MITSUBISHI MICROCOMPUTERS
M37274EFSP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER
and ON-SCREEN DISPLAY CONTROLLER
(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 102, a character “1”) and the character background output
during 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 101, the
example of raster coloring is shown in Figure 102.
Raster Color Register
b7 b6 b5b4 b3 b2b1 b0
0 0
Raster color register (RC) [Address 021816
]
Functions
0 : No output
1 : Output
After reset R
W
B
0
Name
0
R W
R W
R W
Raster color R
control bit (RC0)
Raster color G
control bit (RC1)
0 : No output
1 : Output
0
0
1
2
Raster color B
control bit (RC2)
0 : No output
1 : Output
Fix these bits to “0.”
3, 4
5
0
0
R —
R W
Raster color OUT1
control bit (RC5)
0 : No output
1 : Output
6
Raster color OUT2
control bit (RC6)
0 : No output
1 : Output
0
0
R W
R W
7
OSD interrupt source
selection bit (RC7)
0 : Interrupt occurs at end of
OSD or EXOSD block
display
1 : Interrupt occurs at end of
CC mode block display
Fig. 101. Raster Color Register
99
RENESAS [ RENESAS TECHNOLOGY CORP ]
