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ST92195 ST92T195 ST92E195 - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont’d)
7.4.4.11 Cursor Control
s
Horizontal position (by character)
s
Vertical position (by row)
s
Color or Underline Cursor Modes
s
Color Cursor with inverted foreground / inverted
background
s
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
“l(fā)ost 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 “l(fā)ost 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
s
Top-Down or Bottom-Up shift
s
Freeze Display function
s
Shift speed control
s
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
0
No Color
0
1
Half-
Intensity Color
1
Full-
Intensity Color