ST92195D datasheet(114/249 Pages) STMICROELECTRONICS

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ST92195C/D - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

7.4.4.11 Cursor Control

Horizontal position (by character)

Vertical position (by row)

Color or Underline Cursor Modes

Color Cursor with inverted foreground / inverted

background

Flash or Steady mode Color Cursor

Cursor display is controlled using two registers:

– Cursor Horizontal Position R246 (F6h) Page 32

– Cursor Vertical Position R247 (F7h) Page 32.

Notes:

1. Cursor operation in “Underline” mode: any

screen location where the foreground color is

identical to the background color behaves as a

“lost cursor” (i.e. cursor not visible). Assuming a

serial mode display, the screen location placed

on the lower row after a double height character

will lead to a “lost cursor”.

2. Ghost fringing: assuming a cursor operation in

color inversion mode, assuming a serial mode

display, assuming the fringe is activated, the

screen location placed on the lower row after a

double height character may show a “ghost

fringing” effect (the ghost color being an

inverted background one).

3. Static or flash cursor Mode: the horizontal cur-

sor value indicates the character position (i.e.

first character pointed with a “1” value); in

Underline Mode, the horizontal cursor value

gives the position minus “1”.

7.4.5 Vertical Scrolling Control

Top-Down or Bottom-Up shift

Freeze Display function

Shift speed control

Double Height Display scrolling

Scrolling is performed in a programmable rolling

window if the characters are in normal height.

In Line mode, the scrolling window must be entire-

ly filled by programmed rows (each scrolled loca-

tion is defined by one of the 11 available rows).

Notes:

1. 80-characters combined with scrolling can only

be used in Line mode

2. In Parallel (Level 1+) mode, scrolling is possible

without serial attributes DS and DH.

Use these two registers to control scrolling:

– Scrolling Control Low R248 (F8h) Page 32

– Scrolling Control High R249 (F9h) Page 32

7.4.5.1 RGB & FB DAC and TSLU Outputs

The RGB and FB pins of the ST92195C/D are an-

alog outputs controlled by true Digital to Analog

Converters. These outputs are specially designed

to directly drive the Video Processor.

The effective DAC output level is controlled by a 3

bit digital code issued by the display control logic

with respect to the real time value of R, G or B and

the Half-Intensity control bit, as follows:

The analog FB output provides the best phase

matching for RGB signals.

An example of the Fast Blanking Signal is shown

in Figure 54 on page 102.

The TLSU pin is a digital output (0-5V).

R/G/B DAC code

Display aspect during FB

No Color

Half-

Intensity Color

Full-

Intensity Color

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