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Addressing Modes.
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Agenda:. Introduction Types Explanation in detail.
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Team members: 22EG105N12: B.Sathvika Reddy 22EG105N31: M.Bhavani.
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INTRODUCTION:. The term addressing modes refers to the way in which the operand of an instruction is specified. The addressing mode specifies a rule for interpreting or modifying the address field of the instruction before the operand is actually executed..
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Types of Addressing Modes:. Implied Addressing Mode Immediate Addressing Mode Direct Addressing Mode Indirect Addressing Mode Register Mode Register Indirect Mode Autoincrement or Autodecrement Mode Relative Addressing Modes.
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Implied Addressing Mode. Address of the operands are specified implicitly in the definition of the instruction - No need to specify address in the instruction EA = AC, or EA = Stack[SP] - Example instructions from Basic Computer: CLA, CME, INP.
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Immediate Addressing Mode. Instead of specifying the address of the operand, operand itself is specified - No need to specify address in the instruction - However, operand itself needs to be specified - Sometimes, require more bits than the address - Fast to acquire an operand.
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Direct Addressing Mode. Instruction specifies the memory address which can be used directly to access the memory - Faster than the other memory addressing modes - Too many bits are needed to specify the address for a large physical memory space EA = IR(addr) (IR(addr): address field of IR).
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Indirect Addressing Mode. A diagram of a computer system Description automatically generated.
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Register Mode. Address specified in the instruction is the register address - Designated operand need to be in a register - Shorter address than the memory address - Saving address field in the instruction - Faster to acquire an operand than the memory addressing EA = IR(R) (IR(R): Register field of IR).
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Register Indirect Mode. Instruction specifies a register which contains the memory address of the operand. - Saving instruction bits since register address is shorter than the memory address - Slower to acquire an operand than both the register addressing or memory addressing EA = [IR(R)] ([x]: Content of x).
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Autoincrement or Autodecrement Mode. When the address in the register is used to access memory, the value in the register is incremented or decremented by 1 automatically..
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Relative Addressing Modes. The Address fields of an instruction specifies the part of the address which can be used along with a designated register to calculate the address of the operand. - Address field of the instruction is short - Large physical memory can be accessed with a small number of addressbits EA = f(IR(address), R), R is sometimes implied.
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