Physical addressing in the 8086 microprocessor refers to the method by which the CPU accesses memory locations using a combination of segment and offset addresses. The 8086 employs a segmented memory model, where memory is divided into segments, and each segment has a base address. The physical address is calculated by shifting the segment address left by 4 bits and adding the offset address, resulting in a 20-bit physical address space that allows the processor to access up to 1 MB of memory. This system enables more efficient memory management and allows programs to use memory in a modular way.
800ns
indexed addressing
displacement from base address
The operand addressing modes of the 8086/8088 are ...ImmediateRegisterDirectIndirectWithin the Indirect category there is ...BaseIndexBase + IndexBase + DisplacementIndex + DisplacementBase + Index + Displacement
i.e.-->mov ax,2000h (in 8086)
different architecture.
Physical address in the 8086/8088 is {Selected Segment Register} * 16 + {Effective Offset Address}. It is a 20-bit address .
Immediate addressing mode is when one of the operands is "immediately" located after the opcode. It is more correct to say that the operand is part of the instruction.
Immediate addressing mode is when one of the operands is "immediately" located after the opcode. It is more correct to say that the operand is part of the instruction.
there are five addressing modes in 8086 they are : 1->direct addressing 2->Indirect addressing 3->index addressing 4->immediate addressing 5->register addressing
The 8086 microprocessor supports several data addressing modes, including immediate, direct, indirect, indexed, and based addressing modes. In immediate addressing, the operand is specified directly in the instruction. Direct addressing involves providing the memory address of the operand. Indirect addressing uses a pointer in a register to reference the operand's memory location, while indexed addressing combines a base address with an offset from an index register. Additionally, based addressing uses a base register to locate the operand in memory.
The 8086 was only capable of addressing 1Mbyte of memory. It was divided into segments of 65536 bytes (64 KB) each meaning about 16 segments.