User`s manual

74
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37281MAH–XXXSP,M37281MFH–XXXSP
M37281MKH–XXXSP,M37281EKSP
MITSUBISHI MICROCOMPUTERS
Rev. 1.0
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 “8.11.6 Memory for OSD”).
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:
• 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.
• 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 ✕ 2H or 3TC ✕ 3H during display
period (✽) of another block.
Fig. 8.11.8 Display Position
✽ In the case of OSD mode block: 20 dots in vertical from the vertical
display start position.
✽ In the case of CC or CDOSD mode block: 26 dots in vertical from
the vertical display start position.
HP
VP12, VP22
Block 1
Block 2
(a) Example when each block is separated
VP13, VP23
Block 3
HP
VP11, VP21 = VP12, VP22
Block 1
(b) Example when block 2 overlaps with block 1
(Block 2 is not displayed)
HP
VP11, VP21
VP12, VP22
(c) Example when block 2 overlaps in process of block 1
Block 1
Block 2
Note: VP1i or VP2i (i : 1 to 16) indicates the vertical display start position of display block i.
VP11, VP21