ST92196A datasheet(119/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

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 Section 8.5.8.4).

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

for green level, 3 bits for blue level, 3 bits for

translucency, and 3 bits for the underline mode

control.

– Background palette: 3 bits for red level, 3 bits

for green level, 3 bits for blue level, 3 bits for

translucency, and 1 bit for immediate color

change control.

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.

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