ST92196A datasheet(116/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

All colors are taken from a double Palette set

(Background and Foreground) which are both OS-

DRAM mapped and thus definable in real-time.

The priority of all color layers is, from highest to

lowest:

Mouse, underline, foreground & rounding, fringe,

background and border.

Character code 00h is a test character and has no

user customized content. It is always displayed

with a border color and will appear as a “non-dis-

played character”.

8.5.3.4 Character Matrix Definition

A character is described by a matrix of dots stored

in the Font ROM memory. Two matrix sizes are

can be used to define each character pattern: ei-

ther a 9x13 matrix or a 18x26 matrix. The matrix

size can be redefined for each row Display buffer;

mixing the 2 matrix sizes on a same screen is

therefore possible.

Refer to Figure 61, for an example of the Font

ROM content.

The 9x13 matrix is a compressed format where

each bit represents a 2x2 pixel dot (with no magni-

fication applied). In interlaced mode, for each dot,

2 pixels are generated on a field, the 2 others on

the other field; each row of the matrix is used for

both fields.

The 18x26 matrix is an “expanded” format where

each bit represents a 1x1 pixel dot (if no magnifi-

cation). In interlaced mode, if no magnification is

applied, each odd row of the matrix is displayed on

a field, each even row on the other field.

WARNING: As a result, when displaying the

18x26 matrix with no vertical magnification and in

interlaced mode, flicker may be visible on charac-

ters containing long single-pixel rows. To avoid

this effect, either use double pixel horizontal lines,

if possible, when designing the font (see Figure

53). Alternatively, use the double height attribute

or choose the foreground and background colors

for reduced contrast.

Figure 53. Avoiding Flicker on unmagnified 18x26 characters

Modified character design

with visible flicker

Original character design

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