A word is a group of 16 bits. But traditionally the boundary for a Word is defined as either 16-bits or the size of the data bus for the processor and a Double Word is Two Words. Therefore a Word and a Double Word is not a fixed size but varies from system to system depending on the processor.

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The Word

A word is a group of 16 bits. But traditionally the boundary for a Word is defined as either 16-bits or the size of the data bus for the processor and a Double Word is Two Words. Therefore a Word and a Double Word is not a fixed size but varies from system to system depending on the processor. However for conceptual reading, we will define a word as two bytes.

When we see a word on bit level, it will be numbered as the bits in a word starting from bit zero (b0) through fifteen (b15). The bit level representation will be as follows:

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0


Where bit 0 is the LSB (Least Significant Bit) and bit 15 is the MSB (Most Significant Bit). When there is need to refer the other bits in a word, their bit position number is used to refer them.

In this way a word contains exactly two bytes such that from Bit b0 to Bit b7 form the low order byte and bits b8 through b15 form the high order byte. With a word of 16-bits, we can represent 216 (65536) different values. These values may be of following:

 

  • The unsigned numeric values in the range of 0 to 65,535.
  •  The Signed numeric values in the range of -32,768 to +32,767
  •  Any data type with no more than 65,536 values. In this way words are mostly used for:
    • 16-bit integer data values
    • 16-bit memory addresses
    • Any number system requiring 16 bits or less

 


Sample Chapters from book DATA RECOVERY WITH AND WITHOUT PROGRAMMING by Author Tarun Tyagi
Data Recovery with & without Programming


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BPB Publications, New Delhi, India
540
81-7656-922-4
$69.00 (Including Shipping Charges, Cost of Book and Other expenses, Free Source Code CD included with the Book)





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