These are also known as General Purpose Registers. Mainly used for Data Operation, Logics Calculation &

Manipulation of Data.

Data Registers

Data Registers

Data Registers

Memory Organization & Aligned & Misaligned Data

Memory Organization & Aligned & Misaligned Data

To store a Word of 16-Bit, two consecutive Memory locations are required. Lower Byte would be stored in Lower Address of two consecutive bytes while higher byte would be stored in higher address of consecutive byte.

Like to store data of 16-Bit i.e. 625A H

5A = Lower Byte in 00001H

62 = Higher Byte in 00002H.

Memory Organization & Aligned & Misaligned Data

Memory Organization & Aligned & Misaligned Data

Aligned Words are those which started with Address whose Least Significant Bit is ‘0’ also called Even Physical Address.

Non-aligned Words are those which started with Address whose Least Significant Bit is ‘1’ also called Odd Physical Address.

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Number stored in fig ( a) is 5502H, in (b) is FDAAH

Note: least significant byte is stored at lower address.

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Example In (b) segment base address A000H and Offset 55FFH are stored

Offset is stored first and segment base address is stored next

This is an example of double-word pointer storing.

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DATA TYPES Byte, Word (16 bits), Double Word(32 bits)

Unsigned Byte Integer

Signed Byte Integer

Unsigned Word Integer (16 bits)

Signed Word Integer

Floating-point (real) numbers will be discussed later

BCD Numbers (Unpacked and Packed)

ASCII Code

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