M37281EKSP Datasheet, PDF(74/172 Page) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

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M37281EKSP Datasheet, PDF (74/172 Pages) Renesas Technology Corp – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER and ON-SCREEN DISPLAY CONTROLLER

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M37281MAHâXXXSP,M37281MFHâXXXSP,M37281MKHâXXXSP, M37281EKSP

8.11.2 Display Position

The display start positions of characters are specified by a block.

There are 16 blocks, blocks 1 to 16. Up to 32 characters can be

displayed in each block (refer to â8.11.6 Memory for OSDâ).

The display position of each block can be set in both horizontal and

vertical directions by software.

The display start position in the horizontal direction can be selected

for all blocks in common from 256-step display positions in units of 4

TOSC (TOSC = OSD oscillation cycle).

The display start position in the vertical direction for each block can

be selected from 1024-step display positions in units of 1 TH ( TH =

HSYNC cycle).

Blocks are displayed in conformance with the following rules:

â¢ When the display start position is overlapped with another block

(Figure 8.11.8 (b)), a lower block number (1 to 16) is displayed on

the front.

â¢ When another block display position appears while one block is

displayed (Figure 8.11.8 (c)), the block with a larger set value as

the vertical display start position is displayed. However, do not dis-

play block with the dot size of 2TC â 2H or 3TC â 3H during display

period (â½) of another block.

â½ In the case of OSD mode block: 20 dots in vertical from the vertical

display start position.

â½ In the case of CC or CDOSD mode block: 26 dots in vertical from

the vertical display start position.

HP

VP11, VP21

VP12, VP22

VP13, VP23

(a) Example when each block is separated

Block 1

Block 2

Block 3

HP

VP11, VP21 = VP12, VP22

(b) Example when block 2 overlaps with block 1

Block 1

(Block 2 is not displayed)

HP

VP11, VP21

VP12, VP22

Block 1

Block 2

(c) Example when block 2 overlaps in process of block 1

Note: VP1i or VP2i (i : 1 to 16) indicates the vertical display start position of display block i.

Fig. 8.11.8 Display Position

Rev.1.01 2003.07.16 page 74 of 170

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