ST92196A datasheet(147/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

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 Figure 59.

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 Section 8.5.8.2).

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 Section 8.5.8.3).

CHARACTER CODE IN EXTENDED PARALLEL

MODE

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

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 Figure 59.

Refer to Section 8.5.8.6 for the bit description.

CHC7

CHC6

CHC5

CHC4

CHC3

CHC2

CHC1 CHC0

FP3

FP2

FP1

FP0

BP3

BP2

BP1

BP0

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