ADE3700 datasheet(65/89 Pages) STMICROELECTRONICS

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ADE3700

On-Screen Display (OSD)

Table 21: OSD Access Header Definition

Header Byte

Bits

Description

First

[7:4]

Type of data transfer. Valid values are:

0x8: screen map

0x9: color LUT

0xA: attribute map

0xC: font data

all others: Reserved

[3:0]

For screen map or attribute map access, this is the row index.

For color LUT access, this is the color index.

For font data access, bits [2:0] are the MSB’s of the character index.

Second

[7:6]

Type of data burst:

0x0: A/B modes: Only one data byte follows this header byte.

0x1: C mode: All bytes following this header byte are data bytes until the serial interface

indicates an end-of-transmission. The OSD internally auto-increments after each byte. In

screen and attribute map access modes the column number is incremented after each byte,

wrapping to the beginning of the next row once column 29 is passed and wrapping to row 0 if

row 14 is passed.

Either mode may be used for display and character attribute modes, except for the off-screen

attributes in column 15 and row 30, which must use mode A/B. Font definition mode must use

mode C.

[5]

must be set to zero

[4:0]

In screen and attribute map access modes, this is the column number.

In font data access mode, this gives the 5 lsb’s of the character index.

In color LUT access mode, it selects the table number and color to be written:

0x0: LUT 0, red

0x1: LUT 0, green

0x2: LUT 0, blue

0x3: LUT 1, red

0x4: LUT 1, green

0x5: LUT 1, blue

0x6 - 0x7: Reserved

Table 22: OSD Attribute Map Definition (Sheet 1 of 4)

Row

Column

Bits

Description

[7:0]

Vertical OSD position / 4

[7:0]

Horizontal OSD position / 5

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