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ST92195C/D - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

7.4.4.4 Font Selection using Parallel Attributes

Parallel attributes have an immediate effect. They

are applied to the associated character. These at-

tributes can also have a “serial” effect, the defined

attribute being still defined on the following charac-

ters: this is known as attribute propagation.

Shape attributes (US,DH,BX,SR) are propagated

when PS is toggled to 0. In the same way, color at-

tributes are propagated when PS is toggled to 1.

CSS has two kinds of behaviour:

– If PS is set once, the CSS attribute is applied on

the current character only.

– If PS is set twice, the CSS of the first character

with PS=1 is propagated.

Note: The value stored as a preceding CSS value

is forced when alpha or mosaic color serial at-

tributes are used. Alpha serial attributes reset the

memorized CSS: Mosaic serial attributes set the

memorized CSS.

Table 22. Font Selection using Parallel Attributes

In the example in Table 23 Example of Character

Set Selection,, a string of six characters is dis-

played. In the line “Display with” we can see that,

starting from Char(n) and ending with Char n+2,

the CSS setting made at Char (n-2) is propagated.

Table 23. Example of Character Set Selection

Parallel

Attribute

Character Code

Character

Definition

PS= 0

00..1F

32 Control Characters (serial attributes function table)

20..7F

96 Basic Characters chosen from G0 or G1 font

80..FF

128 extended characters G2-based X/26 and Menu Characters

PS= 1

CSS used for character

set selection

00..1F

32 Control Characters (serial attributes function table)

20..7F

CSS= 0: G0 or G1 selection depending on color serial attribute

CSS= 1: G1 selection

80..FF

CSS= 0: Select G2-based X/26 + Menu

CSS= 1: Select extended Menu + 32 reserved characters

Char(n-2)

Char(n-1)

Char(n)

Char(n+1)

Char(n+2)

Char(n+3)

PS=

CSS=

CSSn-2

CSSn-1

none

CSSn+2

CSSn+3

Display with

CSSn-2

CSSn-1

CSSn-2

CSSn+2

CSSn+3

Stored CSS

CSSn-2

CSSn+2

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