Based , Indexed & Based Indexed Memory Operand Addressing Modes in 8086 Microprocessor
#BasedAddressingMode #IndexedAddressing Modes #BasedIndexedAddressingMode #8086 #MemoryOperand #EffectiveAddress
This video tutorial explains three crucial types of Memory Operand Addressing mode in the 8086 microprocessor. These types include Based, Indexed and Based Indexed Addressing modes.
This video is the last video of the three tutorials about addressing modes used in the 8086 microprocessor.
There are three types of Addressing modes
1) Register operand addressing mode " • Immediate Operand Addressing Mode in ... "
2) Immediate operand addressing mode " • Register Operand Addressing Mode in 8... "
3) Memory operand addressing mode. " • Direct Memory Operand Addressing Mode... "
The first video explained the former two types, " • Register & Immediate Operands Address... " with an example. In contrast, this video tutorial explains about memory operand addressing mode.
In Memory addressing mode, one of the operands is stored in a memory location. In the last tutorial, we have learned that the physical address of any memory location is calculated using the Segment Base Address and Effective Address (Offset Address). The effective address is further composition of Base, Index, and Displacement. (EA= BASE+INDEX+ DISPLACEMENT). " • Direct Memory Operand Addressing Mode... "
So there are can be various combinations to produce an Effective address (or the offset ), and these different ways become the reason for following different types of Memory Operand Addressing mode.
1-Direct Memory Operand Addressing Mode " • Direct Memory Operand Addressing Mode... "
2-Register Indirect Memory Operand Addressing Mode " • Register Indirect Memory Operand Addr... "
3-Based Memory Operand Addressing Mode " • Based Memory Operand Addressing Mode "
4-Indexed Memory Operand Addressing Mode " • INDEXED MEMORY OPERAND ADDRESSING MODE "
5-Based Indexed Memory Operand Addressing Mode " • BASED INDEXED MEMORY OPERAND ADDRESSI... ". Last Three types Based , Indexed and Based Indexed Addressing modes are covered in this video tutorial. While rest types are covered in last two tutorials.
" • Direct Memory & Register Indirect Mem... " & " • Register & Immediate Operands Address... "
There are different ways to specify the address of the operands for any given operations, such as load, add, or branch. The various forms of determining the address of the operands are called addressing modes. Addressing modes are defined as " different ways in which a processor can access data (operands)." Addressing modes are concerned with operands which can be either source operand or destination operand. The source operand can be one of three Immediate operands, memory location & Register operand. At the same time, the destination operand can be either of two memory locations or register operand.
You can watch a short video that defines Addressing mode, Types, and related concepts. " • Addressing Mode in 8086 Microprocesso... "
This lecture is prepared from the textbook The 8086 and 8088 Microprocessors Programming, Interfacing, Software, Hardware and Applications by Walter A. Triebel, Avtar Singh.
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