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ST92R195C - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY
(Cont’d)
8.4.4.11 Cursor Control
I
Horizontal position (by character)
I
Vertical position (by row)
I
Color or Underline Cursor Modes
I
Color Cursor with inverted foreground / inverted
background
I
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”.
8.4.5 Vertical Scrolling Control
I
Top-Down or Bottom-Up shift
I
Freeze Display function
I
Shift speed control
I
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
8.4.5.1 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 with the RGB signals.
An example of the Fast Blanking Signal is shown
in
Figure 53
.
The TLSU pin is a digital output (0-5V).
R/G/B DAC code
0
0
0
1
1
1
Display aspect during FB
No Color
Half-
Intensity
Color
Full-
Intensity
Color
0
1
1