ADE3250 datasheet(69/88 Pages) STMICROELECTRONICS

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ADE3XXX

OSD Block

and the primary color (red, green, or blue). The data byte following the second header byte is

written to the selected (table, index, primary) location.

Font Data

Font data is sent to the OSD through burst transfers. The first header byte selects the transfer type

and provides three bits of the character index, while the second header byte selects transfer type

“C” and gives the remaining five bits of offset. The data bytes for the character follow, given from top

to bottom and left to right in the character cell.

A monochrome character is 27 bytes long, with two scan-lines occupying three bytes. A color

character is four times as long as a monochrome character (108 bytes), with each byte containing

two four-bit pixels. Both color and monochrome fonts are 12 pixels wide and 18 high.

Transfer Formats

The transfer format consists of two header bytes and a variable number of data bytes. The header

bytes determine the type of transfer (character, attribute, monochrome font, color font, or color

table). Addressing is by row and column in the case of character or attribute transfers, and by

character index in the case of font transfers.

When writing to the color table, the “column” field determines the color table and R/G/B selection.

Table 23: 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

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