ST92185B STMicroelectronics, ST92185B Datasheet - Page 110

• Manufacturer Part Number: ST92185B
• Description: 16k/24k/32k Rom Hcmos Mcu With On-screen-display
• Manufacturer: STMicroelectronics

ST92185B - ON SCREEN DISPLAY (OSD)
ON SCREEN DISPLAY (Cont’d)
7.4.4.11 Cursor Control
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
2. Ghost fringing: assuming a cursor operation in
3. Static or flash cursor Mode: the horizontal cur-
7.4.5 Vertical Scrolling Control
Scrolling is performed in a programmable rolling
window if the characters are in normal height.
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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”.
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).
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”.
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
Top-Down or Bottom-Up shift
Freeze Display function
Shift speed control
Double Height Display scrolling
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
2. In Parallel (Level 1+) mode, scrolling is possible
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
The TLSU pin is a digital output (0-5V).
R/G/B DAC code
be used in Line mode
without serial attributes DS and DH.
Figure
0
0
1
0
1
1
6.
0
1
1
Display aspect during FB
Half-
Full-
Intensity
Intensity
No Color
Color
Color