Renesas PROM Programming Adapter PCA7408 Manual do Utilizador descarregar pdf (Página 65)

M37221M4H/M6H/M8H/MAH–XXXSP/FP M37221EASP/FP

Rev.1.00 Oct 01, 2002 page 65 of 110

REJ03B0134-0100Z

8.11.4 Memory for OSD

There are 2 types of memory for OSD: OSD ROM (addresses 1000016

to 11FFF16) used to store character dot data and OSD RAM (ad-

dresses 060016 to 06B716) used to specify the characters and colors

to be displayed.

Fig. 8.11.11 Character Font Data Storing Address

(1) OSD ROM (addresses 1000016 to 11FFF16)

The dot pattern data for OSD characters is stored in the OSD ROM.

To specify the kinds of character font, it is necessary to write the

character code (Table 8.11.3) into the OSD RAM.

The OSD ROM has a capacity of 8K bytes. Since 32 bytes are re-

quired for 1 character data, the ROM can stores up to 256 kinds of

characters.

The OSD ROM space is broadly divided into 2 areas. The [vertical

16 dots] ✕ [horizontal (left side) 8 dots] data of display characters are

stored in addresses 1000016 to 107FF16 and 1100016 to 117FF16 ;

the [vertical 16 dots] ✕ [horizontal (right side) 4 dots] data of display

characters are stored in addresses 1080016 to 10FFF16 and 1180016

to 11FFF16 (refer to Figure 8.11.11). Note however that the high-

order 4 bits in the data to be written to addresses 1080016 to 10FFF16

and 1180016 to 11FFF16 must be set to “1” (by writing data “FX16”).

Data of the character font is specified shown in Figure 8.11.11.

10XX0

+800

11XX0

+800

00000000

00000010

00000101

01001000

00010000

1111001

00100000

00000000

00000101

00000010

01111 000

0000

0100

0010

0000

1111

b7 b0

b7 b0b3

00000

10XXF

+800

11XXF

+800

10XX0

11XX0

10XXF

11XXF

1 2 ... 60 61 62 63 64 65 66 67 68 69 70 ... 111 112

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