ADE3000 查看數據表（PDF） - STMicroelectronics

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ADE3000

LCD Display Engines with Integrated DVI, ADC and YUV Ports

STMicroelectronics 

OSD Block

ADE3XXX

effects. An alpha value of 255 makes the OSD opaque, while a value of 0 makes the OSD invisible,

with a linear ramp of transparency between these two endpoints. Separate registers control alpha

for foreground and background pixels.

A fade-in/fade-out feature ramps the alpha values every six frames, starting from their current value

and going up or down the sequence: 0, 16, 32, 64, 128, 192, 224, 240, 255.

Row 15 also contains definitions for the four display windows. These windows define regions on the

screen to which borders and shadows can be applied. (They are not analogous to windows in a GUI

display, in that they do not represent four independent data displays. There is only one character

map. The windows essentially define an area around which a border can be drawn or to which

attributes can be assigned.) Windows also determine which of the two color tables will be used for

the characters inside. Windows have a fixed precedence: window 0 has the highest precedence

and window 3 the lowest. When windows overlap, the precedence determines which borders will be

displayed and which color tables will be used in the overlapping area.

Figure 9: Character Attribute Map

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

00

01

02

03

04

05

06

07

Character Attributes

08

09

10

11

12

13

14

15

wa

ga wa ga wa

00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

wa = window attributes

ga = global attributes

Monochrome and color fonts are affected differently by attribute bytes. Monochrome characters are

affected by shadows and borders, and have their color specified by the foreground/background

attributes. Color characters interpret the attribute byte differently than monochrome characters,

using it to define blinking and 90-degree rotations rather than blinking, foreground color, and

background color.

Color Tables

There are two color tables, each containing sixteen entries by three bytes each, giving a 24-bit RGB

value for each entry. Entry 0 is used for the shadow color for monochrome characters and borders.

Color-table selection is made on a window-by-window basis.

When writing the color table, the “row” value in the first header byte is interpreted as the color table

index, while the “column” value in the second header byte encoded to select the color table (0 or 1)

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