ADE3700XT datasheet(62/89 Pages) STMICROELECTRONICS

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On-Screen Display (OSD)

ADE3700

62/89

2.15

On-Screen Display (OSD)

The integrated On-Screen Display (OSD) controller is a character-based overlay with a high level of

features and over 100 kbits of on-board dedicated RAM storage.

15 row by 30 column character-mapped display

Four user-definable windows

12x18-pixel characters with optional horizontal and vertical doubling on a row-by-row basis

Two 16-entry 24-bit RGB user-definable color maps

192 RAM-based monochrome 1 bpp characters

64 RAM-based graphics 4 bpp characters

Text character attributes: foreground/background color, blinking

Graphics character attributes: per-pixel color, vertical/horizontal mirroring

Row attributes: double width, double height

Window attributes: window visibility, position, size, border shadow, color table

Global attributes: OSD visibility, OSD screen position, alpha fade in/fade out, global size

doubling, rotation in ninety-degree increments

Single-bit enable/disable

For information on OSD programming, see the OSD Programming Manual.

2.15.1 OSD Access via I2C

The OSD uses a dedicated memory space that is accessed through an I2C port. The data stream

sent to the OSD register starts with two header bytes. These specify the type of transfer and the

row/column position for screen map transfers, the character index for font definition transfers, or the

color index for color map transfers.

A stream of OSD writes to the OSD I2C register can fill in a segment of the OSD memory space with

an internal auto-incrementing index register. The protocol is as follows:

1. Issue a start sequence with the R/W bit set to W.

2. Write to the OSD register. The first byte transferred is the index of the first internal OSD

bytes are written to successive internal OSD registers.

3. Continue writing data bytes until the desired range of OSD internal registers has been written

(the ADE3700 device will issue an ACK on each transfer).

4. Issue an I2C stop sequence.

SRGB_GAMMA_B_GREEN_A

0x0D25

R/W

[7:0]

0x0

Parametric Gamma A Green, Gamma

SRGB_GAMMA_B_GREEN_B

0x0D26

R/W

[7:0]

0x0

Parametric Gamma B Green, Contrast

SRGB_GAMMA_B_GREEN_C

0x0D27

R/W

[7:0]

0x0

Parametric Gamma C Green, Brightness

SRGB_GAMMA_B_BLUE_A

0x0D28

R/W

[7:0]

0x0

Parametric Gamma A Blue, Gamma

SRGB_GAMMA_B_BLUE_B

0x0D29

R/W

[7:0]

0x0

Parametric Gamma B Blue, Contrast

SRGB_GAMMA_B_BLUE_C

0x0D2A

R/W

[7:0]

0x0

Parametric Gamma C Blue, Brightness

Table 20: sRGB Registers (Sheet 3 of 3)

Addr

Mode

Bits

Default

Description

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