8086 Microprocessor & Peripherals Notes eBook

8086 Microprocessor & Peripherals Notes eBook
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8086 Microprocessor & Peripherals Notes eBook

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content of a segment register also called as segment address, and content of an offset register also called as offset address. To get total physical address, put the lower nibble 0H to segment address and add offset address. The fig 1.3 shows formation of 20-bit physical address. 15
0
OFFSET VALUE 19
0
5
SEGMENT REGISTER
0H
ADDER
20 BIT PHYSICAL ADDRESS
Fig. 1.3. Physical address formation
10
Register organization of 8086 8086 has a powerful set of registers containing general purpose and special purpose registers. All the registers of 8086 are 16-bit registers. The general purpose registers, can be used either 8-bit registers or 16-bit registers. The general purpose registers are either used for holding the data, variables and intermediate results temporarily or for other purpose like counter or for storing offset address for some particular addressing modes etc. The special purpose registers are used as segment registers, pointers, index registers or as offset storage registers for particular addressing modes. Fig 1.4 shows register organization of 8086. We will categorize the register set into four groups as follows
General data registers AX BX CX
AH AL BH BL
SP BP
CS