N2990 データシートの表示（PDF） - Unspecified

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N2990

7-bit and 8-bit codes and their extension

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ISO/IEC 8859-4:1997 (E)

© ISO/IEC

ISO/IEC 2022:1994, Information technology –

The bit combinations may be interpreted to represent

Character code structure and extension techniques.

numbers in binary notation by attributing the

ISO/IEC 4873:1991, Information technology –

following weights to the individual bits:

ISO 8-bit code for information interchange –

Structure and rules for implementation.

Bit

Weight

b8 b7 b6 b5 b4 b3 b2 b1

128 64 32 16 8 4 2 1

ISO/IEC 8824-1:1995, Information technology –

Abstract Syntax Notation One (ASN.1): Specifica-

Using these weights, the bit combinations are

tion of basic notation.

identified by notations of the form xx/yy, where xx

4 Definitions

For the purposes of this part of ISO/IEC 8859 the

following definitions apply:

4.1 bit combination: An ordered set of bits used

for the representation of characters.

4.2 byte: A bit string that is operated upon as a unit.

4.3 character: A member of a set of elements

used for the organization, control, or representation

of data.

4.4 code table: A table showing the characters

allocated to each bit combination in a code.

4.5 coded character set; code: A set of

unambiguous rules that establishes a character set

and the one-to-one relationship between the

and yy are numbers in the range 00 to 15. The

correspondence between the notations of the form

xx/yy and the bit combinations consisting of the bits

b8 to b1 is as follows:

– xx is the number represented by b8, b7, b6 and b5

T where these bits are given the weights 8, 4, 2, and

1 respectively.

– yy is the number represented by b4, b3, b2 and b1

where these bits are given the weights 8, 4, 2, and

X 1 respectively.

The bit combinations are also identified by notations

of the form hk, where h and k are numbers in the

range 0 to F in hexadecimal notation. The number

E h is the same as the number xx described above,

and the number k the same as the number yy

Tdescribed above.

characters of the set and their bit combinations.

4.6 coded-character-data-element (CC-data-

element): An element of interchanged information

that is specified to consist of a sequence of coded

representations of characters, in accordance with

L one or more identified standards for coded

character sets.

4.7 graphic character: A character, other than a

control function, that has a visual representation

normally handwritten, printed or displayed, and that

A has a coded representation consisting of one or

more bit combinations.

NOTE – In ISO/IEC 8859 a single bit combination is used

to represent each character.

IN 4.8 graphic symbol: A visual representation of a

graphic character or of a control function.

4.9 position: That part of a code table identified

by its column and row coordinates.

F 5 Notation,19c97-o11-1d1 e table, and names

5.2 Layout of the code table

An 8-bit code table consists of 256 positions

arranged in 16 columns and 16 rows. The columns

and the rows are numbered 00 to 15. In hexa-

decimal notation the columns and the rows are

numbered 0 to F.

The code table positions are identified by notations

of the form xx/yy, where xx is the column number

and yy is the row number. The column and row

numbers are shown at the top and left edges of the

table respectively. The code table positions are

also identified by notations of the form hk, where h

is the column number and k is the row number in

hexadecimal notation. The column and row

numbers are shown at the bottom and right edges of

the table respectively.

The positions of the code table are in one-to-one

correspondence with the bit combinations of the

code. The notation of a code table position, of the

form xx/yy, or of the form hk, is the same as that of

5.1 Notation

the corresponding bit combination.

The bits of the bit combinations of the 8-bit code are

identified by b8, b7, b6, b5, b4, b3, b2, and b1, where

b8 is the highest-order, or most-significant bit and b1

is the lowest-order, or least-significant bit.

5.3 Names and meanings

This part of ISO/IEC 8859 assigns a unique name

and a unique identifier to each graphic character.

These names and identifiers have been taken from

2

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