ST92196A STMicroelectronics, ST92196A Datasheet - Page 147

• 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)
8.5.8.7 Extended Parallel Mode
In extended parallel mode, each character code (1
byte) is followed by a palette attribute (1 byte) and
a shape attribute (1 byte). Refer to
Let’s assume that the start address of the current
row buffer is 2p (even address).
The character codes are stored in the OSDRAM at
the address 2p+3+3z, the palette attributes are
stored at the address 2p+4+3z, and the shape at-
tributes are stored at the address 2p+5+3z, where
z range value is 1 to RCN (RCN is the row charac-
ter count defined in
The character code structure, using the shape at-
tribute, allows you to point to any of the font ROM
characters.
The shape attribute definition depends on the font
matrix used for the row (it depends on the FM bit,
see
147/268
- ON SCREEN DISPLAY CONTROLLER (OSD)
Section
8.5.8.3).
Section
8.5.8.2).
Figure
59.
CHARACTER CODE IN EXTENDED PARALLEL
MODE
Address in segment 22h: 2p+3+3z. See
Bits 7:0 = CHC[7:0] Character Code in extended
parallel mode
The CHC[7:0] bits are used, combined with 3 or 1
bits of the shape attribute (for a 9x13 or 18x26 ma-
trix), to point to any of the characters stored in the
font ROM (refer to the shape attribute description
for more details).
PALETTE ATTRIBUTE
Address in segment 22h: 2p+4+3z. See
Refer to
CHC7 CHC6
FP3
7
7
FP2
Section 8.5.8.6
CHC5
FP1
CHC4 CHC3 CHC2 CHC1 CHC0
FP0
for the bit description.
BP3
BP2
BP1
Figure
Figure
BP0
0
0
59.
59.