M37207MF Datasheet, PDF (71/122 Pages) Mitsubishi Electric Semiconductor – SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER and ON-SCREEN DISPLAY CONTROLLER

MITSUBISHI MICROCOMPUTERS
M37207MF-XXXSP/FP, M37207M8-XXXSP
M37207EFSP/FP
SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER
and ON-SCREEN DISPLAY CONTROLLER
(12) Raster Coloring Function
An entire screen (raster) can be colored by switching each of the R,
G, and B pins to MUTE output. R, G, B are controlled with the CRT
port control register; I is controlled with the CRT control register 2;
OUT is controlled with the character size register. 15 raster colors
can be obtained.
If the OUT 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 MUTE signal output, a raster
coloring signal is output in the part except a no-raster colored char-
acter (in Figure 66, a character “O”) during 1 horizontal scanning
period. This ensures that character colors do not mix with the raster
color. In this case, MUTE signal is output from the OUT pin.
An example in which a magenta character “I” and a red character “O”
are displayed with blue raster coloring is shown in Figure 66.
“RED”
“BLUE”
A
A'
HSYNC
R
B
OUT
Signals
across
A – A'
Fig. 66. Example of Raster Coloring
CRT Control Register 2
b7 b6 b5 b4 b3 b2 b1 b0
CRT control register 2 (CBR) [Address 0208 16]
B
Name
0 I signal output switch bit
(CBR0)
Functions
0: I signal output
1: MUTE signal output
After reset R W
0
RW
1 I/TIM1 function switch bit 0: I output or MUTE output
0
(CBR1)
1: 1/2 clock ouput of timer 1
2 Nothing is assigned. These bits are write disable bits.
0
to When these bits are read out, the values are indeterminate.
7
RW
R—
Fig. 67. CRT Control Register 2
70