ST92185B datasheet(111/178 Pages) STMICROELECTRONICS

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ST92185B - ON SCREEN DISPLAY (OSD)

ON SCREEN DISPLAY (Cont’d)

7.4.6 Display Memory Mapping Examples

The display content is stored in TDSRAM, (2 to 8K

bytes starting at address 8000h). Use register

TDPR R252 (FCh) Page 32 to address the memo-

ry blocks containing the display data. Two 4-bit ad-

dress pointers (bits PG and HS) must be given that

point to separate blocks containing the display

page and the header/status rows.

Alternatively, the PG and HS pointers can be writ-

ten to the TDPPR R246 Page 33 and TDHSPR

R247 Page 33 registers.

7.4.6.1 Building a Serial Mode Full Page 40-

Char Display

Page Location:

The 1 Kbyte block of page content is stored in the

TDSRAM location pointed to by the PG3..PG0

bits.

Header & Status Rows Location:

The 0.5 Kbyte block containing the Header, Status

Row 0 and Status Row 1 is pointed to by the

HS3..HS0 bits.

Row Scrolling Buffer Location:

The scrolling buffer corresponds to the 40 bytes

following the Row 23 when the scrolling feature is

used.

Figure 69. Serial Mode (40 Characters) - Page Mapping

Figure 70. Serial Mode (40 Characters) - Header and Status Mapping

1K TDSRAM

Row 1

Row 23

Scrolling Buffer

Free Space

Resolution 1K bytes

Block

Number(1K)

TDSRAM

Address (hex)

TDPR

Value (hex)

PG3..PG0

8000

8400

8800

8C00

9000

9400

9800

9C00

0.5K TDSRAM

Header

Status Row 0

Free Space

Resolution 0.5K bytes

Block Number

(0.5K)

TDSRAM

Address (hex.)

TDPR Value

(Hex.) HS3..HS0

8000

8200

8400

8600

8800

8A00

8C00

8E00

9000

9200

9400

9600

9800

9A00

9C00

9E00

Status Row 1

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