ST92196A STMicroelectronics, ST92196A Datasheet - Page 119

• Manufacturer Part Number: ST92196A
• Description: 8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
• Manufacturer: STMicroelectronics

OSD CONTROLLER (Cont’d)
8.5.3.8 Scrolling
The row RAM buffer architecture of the Display al-
lows all scrolling operations to be performed very
easily by software: scroll up, scroll down, scroll
left, scroll right and any horizontal/vertical mix.
In addition to the character row scrolling, a vertical
“smooth” scrolling has been implemented. It re-
quires defining the “active range” for each dis-
played row (refer to
8.5.3.9 Color Palettes
The Display controller provides 4 user-definable
palettes: two 16-color foreground palettes (one ba-
sic and one extended), and two 16-color back-
ground palettes (one basic and one extended).
Each color is defined using 16 bits:
– Foreground palette: 3 bits for red level, 3 bits
– Background palette: 3 bits for red level, 3 bits
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- ON SCREEN DISPLAY CONTROLLER (OSD)
for green level, 3 bits for blue level, 3 bits for
translucency, and 3 bits for the underline mode
control.
for green level, 3 bits for blue level, 3 bits for
translucency, and 1 bit for immediate color
change control.
Section
8.5.8.4).
Two palettes are always available (one foreground
palette and one background palette). The 2 other
palettes are only accessible in extended parallel
mode.
The palettes available in serial and basic parallel
modes depend on the value of the PASW bit in the
OSDDR register.
8.5.3.10 Underline Mode Control
The OSD is able to underline any character of the
9x13 or 18x26 matrix with 3 different colors select-
ed from a palette, and 2 different dot lines.
Using 3 bits (see the Color Palettes paragraph
above), it is possible to define the underline mode
associated with each foreground palette entry.
In 9x13 mode, single or double underline can be
set on lines 12 and 13 with the foreground color or
two specific colors defined in underline color sets 1
& 2.
In 18x26 mode, single or double underline can be
set on lines 23-24 and 25-26 with the foreground
color or two specific colors defined in underline
color sets 1 & 2.
For more details please refer to
Section
8.5.6.