ST92196A datasheet(126/268 Pages) STMICROELECTRONICS

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- ON SCREEN DISPLAY CONTROLLER (OSD)

OSD CONTROLLER (Cont’d)

8.5.5.2 Row Buffer Description

The start address for each buffer must be even.

Starting from address 2p+6, write a string corre-

sponding to the character codes and the possible

attributes as in the example below:

8.5.5.3 OSDRAM Mapping Example 1

The left column of Figure 60 gives an example of

OSDRAM mapping for the following configuration:

– The display uses basic parallel mode

– Only the two basic color palettes are used

– 36 characters are displayed per row

– The First Buffer Start Address (to be stored in

0002h and 0003h) is 0050h

– The Next Buffer Start Address to be stored in

buffer 1 (address 0050h and 0051h) is 409Eh

(009Eh is the address of buffer 2, and 40h is the

code for basic parallel mode. Refer to Section

8.5.8.1).

– The Next Buffer Start Address to be stored in

buffer 2 (address 009Eh and 009Fh) is 4050h

(0050h is the address of buffer 1, and 40h is the

code for basic parallel mode. Refer to Section

8.5.8.1 for more details).

8.5.5.4 OSDRAM Mapping Example 2

The right column of Figure 60 gives an example of

OSDRAM mapping for the following configuration:

– The display uses extended parallel mode

– The four color palettes are used

– 36 characters are displayed per row

– The First Buffer Start Address (to be stored in

0002h and 0003h) is 0090h

– The Next Buffer Start Address to be stored in

buffer 1 (address 0090h and 0091h) is 8102h

(0102h is the address of buffer 2, and 80h is the

code for extended parallel mode. Refer to Sec-

tion 8.5.8.1 for more details).

– The Next Buffer Start Address to be stored in

buffer 2 (address 0102h and 0103h) is 8090h

(0090h is the address of buffer 1, and 80h is the

code for extended parallel mode. Refer to Sec-

tion 8.5.8.1 for more details).

Note: To keep some OSDRAM locations free,

configure only those features that you really use

(color palettes, underline palettes and mouse

pointer data), as shown in the two examples.

Byte

Serial Mode

Basic

Parallel Mode

Extended

Parallel Mode

Char or Attrib1

Char1

Char or Attrib2

PaletteAttrib1

Char or Attrib3

Char2

ShapeAttrib1

Char or Attrib4

PaletteAttrib2

Char2

Char or Attrib5

Char3

PaletteAttrib2

Char or Attrib6

PaletteAttrib3

ShapeAttrib2

...

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