ST92185B2 datasheet(110/178 Pages) STMICROELECTRONICS

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ST92185B - 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 R, G, B and FB pins of the ST92195/

ST92R195 are analog outputs controlled by true

Digital to Analog Converters. These outputs are

specially designed to directly drive the Video Pro-

cessor.

The R, G and B outputs are referred to Ground

and they can drive up to 1.0V; they are loaded on-

chip by a 0.5K ohms typical load.

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 FB (fast switch) output is also referred to

Ground and can drive up to 3.0V with an on-chip

0.5K ohm load. This analog FB output provides the

best phase matching with the R, G, B signals.

An example of the Fast Blanking Signal is shown

in Figure 6.

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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