ST92196A STMicroelectronics, ST92196A Datasheet - Page 148

• Manufacturer Part Number: ST92196A
• Description: 8/16-bit Mcu For Tv Applications With Up To 96k Rom, On-screen-display And 1 Or 2 Data Slicers
• Manufacturer: STMicroelectronics

OSD CONTROLLER (Cont’d)
SHAPE ATTRIBUTE - 9x13 MATRIX
Address in segment 22h: 2p+5+3z. See
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. 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
CODX SPL1
PASW
0
0
1
1
7
FXP
0
1
0
1
SPL0
Table 29
Foreground palette used
basic
extended
extended
basic
FXP
Table 30
for details.
BXP
FOC
for details.
SHA
Figure
FRC
0
59.
- ON SCREEN DISPLAY CONTROLLER (OSD)
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
1: The flash mechanism is enabled. If the flash row
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-
Note: This shadow shape follows the same algo-
rithm as the fringe (see
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
Note: The fringe follows the algorithm described in
Section
PASW
0
0
1
1
character is displayed, whatever the flash row
attribute value (FON) is (see
attribute (FON) is “on” (see
character is displayed as space using the back-
ground color.
ter.
fringe row attribute bit FR is set (see
8.5.8.3
8.5.3.7.
for more details).
BXP
0
1
0
1
Background palette used
basic
extended
extended
basic
Section 8.5.3.7
Section
Section
8.5.8.3), the
Section
8.5.8.3).
for further
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