ST92196A datasheet(146/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

Foreground Serial Attribute

Address in Segment 22h: 2p + 5 + z. See Figure

Bit 5 = FLA

Flash control bit

This bit controls the flashing feature (see Section

0.2.4.2).

0: All the following characters in the row are not af-

fected by the flashing mechanism.

1: All the following characters in the row follow the

flashing mechanism.

Note: Flashing characters are alternatively dis-

played as spaces and in normal mode (non-flash-

ing), depending on the value of the FON bit in the

Row Attribute byte (see Section 8.5.8.3).

The flash rate is controlled by software by toggling

the "FON" bit.

Bit 4 = IT

Italics control bit

This bit enables the italic feature for the row. (See

Section 8.5.3.6)

0: Italics are disabled.

1: All the following characters, until the end of the

row, or the next foreground serial attribute are

displayed in italics.

Note: Italics mode is only available in serial mode.

Bits 3:0 = FP[3:0]

Foreground Palette pointer

The FP[3:0] value points to one of the 16 prede-

fined entries of the foreground palette for fore-

ground color, translucency and underline style of

all the following characters (see Section 8.5.6.3).

For example, FP[3:0] = 0 points to the first fore-

ground palette entry, 10h & 11h if the palette swap

bit PASW of the OSDDR register is reset.

8.5.8.6 Basic Parallel Mode

In basic parallel mode, each character code (1

byte) is followed by a palette attribute (1 byte). See

Figure 59.

Let’s assume that the start address of the current

row buffer is 2p (even address).

In this case the character codes are stored in OS-

DRAM at the address 2p+4+2z, and the palette at-

tributes are stored in the OSDRAM at the address

2p+5+2z, where z ranges from 1 to RCN (RCN is

the row character count defined in Section

8.5.8.2).

The character code structure allows pointing to the

first 256 characters of the font ROM (the character

code value = the character number in font ROM).

CHARACTER CODE IN BASIC PARALLEL

MODE

Address in Segment 22h: 2p+4+2z. See Figure

59.

Bits 7:0 = CHC[7:0]

Character Code in basic par-

allel mode

The CHC[7:0] value points to one of the first 256

characters stored in the font ROM.

PALETTE ATTRIBUTE

Address in segment 22h: 2p+5+2z. See Figure 59.

Bits 7:4 = FP[3:0]

Foreground Palette pointer

The FP[3:0] value points to one of the 16 prede-

fined entries of the foreground palette for the fore-

ground color, the translucency and the underline

style of all the following characters (see Section

8.5.6.3 for further details).

For example, FP[3:0] = 0 points to the first fore-

ground palette entry, 10h & 11h if the palette swap

bit PASW of the OSDDR register is reset (see reg-

isters description for more details).

Bits 3:0 = BP[3:0]

Background Palette pointer

The BP[3:0] value points to one of the 16 prede-

fined entries of the background palette for the

background color and the translucency.

For example, BP[3:0] = 0 points to the first back-

ground palette entry, 30h & 31h if the palette swap

bit PASW of the OSDDR register is reset (see reg-

isters description for more details).

Note: the background color of the character is af-

fected by the use of the “M” bit located in the Back-

ground Palette (see Section 8.5.6.4).

FLA

FP3

FP2

FP1

FP0

CHC7

CHC6

CHC5

CHC4

CHC3

CHC2

CHC1 CHC0

FP3

FP2

FP1

FP0

BP3

BP2

BP1

BP0

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