81
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
M37274MA-XXXSP
PRELIMINARY
Notice:
This
is not
a final
specification.
Some
paramentic
limits
are
subject
to change.
MITSUBISHI MICROCOMPUTERS
(16) Raster Coloring Function
An entire screen (raster) can be colored by setting the bits 6 to 0 of
the raster color register. Since each of the R, G, B, OUT1, and OUT2
pins can be switched to raster coloring output, 7 raster colors can be
obtained.
If the OUT1 pin has been set to raster coloring output, a raster color-
ing signal is always output during 1 horizontal scanning period. This
setting is necessary for erasing a background TV image.
If the R, G, and B pins have been set to output, a raster coloring
signal is output in the part except a no-raster colored character (in
Figure 90, a character “1”) and the character background output dur-
ing 1 horizontal scanning period. This ensures that the character color/
the character background color is not mixed with the raster color.
The structure of the raster color register is shown in Figure 89, the
example of raster coloring is shown in Figure 90.
Fig. 89. Raster Color Register
Fig. 90. Example of Raster Coloring
7
Raster color register
(RC : address 021816)
Raster color R control bit
0 : No output
1 : Output
Raster color G control bit
0 : No output
1 : Output
Raster color B control bit
0 : No output
1 : Output
Raster color I1 control bit
0 : No output
1 : Output
Raster color OUT2 control bit
0 : No output
1 : Output
OSD interrupt source
selection bit
0 : Interrupt occurs at end
of OSD or EXOSD block
display
1 : Interrupt occurs at end
of CC mode block display
HSYNC
A'
A
OUT1
R
G
B
: Character color “RED” (R)
: Border color “GREEN” (G)
: Background color “MAGENTA” (R and B)
: Raster color “BLUE” (B and OUT1)
Signals
across
A-A'
0