Addressing modes in 8086 microprocessor. So in addition to byte, word (16-bit) has to be stored in the memory. The 8086 microprocessor is a16-bit, N-channel, HMOS microprocessor. Note that the 8086 does not work the whole 1MB memory at any given time. However it works only with four 64KB segments within the whole 1MB memory. It was mentioned there that this category of addressing modes is further classified. A segment is a logical unit of memory that may be up to 64 kilobytes long. Microprocessor - 8086 Addressing Modes - The different ways in which a source operand is denoted in an instruction is known as addressing modes. There are 8 different addressing modes in 8086 … This specifies that the given data is an immediate data or an address. Each segment is made up of contiguous memory locations. Starting address will always be changing. It will not be fixed. A segment is a logical unit of memory that may be up to 64 kilobytes long. The number of address lines in 8086 is 20, 8086 BIU will send 20bit address, so as to access one of the 1MB memory locations.

Types of addressing modes: … Intel 8086 is built on a single semiconductor chip and packaged in a 40-pin IC package. Where the HMOS is used for " High-speed Metal Oxide Semiconductor ". Program Memory Addressing Mode of 8086 Microprocessor In the previous article Categories of Addressing Modes of 8086 microprocessors , we learned about a category- Program memory addressing mode .

Memory Addressing Modes of 8086: Most of the memory ICs are byte oriented i.e. It also specifies whether the given operand is register or register pair. each memory location can store only one byte of data. The 8086 is a 16-bit microprocessor, it can transfer 16-bit data. The four segment registers actually contain the upper 16 bits of the starting addresses of the four memory segments of 64 KB each with which the 8086 is working at that instant of time. It is independent, separately addressable unit. Prerequisite – Addressing modes, Addressing modes in 8085 microprocessor The way of specifying data to be operated by an instruction is known as addressing modes.