Download on-screen display controller mb90092 user`s manual

3.3 Character Display Functions
The pattern background color indicates the character background color that is set for each
character in normal mode. In extended graphic mode, it indicates the line background color that
is set for each line.
A pattern background on the main screen is displayed unless the solid-fill background is
specified. The pattern background of the sprite screen is always displayed.
In normal mode, the pattern background color (character background color) is set in the BG,
BR, and BB bits of Command 1-1 (main screen character control 1). In extended graphic mode,
the pattern background color (line background color) is set in the KG, KR, and KB bits of
Command 2-3 (main screen line control 2). In normal mode, the specification of color or
monochrome for the pattern background color is set in the BC bit (specification for the entire
screen) of Command 10 (color control). In extended graphic mode, it is set in the KC bit
(specification for each line) of Command 2-3 (main screen line control 2).
The pattern background is displayed if AT = 0 or AT = 1 in Command 1-1 (main screen
character control 1) and BK = 0 in Command 10 (color control). The AT bit can be set for each
character.
Figure 3.3-2 shows an example of pattern background display.
Note: If a character dot is set as the rightmost dot (24th dot) or the dot before the rightmost one
(23rd dot) in the horizontal 24-dot character area, the pattern background dot may leave
the character area and be displayed in the adjacent character area on the right.
However, the pattern background never extends beyond the right edge of the character
display screen area (24th dot of the 24th character).
(1) Pattern background 0 display (Font data display)
Command 1-1
:
AT = 0
Command 4
:
P0 = 1
:
P2 = 0
Figure 3.3-2 Example of Pattern Background Display
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