRUCTION CYCLE A instructionis executed in three phases : – Fetch an instruction from memory – Decode the instruction. – Read the effective address from memory if the instruction has an indirect address. (OPTIONAL) – Execute the instruction.
• 7.
  D'7IT3: AR M[AR] D'7I'T3:Nothing D7I'T3: Execute a register-reference instr. D7IT3: Execute an input-output instr
• 8.
  MEMORY REFERENCE INSTRUCTIONS
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  REGISTER REFERENCE INSTRUCTIONS
• 10.
  INPUT – OUTPUTINTERRUPT
• 11.
  INPUT – OUTPUTINSTRUCTIONS
• 12.
  INTERRUPT CYCLE