ST92196A datasheet(148/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

SHAPE ATTRIBUTE - 9x13 MATRIX

Address in segment 22h: 2p+5+3z. See Figure 59.

Bit 7 = CODX

Character Code Extension

This bit is used with SPL[1:0] as the character ad-

dress extension. Thus it is possible to address any

of the 9x13 characters of the font ROM. (See the

SPL[1:0] bit description for more details)

Bits 6:5 = SPL[1:0]

Character Split control bits

These “character split” bits are used with the

CODX bit as the character address extension. It is

then possible to address any of the 9x13 charac-

ters of the font ROM.

If the character code is ChC[7:0] (1 byte), then the

character

addressed

with

this

structure

is:

CODX.SPL1.SPL0.ChC[7:0]

Bit 4 = FXP

Foreground Extended Palette ad-

dressing bit

This bit is combined with the PASW bit in the OS-

DDR register to give the MSB bit of the foreground

palette address. It allows the foreground palette,

(basic or extended), to be selected on a per-char-

acter basis. See Table 29 for details.

Table 29. Foreground Palette Selection

Bit 3 = BXP

Background Extended Palette ad-

dressing bit

This bit is combined with the PASW bit in the OS-

DDR register to give the MSB bit of the back-

ground palette address. It allows the background

palette, (basic or extended), to be selected on a

per-character basis. See Table 30 for details.

Bit 2 = FOC

Flash On Character control bit

This bit enables the flash mechanism for the cur-

rent character.

0: The flash mechanism is disabled. The current

character is displayed, whatever the flash row

attribute value (FON) is (see Section 8.5.8.3).

1: The flash mechanism is enabled. If the flash row

attribute (FON) is “on” (see Section 8.5.8.3), the

character is displayed as space using the back-

ground color.

Bit 1 = SHA

shadow mode control bit

This bit enables or disables a black shadow shape

on the right and bottom edges of the current char-

acter foreground.

0: No shadow is added

1: A black shadow is added on the current charac-

ter.

Note: This shadow shape follows the same algo-

rithm as the fringe (see Section 8.5.3.7 for further

details).

Bit 0 = FRC

Fringe on Character control bit

This bit enables or disables a fringe on the current

character foreground.

0: No fringe is added.

1: A fringe is added on the current character if the

fringe row attribute bit FR is set (see Section

8.5.8.3 for more details).

Note: The fringe follows the algorithm described in

Section 8.5.3.7.

CODX

SPL1

SPL0

FXP

BXP

FOC

SHA

FRC

PASW

FXP

Foreground palette used

basic

extended

basic

PASW

BXP

Background palette used

basic

extended

basic

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