M306V2EEFS datasheet(198/271 Pages) RENESAS

198 / 271 page

Rev.1.40

Oct 06, 2004 page 198 of 269

M306V2ME-XXXFP, M306V2EEFP

(2) OSD RAM (OSD RAM for character, addresses 040016 to 0EFF16)

The OSD RAM for character is allocated at addresses 040016 to 0EFF16, and is divided into a display

character code specification part, color code 1 specification part, and color code 2 specification part

for each block. The number of characters for 1 block (32- or 42-character mode) is selected by bit 1 of

the OSD control register 4. Tables 2.16.3 to 2.16.7 show the address map.

For example, to display 1 character position (the left edge) in block 1, write the character code in

address 040016, write color code 1 at 040116, and write color code 2 at 048016. The structure of the

OSD RAM is shown in Figure 2.16.25.

Note : For blocks of the following dot sizes, the 3nth (n = 1 to 14) character is skipped as compared

with ordinary block.

sIn OSDL mode: all dot size.

sIn OSDS and CDOSD modes of layer 2: 1.5Tc ✕ 1/2H or 1.5Tc ✕ 1H

Accordingly, maximum 22 characters (32-character mode)/28 characters (42-character mode)

are only displayed in 1 block. Blocks with dot size of 1TC ✕ 1/2H and 1TC ✕ 1H, or blocks on the

layer 1. The RAM data for the 3nth character does not effect the display. Any character data can

be stored here. And also, note the following only in 32-character mode. As the character is

displayed in the 28th’s character area in 42-character mode, set ordinarily.

• In OSDS mode

The character is not displayed, and only the left 1/3 part of the 22nd character back

ground is displayed in the 22nd’s character area. When not displaying this back-

ground, set transparent for character background color.

• In OSDL mode

Set a blank character or a character of transparent color to the 22nd character.

• In CDOSD mode

The character is not displayed, and color palette color specified by bits 3 to 6 of color

code 1 can be output in the 22nd’s character area (left 1/3 part).

Figure 2.16.24 RAM data for 3rd character (in 32-character mode)

1 2 3 4 5 6 7 8 9 1011 121314 151617 18 19 202122 23 24252627 2829 3031 32

1 2 3 4 5 6 7 8 9 10 11121314 1516 17 18 19 20 212223 2425 262728 2930 31 32

Display

sequence

RAM

address

order

Display

sequence

RAM

address

order

• 1Tc size block

• 1.5Tc size block

• OSDL block

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