User`s manual

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS

Rev. 1.0

M37281MAH–XXXSP,M37281MFH–XXXSP

M37281MKH–XXXSP,M37281EKSP

(2) OSD RAM (addresses 070016 to 07A716, 080016 to 0FFF16)

The OSD RAM for SPRITE consisting of 3 planes, is assigned to

addresses 070016 to 07A716. Each plane corresponds to each color

pallet selection bit and the color pallet of each dot is determined from

among 8 kinds.

The OSD RAM for character is allocated at addresses 080016 to

0FFF16, and is divided into a display character code specification

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

part for each block. Tables 8.11.5 and 8.11.6 show the contents of

the OSD RAM.

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

write the character code in address 080016, write color code 1 at

082016, and write color code 2 at 084016. The structure of the OSD

RAM is shown in Figure 8.11.23.

Note : For the layer 2 ’s OSD mode block with dot size of 1.5TC ✕ 1/2H and

1.5T

C ✕ 1H, the 3nth (n = 1 to 10) character is skipped as compared

with ordinary block (blocks with dot size of 1T

C ✕ 1/2H, or blocks on the

layer 1). Accordingly, maximum 22 characters are only displayed in 1

block. Blocks with dot size of 1T

C ✕ 1/2H and 1TC ✕ 1H, or blocks on

the layer 1

However, note the following:

• In OSD 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 background, set transparent for background.

• In CDOSD mode

The character is not displayed, and color pallet color specified by bit

3 to 6 of color code 1 can be output in the 22nd’s character area (left

1/3 part).

The RAM data for the 3nth character does not effect the display.

Any character data can be stored here (refer to Figure 8.11.22).